linux: Always use (64bit) gold for linking, even on 32bit.

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 791 matching lines @@
         # Whether PPAPI is enabled.
         ['OS=="android" or OS=="ios" or embedded==1', {
           'enable_plugins%': 0,
         }, {
           'enable_plugins%': 1,
         }],
 
         # linux_use_bundled_gold: whether to use the gold linker binary checked
         # into third_party/binutils.  Force this off via GYP_DEFINES when you
         # are using a custom toolchain and need to control -B in ldflags.
-        # Do not use 32-bit gold on 32-bit hosts as it runs out address space
         # for component=static_library builds.
-        ['OS=="linux" and (target_arch=="x64" or target_arch=="arm")', {
+        # 32bit hosts have to be 32-bit userland with a 64-bit kernel, so that

[Lei Zhang, 2014/08/26 01:01:49]

nit: 32-bit, 64-bit

[Nico, 2014/08/26 03:20:33]

Done.

+        # 64bit gold gets used. 32-bit gold will run out of address space.
+        ['OS=="linux"', {
           'linux_use_bundled_gold%': 1,
         }, {
           'linux_use_bundled_gold%': 0,
         }],
 
         # linux_use_bundled_binutils: whether to use the binary binutils
         # checked into third_party/binutils.  These are not multi-arch so cannot
         # be used except on x86 and x86-64 (the only two architectures which
-        # are currently checke in).  Force this off via GYP_DEFINES when you
+        # are currently checked in).  Force this off via GYP_DEFINES when you
         # are using a custom toolchain and need to control -B in cflags.
         ['OS=="linux" and (target_arch=="x64")', {
           'linux_use_bundled_binutils%': 1,
         }, {
           'linux_use_bundled_binutils%': 0,
         }],
 
         # linux_use_gold_flags: whether to use build flags that rely on gold.
         # On by default for x64 Linux.
         ['OS=="linux" and target_arch=="x64"', {
@@ skipping 647 matching lines @@
         'clang_xcode%': 1,
       }],
       # Enable the Syzygy optimization step for the official builds.
       ['OS=="win" and buildtype=="Official" and syzyasan!=1', {
         'syzygy_optimize%': 1,
       }, {
         'syzygy_optimize%': 0,
       }],
       # Get binutils version so we can enable debug fission if we can.
       ['os_posix==1 and OS!="mac" and OS!="ios"', {
+        # 32bit hosts have to be 32-bit userland with a 64-bit kernel, so that
+        # 64bit gold gets used. 32-bit gold will run out of address space.
+        'binutils_dir%': 'third_party/binutils/Linux_x64/Release/bin',
         'conditions': [
           # compiler_version doesn't work with clang
           # TODO(mithro): Land https://codereview.chromium.org/199793014/ so
           # compiler_version works with clang.
           # TODO(glider): set clang to 1 earlier for ASan and TSan builds so
           # that it takes effect here.
           ['clang==0 and asan==0 and lsan==0 and tsan==0 and msan==0 and ubsan==0 and ubsan_vptr==0', {
             'binutils_version%': '<!pymod_do_main(compiler_version target assembler)',
           }],
           # On Android we know the binutils version in the toolchain.
           ['OS=="android"', {
             'binutils_version%': 222,
           }],
-          ['host_arch=="x64"', {
-            'binutils_dir%': 'third_party/binutils/Linux_x64/Release/bin',
-          }],
-          ['host_arch=="ia32"', {
-            'binutils_dir%': 'third_party/binutils/Linux_ia32/Release/bin',
-          }],
           # Our version of binutils in third_party/binutils
           ['linux_use_bundled_binutils==1', {
             'binutils_version%': 224,
           }],
         ],
       }, {
         'binutils_version%': 0,
       }],
       # The version of GCC in use, set later in platforms that use GCC and have
       # not explicitly chosen to build with clang. Currently, this means all
@@ skipping 52 matching lines @@
             'CXX%': '<(CXX)',
           }],
           # All Chrome builds have breakpad symbols, but only process the
           # symbols from official builds.
           ['(branding=="Chrome" and buildtype=="Official")', {
             'linux_dump_symbols%': 1,
 
             # Omit unwind support in official release builds to save space. We
             # can use breakpad for these builds.
             'release_unwind_tables%': 0,
-
-            'conditions': [
-              # For official builds, use a 64-bit linker to avoid running out
-              # of address space. The buildbots should have a 64-bit kernel
-              # and a 64-bit libc installed.
-              ['host_arch=="ia32" and target_arch=="ia32"', {
-                'linux_use_bundled_gold%': '1',
-                'binutils_dir%': 'third_party/binutils/Linux_x64/Release/bin',
-              }],
-            ],
           }],
         ],
       }],  # os_posix==1 and OS!="mac" and OS!="ios"
       ['OS=="ios"', {
         'disable_nacl%': 1,
         'enable_background%': 0,
         'icu_use_data_file_flag%': 1,
         'enable_web_speech%': 0,
         'use_system_libxml%': 1,
         'use_system_sqlite%': 1,
@@ skipping 2595 matching lines @@
                 'cflags': [
                   # Avoids errors with current NDK:
                   # "third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/include/arm_neon.h:3426:3: error: argument must be a constant"
                   '-finstrument-functions-exclude-file-list=arm_neon.h,SaturatedArithmeticARM.h',
                 ],
               }],
             ],
           }],
           ['linux_dump_symbols==1', {
             'cflags': [ '-g' ],
-            'conditions': [
-              ['OS=="linux" and host_arch=="ia32" and linux_use_bundled_gold==0', {
-                'target_conditions': [
-                  ['_toolset=="target"', {
-                    'ldflags': [
-                      # Attempt to use less memory to prevent the linker from
-                      # running out of address space. Considering installing a
-                      # 64-bit kernel and switching to a 64-bit linker.
-                      '-Wl,--no-keep-memory',
-                    ],
-                  }],
-                ],
-              }],
-            ],
           }],
           ['use_allocator!="tcmalloc"', {
             'defines': ['NO_TCMALLOC'],
           }],
           ['linux_use_gold_flags==1', {
             # Newer gccs and clangs support -fuse-ld, use the flag to force gold
             # selection.
             # gcc -- http://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Optimize-Options.html
             'ldflags': [ '-fuse-ld=gold', ],
 
@@ skipping 1474 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }