scons: Switch from the print statement to the print function.

Starting with version 3, scons imposes using the print function instead
of the print statement in code it processes. To get things building
again, this change moves all python code within gem5 to use the
function version. Another change by another author separately made this
same change to the site_tools and site_init.py files.

Change-Id: I2de7dc3b1be756baad6f60574c47c8b7e80ea3b0
Reviewed-on: https://gem5-review.googlesource.com/8761
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Gabe Black <gabeblack@google.com>

33 files changed, 386 insertions, 318 deletions

diff --git a/SConstruct b/SConstruct
index df647e725..0bb0f69a2 100755
--- a/SConstruct
+++ b/SConstruct
@@ -78,6 +78,8 @@
 #
 ###################################################
 
+from __future__ import print_function
+
 # Global Python includes
 import itertools
 import os
@@ -164,7 +166,7 @@ AddLocalOption('--with-asan', dest='with_asan', action='store_true',
                help='Build with Address Sanitizer if available')
 
 if GetOption('no_lto') and GetOption('force_lto'):
-    print '--no-lto and --force-lto are mutually exclusive'
+    print('--no-lto and --force-lto are mutually exclusive')
     Exit(1)
 
 ########################################################################
@@ -183,7 +185,7 @@ main_dict_keys = main.Dictionary().keys()
 
 # Check that we have a C/C++ compiler
 if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys):
-    print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
+    print("No C++ compiler installed (package g++ on Ubuntu and RedHat)")
     Exit(1)
 
 ###################################################
@@ -230,15 +232,15 @@ for t in BUILD_TARGETS:
     try:
         build_top = rfind(path_dirs, 'build', -2)
     except:
-        print "Error: no non-leaf 'build' dir found on target path", t
+        print("Error: no non-leaf 'build' dir found on target path", t)
         Exit(1)
     this_build_root = joinpath('/',*path_dirs[:build_top+1])
     if not build_root:
         build_root = this_build_root
     else:
         if this_build_root != build_root:
-            print "Error: build targets not under same build root\n"\
-                  "  %s\n  %s" % (build_root, this_build_root)
+            print("Error: build targets not under same build root\n"
+                  "  %s\n  %s" % (build_root, this_build_root))
             Exit(1)
     variant_path = joinpath('/',*path_dirs[:build_top+2])
     if variant_path not in variant_paths:
@@ -335,7 +337,7 @@ CXX_V = readCommand([main['CXX'],'-V'], exception=False)
 main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
 main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0
 if main['GCC'] + main['CLANG'] > 1:
-    print 'Error: How can we have two at the same time?'
+    print('Error: How can we have two at the same time?')
     Exit(1)
 
 # Set up default C++ compiler flags
@@ -367,22 +369,22 @@ if main['GCC'] or main['CLANG']:
                          '-Wno-error=deprecated',
                         ])
 else:
-    print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
-    print "Don't know what compiler options to use for your compiler."
-    print termcap.Yellow + '       compiler:' + termcap.Normal, main['CXX']
-    print termcap.Yellow + '       version:' + termcap.Normal,
+    print(termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, end=' ')
+    print("Don't know what compiler options to use for your compiler.")
+    print(termcap.Yellow + '       compiler:' + termcap.Normal, main['CXX'])
+    print(termcap.Yellow + '       version:' + termcap.Normal, end = ' ')
     if not CXX_version:
-        print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
-               termcap.Normal
+        print(termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +
+              termcap.Normal)
     else:
-        print CXX_version.replace('\n', '<nl>')
-    print "       If you're trying to use a compiler other than GCC"
-    print "       or clang, there appears to be something wrong with your"
-    print "       environment."
-    print "       "
-    print "       If you are trying to use a compiler other than those listed"
-    print "       above you will need to ease fix SConstruct and "
-    print "       src/SConscript to support that compiler."
+        print(CXX_version.replace('\n', '<nl>'))
+    print("       If you're trying to use a compiler other than GCC")
+    print("       or clang, there appears to be something wrong with your")
+    print("       environment.")
+    print("       ")
+    print("       If you are trying to use a compiler other than those listed")
+    print("       above you will need to ease fix SConstruct and ")
+    print("       src/SConscript to support that compiler.")
     Exit(1)
 
 if main['GCC']:
@@ -391,8 +393,8 @@ if main['GCC']:
     # http://gcc.gnu.org/projects/cxx0x.html for details.
     gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
     if compareVersions(gcc_version, "4.8") < 0:
-        print 'Error: gcc version 4.8 or newer required.'
-        print '       Installed version:', gcc_version
+        print('Error: gcc version 4.8 or newer required.')
+        print('       Installed version: ', gcc_version)
         Exit(1)
 
     main['GCC_VERSION'] = gcc_version
@@ -433,31 +435,31 @@ if main['GCC']:
     as_version = as_version_raw[-1].split('-')[0] if as_version_raw else None
 
     if not as_version or compareVersions(as_version, "2.23") < 0:
-        print termcap.Yellow + termcap.Bold + \
-            'Warning: This combination of gcc and binutils have' + \
-            ' known incompatibilities.\n' + \
-            '         If you encounter build problems, please update ' + \
-            'binutils to 2.23.' + \
-            termcap.Normal
+        print(termcap.Yellow + termcap.Bold +
+            'Warning: This combination of gcc and binutils have' +
+            ' known incompatibilities.\n' +
+            '         If you encounter build problems, please update ' +
+            'binutils to 2.23.' +
+            termcap.Normal)
 
     # Make sure we warn if the user has requested to compile with the
     # Undefined Benahvior Sanitizer and this version of gcc does not
     # support it.
     if GetOption('with_ubsan') and \
             compareVersions(gcc_version, '4.9') < 0:
-        print termcap.Yellow + termcap.Bold + \
-            'Warning: UBSan is only supported using gcc 4.9 and later.' + \
-            termcap.Normal
+        print(termcap.Yellow + termcap.Bold +
+            'Warning: UBSan is only supported using gcc 4.9 and later.' +
+            termcap.Normal)
 
     disable_lto = GetOption('no_lto')
     if not disable_lto and main.get('BROKEN_INCREMENTAL_LTO', False) and \
             not GetOption('force_lto'):
-        print termcap.Yellow + termcap.Bold + \
-            'Warning: Your compiler doesn\'t support incremental linking' + \
-            ' and lto at the same time, so lto is being disabled. To force' + \
-            ' lto on anyway, use the --force-lto option. That will disable' + \
-            ' partial linking.' + \
-            termcap.Normal
+        print(termcap.Yellow + termcap.Bold +
+            'Warning: Your compiler doesn\'t support incremental linking' +
+            ' and lto at the same time, so lto is being disabled. To force' +
+            ' lto on anyway, use the --force-lto option. That will disable' +
+            ' partial linking.' +
+            termcap.Normal)
         disable_lto = True
 
     # Add the appropriate Link-Time Optimization (LTO) flags
@@ -508,11 +510,11 @@ elif main['CLANG']:
     if (clang_version_match):
         clang_version = clang_version_match.groups()[0]
         if compareVersions(clang_version, "3.1") < 0:
-            print 'Error: clang version 3.1 or newer required.'
-            print '       Installed version:', clang_version
+            print('Error: clang version 3.1 or newer required.')
+            print('       Installed version:', clang_version)
             Exit(1)
     else:
-        print 'Error: Unable to determine clang version.'
+        print('Error: Unable to determine clang version.')
         Exit(1)
 
     # clang has a few additional warnings that we disable, extraneous
@@ -556,22 +558,22 @@ elif main['CLANG']:
                    LINKFLAGS='-fsanitize=address')
 
 else:
-    print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
-    print "Don't know what compiler options to use for your compiler."
-    print termcap.Yellow + '       compiler:' + termcap.Normal, main['CXX']
-    print termcap.Yellow + '       version:' + termcap.Normal,
+    print(termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, end=' ')
+    print("Don't know what compiler options to use for your compiler.")
+    print(termcap.Yellow + '       compiler:' + termcap.Normal, main['CXX'])
+    print(termcap.Yellow + '       version:' + termcap.Normal, end=' ')
     if not CXX_version:
-        print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
-               termcap.Normal
+        print(termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +
+              termcap.Normal)
     else:
-        print CXX_version.replace('\n', '<nl>')
-    print "       If you're trying to use a compiler other than GCC"
-    print "       or clang, there appears to be something wrong with your"
-    print "       environment."
-    print "       "
-    print "       If you are trying to use a compiler other than those listed"
-    print "       above you will need to ease fix SConstruct and "
-    print "       src/SConscript to support that compiler."
+        print(CXX_version.replace('\n', '<nl>'))
+    print("       If you're trying to use a compiler other than GCC")
+    print("       or clang, there appears to be something wrong with your")
+    print("       environment.")
+    print("       ")
+    print("       If you are trying to use a compiler other than those listed")
+    print("       above you will need to ease fix SConstruct and ")
+    print("       src/SConscript to support that compiler.")
     Exit(1)
 
 # Set up common yacc/bison flags (needed for Ruby)
@@ -597,21 +599,21 @@ protoc_version = readCommand([main['PROTOC'], '--version'],
 
 # First two words should be "libprotoc x.y.z"
 if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc':
-    print termcap.Yellow + termcap.Bold + \
-        'Warning: Protocol buffer compiler (protoc) not found.\n' + \
-        '         Please install protobuf-compiler for tracing support.' + \
-        termcap.Normal
+    print(termcap.Yellow + termcap.Bold +
+        'Warning: Protocol buffer compiler (protoc) not found.\n' +
+        '         Please install protobuf-compiler for tracing support.' +
+        termcap.Normal)
     main['PROTOC'] = False
 else:
     # Based on the availability of the compress stream wrappers,
     # require 2.1.0
     min_protoc_version = '2.1.0'
     if compareVersions(protoc_version[1], min_protoc_version) < 0:
-        print termcap.Yellow + termcap.Bold + \
-            'Warning: protoc version', min_protoc_version, \
-            'or newer required.\n' + \
-            '         Installed version:', protoc_version[1], \
-            termcap.Normal
+        print(termcap.Yellow + termcap.Bold +
+            'Warning: protoc version', min_protoc_version,
+            'or newer required.\n' +
+            '         Installed version:', protoc_version[1],
+            termcap.Normal)
         main['PROTOC'] = False
     else:
         # Attempt to determine the appropriate include path and
@@ -626,9 +628,9 @@ else:
                 # using pkg-config
                 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
             except:
-                print termcap.Yellow + termcap.Bold + \
-                    'Warning: pkg-config could not get protobuf flags.' + \
-                    termcap.Normal
+                print(termcap.Yellow + termcap.Bold +
+                    'Warning: pkg-config could not get protobuf flags.' +
+                    termcap.Normal)
 
 
 # Check for 'timeout' from GNU coreutils. If present, regressions will
@@ -708,7 +710,7 @@ if not conf:
 
 # Cache build files in the supplied directory.
 if main['M5_BUILD_CACHE']:
-    print 'Using build cache located at', main['M5_BUILD_CACHE']
+    print('Using build cache located at', main['M5_BUILD_CACHE'])
     CacheDir(main['M5_BUILD_CACHE'])
 
 main['USE_PYTHON'] = not GetOption('without_python')
@@ -748,27 +750,28 @@ if main['USE_PYTHON']:
 
     # verify that this stuff works
     if not conf.CheckHeader('Python.h', '<>'):
-        print "Error: can't find Python.h header in", py_includes
-        print "Install Python headers (package python-dev on Ubuntu and RedHat)"
+        print("Error: can't find Python.h header in", py_includes)
+        print("Install Python headers (package python-dev on " +
+              "Ubuntu and RedHat)")
         Exit(1)
 
     for lib in py_libs:
         if not conf.CheckLib(lib):
-            print "Error: can't find library %s required by python" % lib
+            print("Error: can't find library %s required by python" % lib)
             Exit(1)
 
 # On Solaris you need to use libsocket for socket ops
 if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
    if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
-       print "Can't find library with socket calls (e.g. accept())"
+       print("Can't find library with socket calls (e.g. accept())")
        Exit(1)
 
 # Check for zlib.  If the check passes, libz will be automatically
 # added to the LIBS environment variable.
 if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
-    print 'Error: did not find needed zlib compression library '\
-          'and/or zlib.h header file.'
-    print '       Please install zlib and try again.'
+    print('Error: did not find needed zlib compression library '
+          'and/or zlib.h header file.')
+    print('       Please install zlib and try again.')
     Exit(1)
 
 # If we have the protobuf compiler, also make sure we have the
@@ -782,10 +785,10 @@ main['HAVE_PROTOBUF'] = main['PROTOC'] and \
 
 # If we have the compiler but not the library, print another warning.
 if main['PROTOC'] and not main['HAVE_PROTOBUF']:
-    print termcap.Yellow + termcap.Bold + \
-        'Warning: did not find protocol buffer library and/or headers.\n' + \
-    '       Please install libprotobuf-dev for tracing support.' + \
-    termcap.Normal
+    print(termcap.Yellow + termcap.Bold +
+        'Warning: did not find protocol buffer library and/or headers.\n' +
+    '       Please install libprotobuf-dev for tracing support.' +
+    termcap.Normal)
 
 # Check for librt.
 have_posix_clock = \
@@ -804,10 +807,10 @@ if not GetOption('without_tcmalloc'):
     elif conf.CheckLib('tcmalloc_minimal'):
         main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
     else:
-        print termcap.Yellow + termcap.Bold + \
-              "You can get a 12% performance improvement by "\
-              "installing tcmalloc (libgoogle-perftools-dev package "\
-              "on Ubuntu or RedHat)." + termcap.Normal
+        print(termcap.Yellow + termcap.Bold +
+              "You can get a 12% performance improvement by "
+              "installing tcmalloc (libgoogle-perftools-dev package "
+              "on Ubuntu or RedHat)." + termcap.Normal)
 
 
 # Detect back trace implementations. The last implementation in the
@@ -826,26 +829,26 @@ elif conf.CheckLibWithHeader('execinfo', 'execinfo.h', 'C',
 
 if backtrace_impls[-1] == "none":
     default_backtrace_impl = "none"
-    print termcap.Yellow + termcap.Bold + \
-        "No suitable back trace implementation found." + \
-        termcap.Normal
+    print(termcap.Yellow + termcap.Bold +
+        "No suitable back trace implementation found." +
+        termcap.Normal)
 
 if not have_posix_clock:
-    print "Can't find library for POSIX clocks."
+    print("Can't find library for POSIX clocks.")
 
 # Check for <fenv.h> (C99 FP environment control)
 have_fenv = conf.CheckHeader('fenv.h', '<>')
 if not have_fenv:
-    print "Warning: Header file <fenv.h> not found."
-    print "         This host has no IEEE FP rounding mode control."
+    print("Warning: Header file <fenv.h> not found.")
+    print("         This host has no IEEE FP rounding mode control.")
 
 # Check for <png.h> (libpng library needed if wanting to dump
 # frame buffer image in png format)
 have_png = conf.CheckHeader('png.h', '<>')
 if not have_png:
-    print "Warning: Header file <png.h> not found."
-    print "         This host has no libpng library."
-    print "         Disabling support for PNG framebuffers."
+    print("Warning: Header file <png.h> not found.")
+    print("         This host has no libpng library.")
+    print("         Disabling support for PNG framebuffers.")
 
 # Check if we should enable KVM-based hardware virtualization. The API
 # we rely on exists since version 2.6.36 of the kernel, but somehow
@@ -853,13 +856,13 @@ if not have_png:
 # the types as a fall back.
 have_kvm = conf.CheckHeader('linux/kvm.h', '<>')
 if not have_kvm:
-    print "Info: Compatible header file <linux/kvm.h> not found, " \
-        "disabling KVM support."
+    print("Info: Compatible header file <linux/kvm.h> not found, "
+          "disabling KVM support.")
 
 # Check if the TUN/TAP driver is available.
 have_tuntap = conf.CheckHeader('linux/if_tun.h', '<>')
 if not have_tuntap:
-    print "Info: Compatible header file <linux/if_tun.h> not found."
+    print("Info: Compatible header file <linux/if_tun.h> not found.")
 
 # x86 needs support for xsave. We test for the structure here since we
 # won't be able to run new tests by the time we know which ISA we're
@@ -873,12 +876,12 @@ def is_isa_kvm_compatible(isa):
         import platform
         host_isa = platform.machine()
     except:
-        print "Warning: Failed to determine host ISA."
+        print("Warning: Failed to determine host ISA.")
         return False
 
     if not have_posix_timers:
-        print "Warning: Can not enable KVM, host seems to lack support " \
-            "for POSIX timers"
+        print("Warning: Can not enable KVM, host seems to lack support "
+              "for POSIX timers")
         return False
 
     if isa == "arm":
@@ -888,7 +891,7 @@ def is_isa_kvm_compatible(isa):
             return False
 
         if not have_kvm_xsave:
-            print "KVM on x86 requires xsave support in kernel headers."
+            print("KVM on x86 requires xsave support in kernel headers.")
             return False
 
         return True
@@ -961,15 +964,15 @@ Export('slicc_includes')
 # Walk the tree and execute all SConsopts scripts that wil add to the
 # above variables
 if GetOption('verbose'):
-    print "Reading SConsopts"
+    print("Reading SConsopts")
 for bdir in [ base_dir ] + extras_dir_list:
     if not isdir(bdir):
-        print "Error: directory '%s' does not exist" % bdir
+        print("Error: directory '%s' does not exist" % bdir)
         Exit(1)
     for root, dirs, files in os.walk(bdir):
         if 'SConsopts' in files:
             if GetOption('verbose'):
-                print "Reading", joinpath(root, 'SConsopts')
+                print("Reading", joinpath(root, 'SConsopts'))
             SConscript(joinpath(root, 'SConsopts'))
 
 all_isa_list.sort()
@@ -1025,7 +1028,7 @@ export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'TARGET_GPU_ISA',
 def build_config_file(target, source, env):
     (variable, value) = [s.get_contents() for s in source]
     f = file(str(target[0]), 'w')
-    print >> f, '#define', variable, value
+    print('#define', variable, value, file=f)
     f.close()
     return None
 
@@ -1107,7 +1110,7 @@ def build_switching_header(target, source, env):
     dp = os.path.relpath(os.path.realpath(dp),
                          os.path.realpath(env['BUILDDIR']))
     with open(path, 'w') as hdr:
-        print >>hdr, '#include "%s/%s/%s"' % (dp, subdir, fp)
+        print('#include "%s/%s/%s"' % (dp, subdir, fp), file=hdr)
 
 switching_header_action = MakeAction(build_switching_header,
                                      Transform('GENERATE'))
@@ -1132,7 +1135,7 @@ main.AddMethod(switching_headers, 'SwitchingHeaders')
 
 for variant_path in variant_paths:
     if not GetOption('silent'):
-        print "Building in", variant_path
+        print("Building in", variant_path)
 
     # Make a copy of the build-root environment to use for this config.
     env = main.Clone()
@@ -1151,7 +1154,7 @@ for variant_path in variant_paths:
     if isfile(current_vars_file):
         sticky_vars.files.append(current_vars_file)
         if not GetOption('silent'):
-            print "Using saved variables file %s" % current_vars_file
+            print("Using saved variables file %s" % current_vars_file)
     elif variant_dir in ext_build_dirs:
         # Things in ext are built without a variant directory.
         continue
@@ -1177,12 +1180,12 @@ for variant_path in variant_paths:
         if existing_files:
             default_vars_file = existing_files[0]
             sticky_vars.files.append(default_vars_file)
-            print "Variables file %s not found,\n  using defaults in %s" \
-                  % (current_vars_file, default_vars_file)
+            print("Variables file %s not found,\n  using defaults in %s"
+                  % (current_vars_file, default_vars_file))
         else:
-            print "Error: cannot find variables file %s or " \
-                  "default file(s) %s" \
-                  % (current_vars_file, ' or '.join(default_vars_files))
+            print("Error: cannot find variables file %s or "
+                  "default file(s) %s"
+                  % (current_vars_file, ' or '.join(default_vars_files)))
             Exit(1)
 
     # Apply current variable settings to env
@@ -1195,17 +1198,18 @@ for variant_path in variant_paths:
     # Process variable settings.
 
     if not have_fenv and env['USE_FENV']:
-        print "Warning: <fenv.h> not available; " \
-              "forcing USE_FENV to False in", variant_dir + "."
+        print("Warning: <fenv.h> not available; "
+              "forcing USE_FENV to False in", variant_dir + ".")
         env['USE_FENV'] = False
 
     if not env['USE_FENV']:
-        print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
-        print "         FP results may deviate slightly from other platforms."
+        print("Warning: No IEEE FP rounding mode control in",
+              variant_dir + ".")
+        print("         FP results may deviate slightly from other platforms.")
 
     if not have_png and env['USE_PNG']:
-        print "Warning: <png.h> not available; " \
-              "forcing USE_PNG to False in", variant_dir + "."
+        print("Warning: <png.h> not available; "
+              "forcing USE_PNG to False in", variant_dir + ".")
         env['USE_PNG'] = False
 
     if env['USE_PNG']:
@@ -1216,16 +1220,17 @@ for variant_path in variant_paths:
 
     if env['USE_KVM']:
         if not have_kvm:
-            print "Warning: Can not enable KVM, host seems to lack KVM support"
+            print("Warning: Can not enable KVM, host seems to "
+                  "lack KVM support")
             env['USE_KVM'] = False
         elif not is_isa_kvm_compatible(env['TARGET_ISA']):
-            print "Info: KVM support disabled due to unsupported host and " \
-                "target ISA combination"
+            print("Info: KVM support disabled due to unsupported host and "
+                  "target ISA combination")
             env['USE_KVM'] = False
 
     if env['USE_TUNTAP']:
         if not have_tuntap:
-            print "Warning: Can't connect EtherTap with a tap device."
+            print("Warning: Can't connect EtherTap with a tap device.")
             env['USE_TUNTAP'] = False
 
     if env['BUILD_GPU']:
@@ -1234,9 +1239,9 @@ for variant_path in variant_paths:
     # Warn about missing optional functionality
     if env['USE_KVM']:
         if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']:
-            print "Warning: perf_event headers lack support for the " \
-                "exclude_host attribute. KVM instruction counts will " \
-                "be inaccurate."
+            print("Warning: perf_event headers lack support for the "
+                  "exclude_host attribute. KVM instruction counts will "
+                  "be inaccurate.")
 
     # Save sticky variable settings back to current variables file
     sticky_vars.Save(current_vars_file, env)
diff --git a/ext/libelf/SConscript b/ext/libelf/SConscript
index 85820acb3..45f809da9 100644
--- a/ext/libelf/SConscript
+++ b/ext/libelf/SConscript
@@ -28,6 +28,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import os, subprocess
 
 Import('main')
@@ -114,8 +116,8 @@ if m4env.Detect('gm4'):
 # Check that m4 is available
 import SCons.Tool.m4
 if not SCons.Tool.m4.exists(m4env):
-   print "Error: Can't find version of M4 macro processor.  " + \
-         "Please install M4 and try again."
+   print("Error: Can't find version of M4 macro processor.  " +
+         "Please install M4 and try again.")
    Exit(1)
 
 m4env.Append(M4FLAGS=['-DSRCDIR=%s' % Dir('.').path])
diff --git a/ext/systemc/SConscript b/ext/systemc/SConscript
index c2e67ae1c..cb0c61db4 100644
--- a/ext/systemc/SConscript
+++ b/ext/systemc/SConscript
@@ -23,6 +23,8 @@
 # Authors: Christian Menard
 #          Matthias Jung
 
+from __future__ import print_function
+
 import os
 from m5.util.terminal import get_termcap
 
@@ -57,8 +59,8 @@ elif conf.CheckDeclaration('__x86_64__'):
     arch = 'x86_64'
 else:
     termcap = get_termcap(GetOption('use_colors'))
-    print termcap.Yellow + termcap.Bold + \
-          "Warning: Unrecognized architecture for systemc." + termcap.Normal
+    print(termcap.Yellow + termcap.Bold +
+          "Warning: Unrecognized architecture for systemc." + termcap.Normal)
 
 conf.Finish()
 
diff --git a/ext/systemc/src/sysc/kernel/SConscript.sc b/ext/systemc/src/sysc/kernel/SConscript.sc
index 0db22a6ad..ac79c2fb5 100644
--- a/ext/systemc/src/sysc/kernel/SConscript.sc
+++ b/ext/systemc/src/sysc/kernel/SConscript.sc
@@ -23,6 +23,8 @@
 # Authors: Christian Menard
 #          Matthias Jung
 
+from __future__ import print_function
+
 Import('systemc', 'SystemCSource')
 
 SystemCSource(
@@ -63,5 +65,5 @@ elif coroutine_lib == 'pthreads':
 elif coroutine_lib == 'fiber':
     SystemCSource('sc_cor_fiber.cpp')
 else:
-    print 'Unrecognized threading implementation \'%s\'' % coroutine_lib
+    print('Unrecognized threading implementation \'%s\'' % coroutine_lib)
     Exit(1)
diff --git a/ext/systemc/src/sysc/qt/SConscript.sc b/ext/systemc/src/sysc/qt/SConscript.sc
index 5ffb0d3aa..c2e8baf8e 100644
--- a/ext/systemc/src/sysc/qt/SConscript.sc
+++ b/ext/systemc/src/sysc/qt/SConscript.sc
@@ -23,6 +23,8 @@
 # Authors: Christian Menard
 #          Matthias Jung
 
+from __future__ import print_function
+
 import os
 
 Import('systemc', 'SystemCSource')
@@ -32,11 +34,11 @@ if systemc['COROUTINE_LIB'] == 'qt':
 
     qt_arch = systemc.get('QT_ARCH', None)
     if not qt_arch:
-        print 'No architecture selected for the QT coroutine library.'
+        print('No architecture selected for the QT coroutine library.')
         Exit(1)
 
     if qt_arch in ('i386', 'iX86_64'):
         SystemCSource(os.path.join('md', qt_arch + '.s'))
     else:
-        print 'Don\'t know what to do for QT arch %s.' % qt_arch
+        print('Don\'t know what to do for QT arch %s.' % qt_arch)
         Exit(1)
diff --git a/src/SConscript b/src/SConscript
index 1c53160d2..339059dfb 100755
--- a/src/SConscript
+++ b/src/SConscript
@@ -28,6 +28,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import array
 import bisect
 import functools
@@ -831,7 +833,7 @@ if env['HAVE_PROTOBUF']:
         # Add the C++ source file
         Source(proto.cc_file, tags=proto.tags)
 elif ProtoBuf.all:
-    print 'Got protobuf to build, but lacks support!'
+    print('Got protobuf to build, but lacks support!')
     Exit(1)
 
 #
@@ -1166,7 +1168,7 @@ elif env['CLANG']:
     for target in ['opt', 'fast', 'prof', 'perf']:
         ccflags[target] += ['-O3']
 else:
-    print 'Unknown compiler, please fix compiler options'
+    print('Unknown compiler, please fix compiler options')
     Exit(1)
 
 
diff --git a/src/arch/hsail/gen.py b/src/arch/hsail/gen.py
index 515d7ed77..bb6012112 100755
--- a/src/arch/hsail/gen.py
+++ b/src/arch/hsail/gen.py
@@ -35,12 +35,14 @@
 #  Author: Steve Reinhardt
 #
 
+from __future__ import print_function
+
 import sys, re
 
 from m5.util import code_formatter
 
 if len(sys.argv) != 4:
-    print "Error: need 3 args (file names)"
+    print("Error: need 3 args (file names)")
     sys.exit(0)
 
 header_code = code_formatter()
diff --git a/src/arch/isa_parser.py b/src/arch/isa_parser.py
index fe95d06bf..681734985 100755
--- a/src/arch/isa_parser.py
+++ b/src/arch/isa_parser.py
@@ -39,7 +39,7 @@
 #
 # Authors: Steve Reinhardt
 
-from __future__ import with_statement
+from __future__ import with_statement, print_function
 import os
 import sys
 import re
@@ -1537,11 +1537,11 @@ class ISAParser(Grammar):
         # select the different chunks. If no 'split' directives are used,
         # the cpp emissions have no effect.
         if re.search('-ns.cc.inc$', filename):
-            print >>f, '#if !defined(__SPLIT) || (__SPLIT == 1)'
+            print('#if !defined(__SPLIT) || (__SPLIT == 1)', file=f)
             self.splits[f] = 1
         # ensure requisite #include's
         elif filename == 'decoder-g.hh.inc':
-            print >>f, '#include "base/bitfield.hh"'
+            print('#include "base/bitfield.hh"', file=f)
 
         return f
 
@@ -1596,11 +1596,11 @@ class ISAParser(Grammar):
 
                 fn = 'decoder-ns.cc.inc'
                 assert(fn in self.files)
-                print >>f, 'namespace %s {' % self.namespace
+                print('namespace %s {' % self.namespace, file=f)
                 if splits > 1:
-                    print >>f, '#define __SPLIT %u' % i
-                print >>f, '#include "%s"' % fn
-                print >>f, '}'
+                    print('#define __SPLIT %u' % i, file=f)
+                print('#include "%s"' % fn, file=f)
+                print('}', file=f)
 
         # instruction execution
         splits = self.splits[self.get_file('exec')]
@@ -1617,11 +1617,11 @@ class ISAParser(Grammar):
 
                 fn = 'exec-ns.cc.inc'
                 assert(fn in self.files)
-                print >>f, 'namespace %s {' % self.namespace
+                print('namespace %s {' % self.namespace, file=f)
                 if splits > 1:
-                    print >>f, '#define __SPLIT %u' % i
-                print >>f, '#include "%s"' % fn
-                print >>f, '}'
+                    print('#define __SPLIT %u' % i, file=f)
+                print('#include "%s"' % fn, file=f)
+                print('}', file=f)
 
         # max_inst_regs.hh
         self.update('max_inst_regs.hh',
@@ -2019,7 +2019,7 @@ del wrap
     def p_def_template(self, t):
         'def_template : DEF TEMPLATE ID CODELIT SEMI'
         if t[3] in self.templateMap:
-            print "warning: template %s already defined" % t[3]
+            print("warning: template %s already defined" % t[3])
         self.templateMap[t[3]] = Template(self, t[4])
 
     # An instruction format definition looks like
@@ -2604,9 +2604,9 @@ StaticInstPtr
         try:
             self._parse_isa_desc(*args, **kwargs)
         except ISAParserError, e:
-            print backtrace(self.fileNameStack)
-            print "At %s:" % e.lineno
-            print e
+            print(backtrace(self.fileNameStack))
+            print("At %s:" % e.lineno)
+            print(e)
             sys.exit(1)
 
 # Called as script: get args from command line.
diff --git a/src/arch/micro_asm.py b/src/arch/micro_asm.py
index 4e5400cef..263e73afd 100644
--- a/src/arch/micro_asm.py
+++ b/src/arch/micro_asm.py
@@ -26,6 +26,8 @@
 #
 # Authors: Gabe Black
 
+from __future__ import print_function
+
 import os
 import sys
 import re
@@ -117,9 +119,9 @@ class Directive(Statement):
 ##########################################################################
 
 def print_error(message):
-    print
-    print "*** %s" % message
-    print
+    print()
+    print("*** %s" % message)
+    print()
 
 def handle_statement(parser, container, statement):
     if statement.is_microop:
@@ -153,7 +155,7 @@ def handle_statement(parser, container, statement):
                     statement.params, {}, parser.symbols)
         except:
             print_error("Error executing directive.")
-            print container.directives
+            print(container.directives)
             raise
     else:
         raise Exception, "Didn't recognize the type of statement", statement
diff --git a/src/arch/micro_asm_test.py b/src/arch/micro_asm_test.py
index b074ecb58..e5755f717 100755
--- a/src/arch/micro_asm_test.py
+++ b/src/arch/micro_asm_test.py
@@ -26,6 +26,8 @@
 #
 # Authors: Gabe Black
 
+from __future__ import print_function
+
 from micro_asm import MicroAssembler, Combinational_Macroop, Rom_Macroop, Rom
 
 class Bah(object):
@@ -58,7 +60,7 @@ class TestMacroop(Combinational_Macroop):
     def untweak(self):
         microops["bah"] = Bah
     def print_debug(self, message):
-        print message
+        print(message)
 
     def __init__(self, name):
         super(TestMacroop, self).__init__(name)
diff --git a/src/cpu/BaseCPU.py b/src/cpu/BaseCPU.py
index 096aa635e..e02d36724 100644
--- a/src/cpu/BaseCPU.py
+++ b/src/cpu/BaseCPU.py
@@ -42,6 +42,8 @@
 #          Andreas Hansson
 #          Glenn Bergmans
 
+from __future__ import print_function
+
 import sys
 
 from m5.SimObject import *
@@ -200,8 +202,8 @@ class BaseCPU(MemObject):
                 [], "Interrupt Controller")
         isa = VectorParam.RiscvISA([], "ISA instance")
     else:
-        print "Don't know what TLB to use for ISA %s" % \
-            buildEnv['TARGET_ISA']
+        print("Don't know what TLB to use for ISA %s" %
+              buildEnv['TARGET_ISA'])
         sys.exit(1)
 
     max_insts_all_threads = Param.Counter(0,
@@ -260,8 +262,8 @@ class BaseCPU(MemObject):
             self.interrupts = \
                 [RiscvInterrupts() for i in xrange(self.numThreads)]
         else:
-            print "Don't know what Interrupt Controller to use for ISA %s" % \
-                buildEnv['TARGET_ISA']
+            print("Don't know what Interrupt Controller to use for ISA %s" %
+                  buildEnv['TARGET_ISA'])
             sys.exit(1)
 
     def connectCachedPorts(self, bus):
diff --git a/src/cpu/minor/MinorCPU.py b/src/cpu/minor/MinorCPU.py
index 5954f7b1e..87a30497c 100644
--- a/src/cpu/minor/MinorCPU.py
+++ b/src/cpu/minor/MinorCPU.py
@@ -40,6 +40,8 @@
 #          Nathan Binkert
 #          Andrew Bardsley
 
+from __future__ import print_function
+
 from m5.defines import buildEnv
 from m5.params import *
 from m5.proxy import *
@@ -275,5 +277,5 @@ class MinorCPU(BaseCPU):
         numThreads = Parent.numThreads), "Branch Predictor")
 
     def addCheckerCpu(self):
-        print "Checker not yet supported by MinorCPU"
+        print("Checker not yet supported by MinorCPU")
         exit(1)
diff --git a/src/cpu/o3/O3CPU.py b/src/cpu/o3/O3CPU.py
index 8507ab6ff..b8152f663 100644
--- a/src/cpu/o3/O3CPU.py
+++ b/src/cpu/o3/O3CPU.py
@@ -38,6 +38,8 @@
 #
 # Authors: Kevin Lim
 
+from __future__ import print_function
+
 from m5.defines import buildEnv
 from m5.params import *
 from m5.proxy import *
@@ -173,5 +175,5 @@ class DerivO3CPU(BaseCPU):
             self.checker.cpu_id = self.cpu_id
 
         else:
-            print "ERROR: Checker only supported under ARM ISA!"
+            print("ERROR: Checker only supported under ARM ISA!")
             exit(1)
diff --git a/src/cpu/simple/BaseSimpleCPU.py b/src/cpu/simple/BaseSimpleCPU.py
index 7298724ea..b40458482 100644
--- a/src/cpu/simple/BaseSimpleCPU.py
+++ b/src/cpu/simple/BaseSimpleCPU.py
@@ -26,6 +26,8 @@
 #
 # Authors: Gabe Black
 
+from __future__ import print_function
+
 from m5.defines import buildEnv
 from m5.params import *
 from BaseCPU import BaseCPU
@@ -45,7 +47,7 @@ class BaseSimpleCPU(BaseCPU):
             self.checker.itb = ArmTLB(size = self.itb.size)
             self.checker.dtb = ArmTLB(size = self.dtb.size)
         else:
-            print "ERROR: Checker only supported under ARM ISA!"
+            print("ERROR: Checker only supported under ARM ISA!")
             exit(1)
 
     branchPred = Param.BranchPredictor(NULL, "Branch Predictor")
diff --git a/src/mem/ruby/SConscript b/src/mem/ruby/SConscript
index 5cae880bd..64e798fd5 100644
--- a/src/mem/ruby/SConscript
+++ b/src/mem/ruby/SConscript
@@ -28,6 +28,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import os
 import sys
 
@@ -101,7 +103,7 @@ generated_dir = Dir('../protocol')
 def MakeIncludeAction(target, source, env):
     f = file(str(target[0]), 'w')
     for s in source:
-        print >>f, '#include "%s"' % str(s.abspath)
+        print('#include "%s"' % str(s.abspath), file=f)
     f.close()
 
 def MakeInclude(source):
diff --git a/src/mem/slicc/main.py b/src/mem/slicc/main.py
index 0b528d805..05a5cdb97 100644
--- a/src/mem/slicc/main.py
+++ b/src/mem/slicc/main.py
@@ -25,6 +25,8 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+from __future__ import print_function
+
 import os
 import sys
 
@@ -45,7 +47,7 @@ def eprint(format, *args):
     if args:
         format = format % args
 
-    print >>sys.stderr, format
+    print(format, file=sys.stderr)
 
 def main(args=None):
     import optparse
@@ -79,7 +81,7 @@ def main(args=None):
 
     if opts.print_files:
         for i in sorted(slicc.files()):
-            print '    %s' % i
+            print('    %s' % i)
     else:
         output("Processing AST...")
         slicc.process()
diff --git a/src/mem/slicc/util.py b/src/mem/slicc/util.py
index 83badf46d..3a0cf5f35 100644
--- a/src/mem/slicc/util.py
+++ b/src/mem/slicc/util.py
@@ -24,6 +24,8 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+from __future__ import print_function
+
 import os
 import sys
 
@@ -66,7 +68,7 @@ class Location(object):
         if args:
             message = message % args
         #raise Exception, "%s: Warning: %s" % (self, message)
-        print >>sys.stderr, "%s: Warning: %s" % (self, message)
+        print("%s: Warning: %s" % (self, message), file=sys.stderr)
 
     def error(self, message, *args):
         if args:
diff --git a/src/python/m5/SimObject.py b/src/python/m5/SimObject.py
index 919c0e852..6e61961bd 100644
--- a/src/python/m5/SimObject.py
+++ b/src/python/m5/SimObject.py
@@ -43,6 +43,8 @@
 #          Andreas Hansson
 #          Andreas Sandberg
 
+from __future__ import print_function
+
 import sys
 from types import FunctionType, MethodType, ModuleType
 from functools import wraps
@@ -768,8 +770,8 @@ module_init(py::module &m_internal)
         try:
             ptypes = [p.ptype for p in params]
         except:
-            print cls, p, p.ptype_str
-            print params
+            print(cls, p, p.ptype_str)
+            print(params)
             raise
 
         class_path = cls._value_dict['cxx_class'].split('::')
@@ -962,7 +964,7 @@ class SimObject(object):
     def enumerateParams(self, flags_dict = {},
                         cmd_line_str = "", access_str = ""):
         if hasattr(self, "_paramEnumed"):
-            print "Cycle detected enumerating params"
+            print("Cycle detected enumerating params")
         else:
             self._paramEnumed = True
             # Scan the children first to pick up all the objects in this SimObj
@@ -1334,8 +1336,8 @@ class SimObject(object):
                 try:
                     value = value.unproxy(self)
                 except:
-                    print "Error in unproxying param '%s' of %s" % \
-                          (param, self.path())
+                    print("Error in unproxying param '%s' of %s" %
+                          (param, self.path()))
                     raise
                 setattr(self, param, value)
 
@@ -1349,30 +1351,31 @@ class SimObject(object):
                 port.unproxy(self)
 
     def print_ini(self, ini_file):
-        print >>ini_file, '[' + self.path() + ']'       # .ini section header
+        print('[' + self.path() + ']', file=ini_file)    # .ini section header
 
         instanceDict[self.path()] = self
 
         if hasattr(self, 'type'):
-            print >>ini_file, 'type=%s' % self.type
+            print('type=%s' % self.type, file=ini_file)
 
         if len(self._children.keys()):
-            print >>ini_file, 'children=%s' % \
-                  ' '.join(self._children[n].get_name() \
-                  for n in sorted(self._children.keys()))
+            print('children=%s' %
+                  ' '.join(self._children[n].get_name()
+                           for n in sorted(self._children.keys())),
+                  file=ini_file)
 
         for param in sorted(self._params.keys()):
             value = self._values.get(param)
             if value != None:
-                print >>ini_file, '%s=%s' % (param,
-                                             self._values[param].ini_str())
+                print('%s=%s' % (param, self._values[param].ini_str()),
+                      file=ini_file)
 
         for port_name in sorted(self._ports.keys()):
             port = self._port_refs.get(port_name, None)
             if port != None:
-                print >>ini_file, '%s=%s' % (port_name, port.ini_str())
+                print('%s=%s' % (port_name, port.ini_str()), file=ini_file)
 
-        print >>ini_file        # blank line between objects
+        print(file=ini_file)        # blank line between objects
 
     # generate a tree of dictionaries expressing all the parameters in the
     # instantiated system for use by scripts that want to do power, thermal
diff --git a/src/python/m5/debug.py b/src/python/m5/debug.py
index 839c32d98..f7e34a728 100644
--- a/src/python/m5/debug.py
+++ b/src/python/m5/debug.py
@@ -26,6 +26,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 from UserDict import DictMixin
 
 import _m5.debug
@@ -34,25 +36,25 @@ from _m5.debug import schedBreak, setRemoteGDBPort
 from m5.util import printList
 
 def help():
-    print "Base Flags:"
+    print("Base Flags:")
     for name in sorted(flags):
         if name == 'All':
             continue
         flag = flags[name]
         children = [c for c in flag.kids() ]
         if not children:
-            print "    %s: %s" % (name, flag.desc())
-    print
-    print "Compound Flags:"
+            print("    %s: %s" % (name, flag.desc()))
+    print()
+    print("Compound Flags:")
     for name in sorted(flags):
         if name == 'All':
             continue
         flag = flags[name]
         children = [c for c in flag.kids() ]
         if children:
-            print "    %s: %s" % (name, flag.desc())
+            print("    %s: %s" % (name, flag.desc()))
             printList([ c.name() for c in children ], indent=8)
-    print
+    print()
 
 class AllFlags(DictMixin):
     def __init__(self):
diff --git a/src/python/m5/event.py b/src/python/m5/event.py
index 59d18b6fe..74863a953 100644
--- a/src/python/m5/event.py
+++ b/src/python/m5/event.py
@@ -40,6 +40,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import m5
 import _m5.event
 
@@ -76,7 +78,7 @@ class ProgressEvent(Event):
         self.eventq.schedule(self, m5.curTick() + self.period)
 
     def __call__(self):
-        print "Progress! Time now %fs" % (m5.curTick()/1e12)
+        print("Progress! Time now %fs" % (m5.curTick()/1e12))
         self.eventq.schedule(self, m5.curTick() + self.period)
 
 
diff --git a/src/python/m5/main.py b/src/python/m5/main.py
index ad452886a..9d46d4331 100644
--- a/src/python/m5/main.py
+++ b/src/python/m5/main.py
@@ -38,6 +38,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import code
 import datetime
 import os
@@ -230,12 +232,12 @@ def main(*args):
 
     # Print redirection notices here before doing any redirection
     if options.redirect_stdout and not options.redirect_stderr:
-        print "Redirecting stdout and stderr to", stdout_file
+        print("Redirecting stdout and stderr to", stdout_file)
     else:
         if options.redirect_stdout:
-            print "Redirecting stdout to", stdout_file
+            print("Redirecting stdout to", stdout_file)
         if options.redirect_stderr:
-            print "Redirecting stderr to", stderr_file
+            print("Redirecting stderr to", stderr_file)
 
     # Now redirect stdout/stderr as desired
     if options.redirect_stdout:
@@ -252,28 +254,28 @@ def main(*args):
 
     if options.build_info:
         done = True
-        print 'Build information:'
-        print
-        print 'compiled %s' % defines.compileDate;
-        print 'build options:'
+        print('Build information:')
+        print()
+        print('compiled %s' % defines.compileDate)
+        print('build options:')
         keys = defines.buildEnv.keys()
         keys.sort()
         for key in keys:
             val = defines.buildEnv[key]
-            print '    %s = %s' % (key, val)
-        print
+            print('    %s = %s' % (key, val))
+        print()
 
     if options.copyright:
         done = True
-        print info.COPYING
-        print
+        print(info.COPYING)
+        print()
 
     if options.readme:
         done = True
-        print 'Readme:'
-        print
-        print info.README
-        print
+        print('Readme:')
+        print()
+        print(info.README)
+        print()
 
     if options.debug_help:
         done = True
@@ -283,23 +285,23 @@ def main(*args):
     if options.list_sim_objects:
         import SimObject
         done = True
-        print "SimObjects:"
+        print("SimObjects:")
         objects = SimObject.allClasses.keys()
         objects.sort()
         for name in objects:
             obj = SimObject.allClasses[name]
-            print "    %s" % obj
+            print("    %s" % obj)
             params = obj._params.keys()
             params.sort()
             for pname in params:
                 param = obj._params[pname]
                 default = getattr(param, 'default', '')
-                print "        %s" % pname
+                print("        %s" % pname)
                 if default:
-                    print "            default: %s" % default
-                print "            desc: %s" % param.desc
-                print
-            print
+                    print("            default: %s" % default)
+                print("            desc: %s" % param.desc)
+                print()
+            print()
 
     if done:
         sys.exit(0)
@@ -310,26 +312,26 @@ def main(*args):
 
     verbose = options.verbose - options.quiet
     if verbose >= 0:
-        print "gem5 Simulator System.  http://gem5.org"
-        print brief_copyright
-        print
+        print("gem5 Simulator System.  http://gem5.org")
+        print(brief_copyright)
+        print()
 
-        print "gem5 compiled %s" % defines.compileDate;
+        print("gem5 compiled %s" % defines.compileDate)
 
-        print "gem5 started %s" % \
-            datetime.datetime.now().strftime("%b %e %Y %X")
-        print "gem5 executing on %s, pid %d" % \
-            (socket.gethostname(), os.getpid())
+        print("gem5 started %s" %
+              datetime.datetime.now().strftime("%b %e %Y %X"))
+        print("gem5 executing on %s, pid %d" %
+              (socket.gethostname(), os.getpid()))
 
         # in Python 3 pipes.quote() is moved to shlex.quote()
         import pipes
-        print "command line:", " ".join(map(pipes.quote, sys.argv))
-        print
+        print("command line:", " ".join(map(pipes.quote, sys.argv)))
+        print()
 
     # check to make sure we can find the listed script
     if not arguments or not os.path.isfile(arguments[0]):
         if arguments and not os.path.isfile(arguments[0]):
-            print "Script %s not found" % arguments[0]
+            print("Script %s not found" % arguments[0])
 
         options.usage(2)
 
@@ -375,7 +377,7 @@ def main(*args):
                 off = True
 
             if flag not in debug.flags:
-                print >>sys.stderr, "invalid debug flag '%s'" % flag
+                print("invalid debug flag '%s'" % flag, file=sys.stderr)
                 sys.exit(1)
 
             if off:
@@ -420,11 +422,11 @@ def main(*args):
         try:
             pdb.run(filecode, scope)
         except SystemExit:
-            print "The program exited via sys.exit(). Exit status: ",
-            print sys.exc_info()[1]
+            print("The program exited via sys.exit(). Exit status: ", end=' ')
+            print(sys.exc_info()[1])
         except:
             traceback.print_exc()
-            print "Uncaught exception. Entering post mortem debugging"
+            print("Uncaught exception. Entering post mortem debugging")
             t = sys.exc_info()[2]
             while t.tb_next is not None:
                 t = t.tb_next
@@ -441,9 +443,9 @@ if __name__ == '__main__':
 
     options, arguments = parse_options()
 
-    print 'opts:'
+    print('opts:')
     pprint(options, indent=4)
-    print
+    print()
 
-    print 'args:'
+    print('args:')
     pprint(arguments, indent=4)
diff --git a/src/python/m5/params.py b/src/python/m5/params.py
index 11a55e558..483e632f5 100644
--- a/src/python/m5/params.py
+++ b/src/python/m5/params.py
@@ -59,6 +59,8 @@
 #
 #####################################################################
 
+from __future__ import print_function
+
 import copy
 import datetime
 import re
@@ -311,7 +313,7 @@ class SimObjectVector(VectorParamValue):
                         cmd_line_str = "",
                         access_str = ""):
         if hasattr(self, "_paramEnumed"):
-            print "Cycle detected enumerating params at %s?!" % (cmd_line_str)
+            print("Cycle detected enumerating params at %s?!" % (cmd_line_str))
         else:
             x = 0
             for vals in self:
@@ -1826,8 +1828,8 @@ class PortRef(object):
             try:
                 realPeer = self.peer.unproxy(self.simobj)
             except:
-                print "Error in unproxying port '%s' of %s" % \
-                      (self.name, self.simobj.path())
+                print("Error in unproxying port '%s' of %s" %
+                      (self.name, self.simobj.path()))
                 raise
             self.connect(realPeer)
 
@@ -1856,9 +1858,9 @@ class PortRef(object):
             connectPorts(self.simobj.getCCObject(), self.name, self.index,
                          peer.simobj.getCCObject(), peer.name, peer.index)
         except:
-            print "Error connecting port %s.%s to %s.%s" % \
+            print("Error connecting port %s.%s to %s.%s" %
                   (self.simobj.path(), self.name,
-                   peer.simobj.path(), peer.name)
+                   peer.simobj.path(), peer.name))
             raise
         self.ccConnected = True
         peer.ccConnected = True
diff --git a/src/python/m5/simulate.py b/src/python/m5/simulate.py
index c47dd2250..0e1a67e47 100644
--- a/src/python/m5/simulate.py
+++ b/src/python/m5/simulate.py
@@ -40,6 +40,8 @@
 # Authors: Nathan Binkert
 #          Steve Reinhardt
 
+from __future__ import print_function
+
 import atexit
 import os
 import sys
@@ -223,7 +225,7 @@ def checkpoint(dir):
 
     drain()
     memWriteback(root)
-    print "Writing checkpoint"
+    print("Writing checkpoint")
     _m5.core.serializeAll(dir)
 
 def _changeMemoryMode(system, mode):
@@ -233,7 +235,7 @@ def _changeMemoryMode(system, mode):
     if system.getMemoryMode() != mode:
         system.setMemoryMode(mode)
     else:
-        print "System already in target mode. Memory mode unchanged."
+        print("System already in target mode. Memory mode unchanged.")
 
 def switchCpus(system, cpuList, verbose=True):
     """Switch CPUs in a system.
@@ -248,7 +250,7 @@ def switchCpus(system, cpuList, verbose=True):
     """
 
     if verbose:
-        print "switching cpus"
+        print("switching cpus")
 
     if not isinstance(cpuList, list):
         raise RuntimeError, "Must pass a list to this function"
diff --git a/src/python/m5/ticks.py b/src/python/m5/ticks.py
index ce9459f2a..582c65cac 100644
--- a/src/python/m5/ticks.py
+++ b/src/python/m5/ticks.py
@@ -26,6 +26,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import sys
 from m5.util import warn
 
@@ -39,7 +41,7 @@ def fixGlobalFrequency():
     if not tps_fixed:
         tps_fixed = True
         _m5.core.setClockFrequency(int(tps))
-        print "Global frequency set at %d ticks per second" % int(tps)
+        print("Global frequency set at %d ticks per second" % int(tps))
 
 def setGlobalFrequency(ticksPerSecond):
     from m5.util import convert
diff --git a/src/python/m5/util/__init__.py b/src/python/m5/util/__init__.py
index 573674879..2ad9c5627 100644
--- a/src/python/m5/util/__init__.py
+++ b/src/python/m5/util/__init__.py
@@ -39,6 +39,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import os
 import re
 import sys
@@ -57,26 +59,26 @@ from sorteddict import SortedDict
 # ever happen regardless of what the user does (i.e., an acutal m5
 # bug).
 def panic(fmt, *args):
-    print >>sys.stderr, 'panic:', fmt % args
+    print('panic:', fmt % args, file=sys.stderr)
     sys.exit(1)
 
 # fatal() should be called when the simulation cannot continue due to
 # some condition that is the user's fault (bad configuration, invalid
 # arguments, etc.) and not a simulator bug.
 def fatal(fmt, *args):
-    print >>sys.stderr, 'fatal:', fmt % args
+    print('fatal:', fmt % args, file=sys.stderr)
     sys.exit(1)
 
 # warn() should be called when the user should be warned about some condition
 # that may or may not be the user's fault, but that they should be made aware
 # of as it may affect the simulation or results.
 def warn(fmt, *args):
-    print >>sys.stderr, 'warn:', fmt % args
+    print('warn:', fmt % args, file=sys.stderr)
 
 # inform() should be called when the user should be informed about some
 # condition that they may be interested in.
 def inform(fmt, *args):
-    print >>sys.stdout, 'info:', fmt % args
+    print('info:', fmt % args, file=sys.stdout)
 
 class Singleton(type):
     def __call__(cls, *args, **kwargs):
@@ -166,14 +168,14 @@ def printList(items, indent=4):
     line = ' ' * indent
     for i,item in enumerate(items):
         if len(line) + len(item) > 76:
-            print line
+            print(line)
             line = ' ' * indent
 
         if i < len(items) - 1:
             line += '%s, ' % item
         else:
             line += item
-            print line
+            print(line)
 
 def readCommand(cmd, **kwargs):
     """run the command cmd, read the results and return them
diff --git a/src/python/m5/util/attrdict.py b/src/python/m5/util/attrdict.py
index cb83e9e24..d444d5d99 100644
--- a/src/python/m5/util/attrdict.py
+++ b/src/python/m5/util/attrdict.py
@@ -26,6 +26,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 __all__ = [ 'attrdict', 'multiattrdict', 'optiondict' ]
 
 class attrdict(dict):
@@ -77,24 +79,24 @@ if __name__ == '__main__':
     x = attrdict()
     x.y = 1
     x['z'] = 2
-    print x['y'], x.y
-    print x['z'], x.z
-    print dir(x)
-    print x
+    print(x['y'], x.y)
+    print(x['z'], x.z)
+    print(dir(x))
+    print(x)
 
-    print
+    print()
 
     del x['y']
     del x.z
-    print dir(x)
+    print(dir(x))
     print(x)
 
-    print
-    print "multiattrdict"
+    print()
+    print("multiattrdict")
     x = multiattrdict()
     x.x.x.x = 9
     x.y.z = 9
-    print x
-    print x.y
-    print x.y.z
-    print x.z.z
+    print(x)
+    print(x.y)
+    print(x.y.z)
+    print(x.z.z)
diff --git a/src/python/m5/util/code_formatter.py b/src/python/m5/util/code_formatter.py
index 023e189cd..a11c9d3d0 100644
--- a/src/python/m5/util/code_formatter.py
+++ b/src/python/m5/util/code_formatter.py
@@ -24,6 +24,8 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+from __future__ import print_function
+
 import __builtin__
 import inspect
 import os
@@ -312,4 +314,4 @@ if __name__ == '__main__':
 }
 ''', 1, 9)
 
-    print f,
+    print(f, end=' ')
diff --git a/src/python/m5/util/jobfile.py b/src/python/m5/util/jobfile.py
index 9c59778e5..d8c09afd4 100644
--- a/src/python/m5/util/jobfile.py
+++ b/src/python/m5/util/jobfile.py
@@ -26,6 +26,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import sys
 
 class Data(object):
@@ -69,12 +71,12 @@ class Data(object):
 
     def printinfo(self):
         if self.name:
-            print 'name: %s' % self.name
+            print('name: %s' % self.name)
         if self.desc:
-            print 'desc: %s' % self.desc
+            print('desc: %s' % self.desc)
         try:
             if self.system:
-                print 'system: %s' % self.system
+                print('system: %s' % self.system)
         except AttributeError:
             pass
 
@@ -84,8 +86,8 @@ class Data(object):
             if isinstance(val, dict):
                 import pprint
                 val = pprint.pformat(val)
-            print '%-20s = %s' % (key, val)
-        print
+            print('%-20s = %s' % (key, val))
+        print()
 
     def __contains__(self, attr):
         if attr.startswith('_'):
@@ -186,10 +188,10 @@ class Job(Data):
     def printinfo(self):
         super(Job, self).printinfo()
         if self._checkpoint:
-            print 'checkpoint: %s' % self._checkpoint.name
-        print 'config: %s' % self._config.name
-        print 'groups: %s' % [ g.name for g in self._groups ]
-        print 'options: %s' % [ o.name for o in self._options ]
+            print('checkpoint: %s' % self._checkpoint.name)
+        print('config: %s' % self._config.name)
+        print('groups: %s' % [ g.name for g in self._groups ])
+        print('options: %s' % [ o.name for o in self._options ])
         super(Job, self).printverbose()
 
 class SubOption(Data):
@@ -253,7 +255,7 @@ class Option(Data):
 
     def printinfo(self):
         super(Option, self).printinfo()
-        print 'config: %s' % self._config.name
+        print('config: %s' % self._config.name)
         super(Option, self).printverbose()
 
 class Group(Data):
@@ -283,8 +285,8 @@ class Group(Data):
 
     def printinfo(self):
         super(Group, self).printinfo()
-        print 'config: %s' % self._config.name
-        print 'options: %s' % [ o.name for o in self._options ]
+        print('config: %s' % self._config.name)
+        print('options: %s' % [ o.name for o in self._options ])
         super(Group, self).printverbose()
 
 class Configuration(Data):
@@ -397,7 +399,7 @@ class Configuration(Data):
 
     def printinfo(self):
         super(Configuration, self).printinfo()
-        print 'groups: %s' % [ g.name for g in self._groups ]
+        print('groups: %s' % [ g.name for g in self._groups ])
         super(Configuration, self).printverbose()
 
 def JobFile(jobfile):
@@ -466,7 +468,7 @@ def main(conf=None):
             cpt = ''
             if job._checkpoint:
                 cpt = job._checkpoint.name
-            print job.name, cpt
+            print(job.name, cpt)
 
 if __name__ == '__main__':
     main()
diff --git a/src/python/m5/util/multidict.py b/src/python/m5/util/multidict.py
index b5cd700ef..d22b1cbbc 100644
--- a/src/python/m5/util/multidict.py
+++ b/src/python/m5/util/multidict.py
@@ -26,6 +26,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 __all__ = [ 'multidict' ]
 
 class multidict(object):
@@ -116,10 +118,10 @@ class multidict(object):
             return default
 
     def _dump(self):
-        print 'multidict dump'
+        print('multidict dump')
         node = self
         while isinstance(node, multidict):
-            print '    ', node.local
+            print('    ', node.local)
             node = node.parent
 
     def _dumpkey(self, key):
@@ -129,7 +131,7 @@ class multidict(object):
             if key in node.local:
                 values.append(node.local[key])
             node = node.parent
-        print key, values
+        print(key, values)
 
 if __name__ == '__main__':
     test1 = multidict()
@@ -150,33 +152,33 @@ if __name__ == '__main__':
 
     test2.setdefault('f', multidict)
 
-    print 'test1>', test1.items()
-    print 'test2>', test2.items()
-    #print test1['a']
-    print test1['b']
-    print test1['c']
-    print test1['d']
-    print test1['e']
+    print('test1>', test1.items())
+    print('test2>', test2.items())
+    #print(test1['a'])
+    print(test1['b'])
+    print(test1['c'])
+    print(test1['d'])
+    print(test1['e'])
 
-    print test2['a']
-    #print test2['b']
-    print test2['c']
-    print test2['d']
-    print test2['e']
+    print(test2['a'])
+    #print(test2['b'])
+    print(test2['c'])
+    print(test2['d'])
+    print(test2['e'])
 
     for key in test2.iterkeys():
-        print key
+        print(key)
 
     test2.get('g', 'foo')
     #test2.get('b')
     test2.get('b', 'bar')
     test2.setdefault('b', 'blah')
-    print test1
-    print test2
-    print `test2`
+    print(test1)
+    print(test2)
+    print(`test2`)
 
-    print len(test2)
+    print(len(test2))
 
     test3['a'] = [ 0, 1, 2, 3 ]
 
-    print test4
+    print(test4)
diff --git a/src/python/m5/util/sorteddict.py b/src/python/m5/util/sorteddict.py
index ef32be3af..abe28376d 100644
--- a/src/python/m5/util/sorteddict.py
+++ b/src/python/m5/util/sorteddict.py
@@ -24,6 +24,8 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+from __future__ import print_function
+
 from bisect import bisect_left, bisect_right
 
 class SortedDict(dict):
@@ -181,21 +183,21 @@ class SortedDict(dict):
 
 if __name__ == '__main__':
     def display(d):
-        print d
-        print d.keys()
-        print list(d.iterkeys())
-        print d.values()
-        print list(d.itervalues())
-        print d.items()
-        print list(d.iteritems())
+        print(d)
+        print(d.keys())
+        print(list(d.iterkeys()))
+        print(d.values())
+        print(list(d.itervalues()))
+        print(d.items())
+        print(list(d.iteritems()))
 
     d = SortedDict(x=24,e=5,j=4,b=2,z=26,d=4)
     display(d)
 
-    print 'popitem', d.popitem()
+    print('popitem', d.popitem())
     display(d)
 
-    print 'pop j'
+    print('pop j')
     d.pop('j')
     display(d)
 
@@ -212,9 +214,9 @@ if __name__ == '__main__':
     d['y'] = 26
     display(d)
 
-    print `d`
+    print(`d`)
 
-    print d.copy()
+    print(d.copy())
 
     for k,v in d.itemrange('d', 'z', inclusive=True):
-        print k,v
+        print(k, v)
diff --git a/src/python/m5/util/terminal.py b/src/python/m5/util/terminal.py
index 6bf85f14d..9dc5d9850 100644
--- a/src/python/m5/util/terminal.py
+++ b/src/python/m5/util/terminal.py
@@ -26,6 +26,8 @@
 #
 # Author: Steve Reinhardt
 
+from __future__ import print_function
+
 import sys
 
 # Intended usage example:
@@ -36,7 +38,7 @@ import sys
 #    from m5.util.terminal import no_termcap as termcap
 # else:
 #    from m5.util.terminal import tty_termcap as termcap
-# print termcap.Blue + "This could be blue!" + termcap.Normal
+# print(termcap.Blue + "This could be blue!" + termcap.Normal)
 
 # ANSI color names in index order
 color_names = "Black Red Green Yellow Blue Magenta Cyan".split()
@@ -105,18 +107,18 @@ def get_termcap(use_colors = None):
 def test_termcap(obj):
     for c_name in color_names:
         c_str = getattr(obj, c_name)
-        print c_str + c_name + obj.Normal
+        print(c_str + c_name + obj.Normal)
         for attr_name in capability_names:
             if attr_name == 'Normal':
                 continue
             attr_str = getattr(obj, attr_name)
-            print attr_str + c_str + attr_name + " " + c_name + obj.Normal
-        print obj.Bold + obj.Underline + \
-              c_name + "Bold Underline " + c + obj.Normal
+            print(attr_str + c_str + attr_name + " " + c_name + obj.Normal)
+        print(obj.Bold + obj.Underline +
+              c_name + "Bold Underline " + c + obj.Normal)
 
 if __name__ == '__main__':
-    print "=== termcap enabled ==="
+    print("=== termcap enabled ===")
     test_termcap(termcap)
-    print termcap.Normal
-    print "=== termcap disabled ==="
+    print(termcap.Normal)
+    print("=== termcap disabled ===")
     test_termcap(no_termcap)
diff --git a/src/unittest/genini.py b/src/unittest/genini.py
index 19e6442de..5a4f3454b 100755
--- a/src/unittest/genini.py
+++ b/src/unittest/genini.py
@@ -27,6 +27,8 @@
 #
 # Authors: Nathan Binkert
 
+from __future__ import print_function
+
 import getopt, os, os.path, sys
 from os.path import join as joinpath, realpath
 
@@ -71,4 +73,4 @@ for arg in args:
 if globals().has_key('root') and isinstance(root, Root):
     instantiate(root)
 else:
-    print "Instantiation skipped: no root object found."
+    print("Instantiation skipped: no root object found.")
diff --git a/tests/SConscript b/tests/SConscript
index 3ed3e248b..b47315fd6 100644
--- a/tests/SConscript
+++ b/tests/SConscript
@@ -42,6 +42,8 @@
 #          Kevin Lim
 #          Andreas Sandberg
 
+from __future__ import print_function
+
 from SCons.Script.SConscript import SConsEnvironment
 import os
 import pickle
@@ -136,7 +138,7 @@ def print_test(target, source, env):
     if formatter:
         formatter.dump_suites([result])
 
-    print "***** %s: %s" % (source[0].dir, status)
+    print("***** %s: %s" % (source[0].dir, status))
     return 0
 
 printAction = env.Action(print_test, strfunction=None)
@@ -163,19 +165,19 @@ def update_test(target, source, env):
     result = result[0]
 
     if result.skipped():
-        print "*** %s: %s: Test skipped, not updating." % (
-            source[0].dir, color_message(termcap.Yellow, "WARNING"), )
+        print("*** %s: %s: Test skipped, not updating." %
+              (source[0].dir, color_message(termcap.Yellow, "WARNING")))
         return 0
     elif result:
-        print "*** %s: %s: Test successful, not updating." % (
-            source[0].dir, color_message(termcap.Green, "skipped"), )
+        print("*** %s: %s: Test successful, not updating." %
+              (source[0].dir, color_message(termcap.Green, "skipped")))
         return 0
     elif result.failed_run():
-        print "*** %s: %s: Test failed, not updating." % (
-            source[0].dir, color_message(termcap.Red, "ERROR"), )
+        print("*** %s: %s: Test failed, not updating." %
+              (source[0].dir, color_message(termcap.Red, "ERROR")))
         return 1
 
-    print "** Updating %s" % (test, )
+    print("** Updating %s" % test)
     test.update_ref()
 
     return 0
@@ -236,7 +238,7 @@ def list_tests(target, source, env):
     with open(target[0].abspath, "w") as fout:
         for cat in categories:
             for test in env.Tests[cat]:
-                print >> fout,"/".join(test)
+                print("/".join(test), file=fout)
 
     return 0