Port LTO-related flags to more platforms.

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 2987 matching lines @@
       }],
       ['enable_ipc_fuzzer==1', {
         'defines': ['ENABLE_IPC_FUZZER=1'],
       }],
       ['video_hole==1', {
         'defines': ['VIDEO_HOLE=1'],
       }],
       ['v8_use_external_startup_data==1', {
        'defines': ['V8_USE_EXTERNAL_STARTUP_DATA'],
       }],
-      ['use_lto==1 and (target_arch=="ia32" or target_arch=="x64")', {
-        # Required for third_party/zlib/crc_folding.c and various other code
-        # that uses SSE. TODO(pcc): Remove this once we properly support
-        # subtarget specific code generation in LLVM.
-        'ldflags': ['-Wl,-plugin-opt,mcpu=corei7-avx'],
-      }],
     ],  # conditions for 'target_defaults'
     'target_conditions': [
       ['<(use_libpci)==1', {
         'defines': ['USE_LIBPCI=1'],
       }],
       ['<(use_openssl)==1', {
         'defines': ['USE_OPENSSL=1'],
       }],
       ['<(use_openssl_certs)==1', {
         'defines': ['USE_OPENSSL_CERTS=1'],
@@ skipping 2910 matching lines @@
       'target_defaults': {
         'target_conditions': [
           ['_toolset=="target"', {
             'arflags': [
               '--plugin', '../../<(make_clang_dir)/lib/LLVMgold.so',
             ],
           }],
         ],
       },
     }],
+    ['use_lto==1 and clang==1 and (target_arch=="ia32" or target_arch=="x64")', {
+      'target_defaults': {
+        'target_conditions': [
+          # Required for third_party/zlib/crc_folding.c and various other code
+          # that uses SSE. TODO(pcc): Remove this once we properly support
+          # subtarget specific code generation in LLVM.
+          ['_toolset=="target"', {
+            'ldflags': [
+              '-Wl,-plugin-opt,mcpu=corei7-avx',
+            ],
+          }],
+          ['_toolset=="target" and _type!="static_library"', {
+            'xcode_settings':  {
+              'OTHER_LDFLAGS': [
+                '-Wl,-mcpu,corei7-avx',
+              ],
+            },
+          }],
+        ],
+      },
+    }],
+    ['use_lto==1 and clang==1 and target_arch=="arm"', {
+      'target_defaults': {
+        'target_conditions': [
+          ['_toolset=="target"', {
+            # Without this flag, LTO produces a .text section that is larger
+            # than the maximum call displacement, preventing the linker from

[Nico, 2015/03/21 03:48:23]

Huh, shouldn't this work without special linker flags? This kind of sounds like
a toolchain bug, no? (It's ok to land this in the meantime, but if you agree
please file a bug somewhere upstream and add a link to that here)

[pcc, 2015/03/23 18:17:43]

Done.

+            # relocating calls.
+            'ldflags': [
+              '-Wl,-plugin-opt,-function-sections',
+            ],
+          }],
+        ],
+      },
+    }],
     ['(use_lto==1 or use_lto_o2==1) and clang==0', {
       'target_defaults': {
         'target_conditions': [
           ['_toolset=="target"', {
             'ldflags': [
               '-flto=32',
             ],
           }],
         ],
       },
@@ skipping 86 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',
   },
 }