Support cross compiling for armhf variant ARM/linux.

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 207 matching lines @@
 
       # Disable file manager component extension by default.
       'file_manager_extension%': 0,
 
       # Disable image loader component extension by default.
       'image_loader_extension%': 0,
 
       # Python version.
       'python_ver%': '2.6',
 
-
       # Set NEON compilation flags.
       'arm_neon%': 1,
 
       # Detect NEON support at run-time.
       'arm_neon_optional%': 0,
 
       # The system root for cross-compiles. Default: none.
       'sysroot%': '',
 
       # The system libdir used for this ABI.
@@ skipping 429 matching lines @@
         }],
 
         ['OS=="linux" and target_arch=="arm" and chromeos==0', {
           # Set some defaults for arm/linux chrome builds
           'linux_use_tcmalloc%': 0,
           # sysroot needs to be an absolute path otherwise it generates
           # incorrect results when passed to pkg-config
           'sysroot%': '<!(cd <(DEPTH) && pwd -P)/arm-sysroot',
         }], # OS=="linux" and target_arch=="arm" and chromeos==0
 
-
         ['OS=="linux" and branding=="Chrome" and buildtype=="Official" and chromeos==0', {
           'conditions': [
             ['target_arch=="x64"', {
               'sysroot%': '<!(cd <(DEPTH) && pwd -P)/chrome/installer/linux/debian_wheezy_amd64-sysroot',
             }],
             ['target_arch=="ia32"', {
               'sysroot%': '<!(cd <(DEPTH) && pwd -P)/chrome/installer/linux/debian_wheezy_i386-sysroot',
             }],
         ],
         }], # OS=="linux" and branding=="Chrome" and buildtype=="Official" and chromeos==0
@@ skipping 1075 matching lines @@
       ['arm_version==7 and android_webview_build==0', {
         'arm_arch%': 'armv7-a',
         'arm_tune%': 'cortex-a8',
         'conditions': [
           ['arm_neon==1', {
             'arm_fpu%': 'neon',
           }, {
             'arm_fpu%': 'vfpv3-d16',
           }],
         ],
-        'arm_float_abi%': 'softfp',
+        # For ARM/linux builds we default to using the compilers default abi
+        # (normally arm-linux-gnueabi-gcc or arm-linux-gnueabihf-gcc)

[Lei Zhang, 2013/10/28 21:23:17]

Mention the permissible values are soft, softfp and hard?

+        'arm_float_abi%': 'default',
         'arm_thumb%': 1,
       }],
 
       ['android_webview_build==1', {
         # The WebView build gets its cpu-specific flags from the Android build system.
         'arm_arch%': '',
         'arm_tune%': '',
         'arm_fpu%': '',
         'arm_float_abi%': '',
         'arm_thumb%': 0,
@@ skipping 1273 matching lines @@
                   ['arm_tune!=""', {
                     'cflags': [
                       '-mtune=<(arm_tune)',
                     ],
                   }],
                   ['arm_fpu!=""', {
                     'cflags': [
                       '-mfpu=<(arm_fpu)',
                     ],
                   }],
-                  ['arm_float_abi!=""', {
+                  ['arm_float_abi!="" and arm_float_abi!="default"', {
                     'cflags': [
                       '-mfloat-abi=<(arm_float_abi)',
                     ],
                   }],
                   ['arm_thumb==1', {
                     'cflags': [
                     '-mthumb',
                     ]
                   }],
                   ['OS=="android"', {
@@ skipping 1653 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',
   },
 }