Makefile tweaks for cross compiling, plus example cross compile target.

Add 2 new makefile options to Mupdf. If CROSSCOMPILE is defined, then we
avoid performing tasks during the build that require a binary to be built
and then executed as part of the build. Currently this is just the cmap
and font dumping steps.

If NOX11 is defined, then we avoid building the X11 app.

Finally, in Makerules, we have a new section to show how to encapsulate
the changes for a given cross compile target. If OS is defined to be
"beagle-cross" then we build using given compilers/options.

1 files changed, 17 insertions, 0 deletions

diff --git a/Makerules b/Makerules
index 486f8adc..54e568c1 100644
--- a/Makerules
+++ b/Makerules
@@ -43,3 +43,20 @@ CFLAGS += -m32
 LDFLAGS += -m32
 endif
 endif
+
+# The following section is an example of how to simply do cross-compilation
+# using these Makefiles. It builds for a beagleboard running ARM linux,
+# compiling on windows with the CodeSourcery G++ compilers.
+# Invoke this as:
+#      make OS=beagle-cross build=release
+# This does rely on the generated directory being populated with the cmap
+# files etc first. Either do a non cross compile build (e.g. windows in MSVC
+# or windows in cygwin) first, or download the generated files from mupdf.com.
+ifeq "$(OS)" "beagle-cross"
+CC = arm-none-linux-gnueabi-gcc
+LD = arm-none-linux-gnueabi-gcc
+AR = arm-none-linux-gnueabi-ar
+CFLAGS += -O3 -mfpu=neon -mcpu=cortex-a8 -mfloat-abi=softfp -ftree-vectorize -ffast-math -fsingle-precision-constant
+CROSSCOMPILE=yes
+NOX11=yes
+endif