[mac] Fix cross-compilation for Android from a Mac

build/standalone.gypi

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 235 matching lines @@
       }],
       ['OS=="android"', {
         # Location of Android NDK.
         'variables': {
           'variables': {
             # The Android toolchain needs to use the absolute path to the NDK
             # because it is used at different levels in the GYP files.
             'android_ndk_root%': '<(base_dir)/third_party/android_tools/ndk/',
             'android_host_arch%': "<!(uname -m | sed -e 's/i[3456]86/x86/')",
             'host_os%': "<!(uname -s | sed -e 's/Linux/linux/;s/Darwin/mac/')",
+            'os_folder_name%': "<!(uname -s | sed -e 's/Linux/linux/;s/Darwin/darwin/')",
           },
 
           # Copy conditionally-set variables out one scope.
           'android_ndk_root%': '<(android_ndk_root)',
           'host_os%': '<(host_os)',
+          'os_folder_name%': '<(os_folder_name)',
 
           'conditions': [
             ['target_arch == "ia32"', {
-              'android_toolchain%': '<(android_ndk_root)/toolchains/x86-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/x86-4.9/prebuilt/<(os_folder_name)-<(android_host_arch)/bin',
               'android_target_arch%': 'x86',
               'android_target_platform%': '16',
+              'arm_version%': 'default',
             }],
             ['target_arch == "x64"', {
-              'android_toolchain%': '<(android_ndk_root)/toolchains/x86_64-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/x86_64-4.9/prebuilt/<(os_folder_name)-<(android_host_arch)/bin',
               'android_target_arch%': 'x86_64',
               'android_target_platform%': '21',
+              'arm_version%': 'default',
             }],
             ['target_arch=="arm"', {
-              'android_toolchain%': '<(android_ndk_root)/toolchains/arm-linux-androideabi-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/arm-linux-androideabi-4.9/prebuilt/<(os_folder_name)-<(android_host_arch)/bin',
               'android_target_arch%': 'arm',
               'android_target_platform%': '16',
               'arm_version%': 7,
             }],
             ['target_arch == "arm64"', {
-              'android_toolchain%': '<(android_ndk_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(os_folder_name)-<(android_host_arch)/bin',
               'android_target_arch%': 'arm64',
               'android_target_platform%': '21',
               'arm_version%': 'default',
             }],
             ['target_arch == "mipsel"', {
-              'android_toolchain%': '<(android_ndk_root)/toolchains/mipsel-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/mipsel-linux-android-4.9/prebuilt/<(os_folder_name)-<(android_host_arch)/bin',
               'android_target_arch%': 'mips',
               'android_target_platform%': '16',
+              'arm_version%': 'default',
             }],
             ['target_arch == "mips64el"', {
-              'android_toolchain%': '<(android_ndk_root)/toolchains/mips64el-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/mips64el-linux-android-4.9/prebuilt/<(os_folder_name)-<(android_host_arch)/bin',
               'android_target_arch%': 'mips64',
               'android_target_platform%': '21',
+              'arm_version%': 'default',
             }],
           ],
         },
 
         # Copy conditionally-set variables out one scope.
         'android_target_arch%': '<(android_target_arch)',
         'android_target_platform%': '<(android_target_platform)',
         'android_toolchain%': '<(android_toolchain)',
         'arm_version%': '<(arm_version)',
         'host_os%': '<(host_os)',
@@ skipping 27 matching lines @@
                 'android_lib': '<(android_sysroot)/usr/lib',
               }],
             ],
             'android_stlport_include': '<(android_stlport)/stlport',
             'android_stlport_libs': '<(android_stlport)/libs',
           }],
         ],
         'android_stlport_library': 'stlport_static',
       }],  # OS=="android"
       ['host_clang==1', {
+        'host_ld': '<!(which ld)',

[Jakob Kummerow, 2015/10/30 11:57:25]

Yeah, this can't be in an OS-independent section.

+        'host_ranlib': '<!(which ranlib)',
         'host_cc': '<(clang_dir)/bin/clang',
         'host_cxx': '<(clang_dir)/bin/clang++',
       }, {
+        'host_ld': '<!(which ld)',

[Jakob Kummerow, 2015/10/30 11:57:25]

Also, having the same stuff in both branches of a condition is a clear sign that
it shouldn't be conditional at all.

+        'host_ranlib': '<!(which ranlib)',
         'host_cc': '<!(which gcc)',
         'host_cxx': '<!(which g++)',
       }],
     ],
     # Default ARM variable settings.
     'arm_version%': 'default',
     'arm_fpu%': 'vfpv3',
     'arm_float_abi%': 'default',
     'arm_thumb': 'default',
 
@@ skipping 781 matching lines @@
               '-Wl,--as-needed',
             ],
           }],
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="android"
     ['OS=="android" and clang==0', {
       # Hardcode the compiler names in the Makefile so that
       # it won't depend on the environment at make time.
       'make_global_settings': [
+        ['LD', '<!(/bin/echo -n <(android_toolchain)/../*/bin/ld)'],
+        ['RANLIB', '<!(/bin/echo -n <(android_toolchain)/../*/bin/ranlib)'],
         ['CC', '<!(/bin/echo -n <(android_toolchain)/*-gcc)'],
         ['CXX', '<!(/bin/echo -n <(android_toolchain)/*-g++)'],
+        ['LD.host', '<(host_ld)'],
+        ['RANLIB.host', '<(host_ranlib)'],
         ['CC.host', '<(host_cc)'],

[Michael Achenbach, 2015/10/27 14:47:54]

Not sure if I understand the test in
https://chromium.googlesource.com/external/gyp/+/master/test/make_global_sett...
correctly, but it looks to me that AR could be set here. Did you try adding:
['AR', '<!(/bin/echo -n <(android_toolchain)/ar)'],

         ['CXX.host', '<(host_cxx)'],
       ],
     }],
     ['clang!=1 and host_clang==1 and target_arch!="ia32" and target_arch!="x64"', {
       'make_global_settings': [
         ['CC.host', '<(clang_dir)/bin/clang'],
         ['CXX.host', '<(clang_dir)/bin/clang++'],
       ],
     }],
     ['clang==0 and host_clang==1 and target_arch!="ia32" and target_arch!="x64"', {
@@ skipping 147 matching lines @@
               '-fsanitize=cfi-vcall',
               '-fsanitize=cfi-derived-cast',
               '-fsanitize=cfi-unrelated-cast',
             ],
           }],
         ],
       },
     }],
   ],
 }