Enable debug fission for Chrome debug builds.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index d21c0f3b7bc9ef8a03ad7de835e265155cee8ea8..bb8f80dbcbfb2a986ef3167e9f11449197fd26e7 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1299,12 +1299,15 @@
           ['OS=="android"', {
             # We directly set the gcc_version since we know what we use.
             'gcc_version%': 46,
+            'binutils_version%': 222,
           }, {
             'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
+            'binutils_version%': '<!(python <(DEPTH)/build/compiler_version.py assembler)',
           }],
         ],
       }, {
         'gcc_version%': 0,
+        'binutils_version%': 0,
       }],
       ['OS=="win" and "<!(python <(DEPTH)/build/dir_exists.py <(windows_sdk_default_path))"=="True"', {
         'windows_sdk_path%': '<(windows_sdk_default_path)',
@@ -3083,6 +3086,12 @@
               }, {
                 'cflags': ['-fno-unwind-tables', '-fno-asynchronous-unwind-tables'],
               }],
+              # http://gcc.gnu.org/wiki/DebugFission
+              # Requires gold and gcc >= 4.7 or clang.
+              ['linux_use_gold_flags==1 and (clang==1 or gcc_version>=47) and binutils_version>=223', {
+                'cflags': ['-gsplit-dwarf'],
+                'ldflags': ['-Wl,--gdb-index'],

[Nico, 2014/03/17 09:07:38]

Is there some way we can get this to pick up all the required custom binutils
bits from your other CL? For gold, I think we add -Bpath/to/gold to ldflags,
would something like that work?

[mithro-old, 2014/03/17 10:36:21]

See https://codereview.chromium.org/196573022/ which does exactly this.

+              }],
             ],
           },
           'Release_Base': {