Add option to GYP to use chromium clang plugins.

This CL will enable the chromium-style checks when building. It is currently
disabled by default as there are a lot of warnings.

I only added this to GYP because there is no standalone GN build, so I have
no way to test.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1760213002 .

1 files changed, 38 insertions, 0 deletions

diff --git a/pdfium.gyp b/pdfium.gyp
index 08d3f085f0..6c535373e3 100644
--- a/pdfium.gyp
+++ b/pdfium.gyp
@@ -6,6 +6,12 @@
   'variables': {
     # TODO(thakis): Enable this, pdfium:29
     #'chromium_code': 1,
+
+    'variables': {
+      'clang_use_chrome_plugins%': 0,
+    },
+    'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
+
     'pdf_use_skia%': 0,
     'pdf_enable_v8%': 1,
     'pdf_enable_xfa%': 0, # Set to 1 by standalone.gypi in a standalone build.
@@ -16,6 +22,33 @@
             # few methods are used from it.
         'bundle_freetype%': 1,
       }],
+      ['clang_use_chrome_plugins==1', {
+        'variables': {
+          'conditions': [
+            ['OS!="win"', {
+              'variables': {
+                'conditions': [
+                  ['OS=="mac" or OS=="ios"', {
+                    'clang_lib_path%': '<!(cd <(DEPTH) && pwd -P)/third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib',
+                  }, { # OS != "mac" or OS != "ios"
+                    'clang_lib_path%': '<!(cd <(DEPTH) && pwd -P)/third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.so',
+                  }],
+                ],
+              },
+              'clang_dynlib_flags%': '-Xclang -load -Xclang <(clang_lib_path) ',
+            }, { # OS == "win"
+              # On Windows, the plugin is built directly into clang, so there's
+              # no need to load it dynamically.
+              'clang_dynlib_flags%': '',
+            }],
+          ],
+          'clang_plugin_args%': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-templates '
+          '-Xclang -plugin-arg-find-bad-constructs -Xclang follow-macro-expansion ',
+        },
+        'clang_chrome_plugins_flags%':
+          '<(clang_dynlib_flags)'
+          '-Xclang -add-plugin -Xclang find-bad-constructs <(clang_plugin_args)',
+      }],
     ],
   },
   'target_defaults': {
@@ -54,6 +87,11 @@
           }],
         ],
       }],
+      ['clang==1 and clang_use_chrome_plugins==1', {
+        'cflags': [
+          '<@(clang_chrome_plugins_flags)',
+        ],
+      }],
     ],
     'msvs_disabled_warnings': [
       4005, 4018, 4146, 4333, 4345, 4267,