Use relative path to reference the libraries in the NDK.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 4fcd2117ffcf7a630d5e607cfdf6b41d850321e1..c94675bb56e1bff0fef7e1500292efb3fbf60956 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1671,11 +1671,16 @@
         # Location of Android NDK.
         'variables': {
           'variables': {
-            # Unfortunately we have to use absolute paths to the SDK/NDK because
-            # they're passed to ant which uses a different relative path from
-            # gyp.
-            'android_ndk_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/ndk/',
+            # Standard libraries can use the relative path to the NDK.
+            'android_ndk_root%': '../../third_party/android_tools/ndk/',
+            # Unfortunately, it is required to use the absolute path to the SDK
+            # because it us passed to ant which uses a different relative path
+            # from GYP.
             'android_sdk_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/sdk/',
+            # Similarly, gdbserver and the Android toolchain need to use the
+            # absolute path to the NDK because they are used at different levels
+            # in the GYP files.
+            'android_ndk_absolute_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/ndk/',
             'android_host_arch%': '<!(uname -m)',
             # Android API-level of the SDK used for compilation.
             'android_sdk_version%': '21',
@@ -1684,6 +1689,7 @@
           },
           # Copy conditionally-set variables out one scope.
           'android_ndk_root%': '<(android_ndk_root)',
+          'android_ndk_absolute_root%': '<(android_ndk_absolute_root)',
           'android_sdk_root%': '<(android_sdk_root)',
           'android_sdk_version%': '<(android_sdk_version)',
           'android_stlport_root': '<(android_ndk_root)/sources/cxx-stl/stlport',
@@ -1699,17 +1705,17 @@
           'conditions': [
             ['target_arch == "ia32"', {
               'android_app_abi%': 'x86',
-              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86/gdbserver/gdbserver',
+              'android_gdbserver%': '<(android_ndk_absolute_root)/prebuilt/android-x86/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-x86',
               'android_ndk_lib_dir%': 'usr/lib',
-              'android_toolchain%': '<(android_ndk_root)/toolchains/x86-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_absolute_root)/toolchains/x86-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "x64"', {
               'android_app_abi%': 'x86_64',
-              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86_64/gdbserver/gdbserver',
+              'android_gdbserver%': '<(android_ndk_absolute_root)/prebuilt/android-x86_64/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-21/arch-x86_64',
               'android_ndk_lib_dir%': 'usr/lib64',
-              'android_toolchain%': '<(android_ndk_root)/toolchains/x86_64-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_absolute_root)/toolchains/x86_64-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch=="arm"', {
               'conditions': [
@@ -1719,32 +1725,31 @@
                   'android_app_abi%': 'armeabi-v7a',
                 }],
               ],
-              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm/gdbserver/gdbserver',
+              'android_gdbserver%': '<(android_ndk_absolute_root)/prebuilt/android-arm/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-arm',
               'android_ndk_lib_dir%': 'usr/lib',
-              'android_toolchain%': '<(android_ndk_root)/toolchains/arm-linux-androideabi-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_absolute_root)/toolchains/arm-linux-androideabi-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "arm64"', {
               'android_app_abi%': 'arm64-v8a',
-              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm64/gdbserver/gdbserver',
+              'android_gdbserver%': '<(android_ndk_absolute_root)/prebuilt/android-arm64/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-21/arch-arm64',
               'android_ndk_lib_dir%': 'usr/lib',
-              'android_toolchain%': '<(android_ndk_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_absolute_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "mipsel"', {
               'android_app_abi%': 'mips',
-              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-mips/gdbserver/gdbserver',
+              'android_gdbserver%': '<(android_ndk_absolute_root)/prebuilt/android-mips/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-mips',
               'android_ndk_lib_dir%': 'usr/lib',
-              'android_toolchain%': '<(android_ndk_root)/toolchains/mipsel-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
+              'android_toolchain%': '<(android_ndk_absolute_root)/toolchains/mipsel-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "mips64el"', {
               'android_app_abi%': 'mips64',
-              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-mips64/gdbserver/gdbserver',
+              'android_gdbserver%': '<(android_ndk_absolute_root)/prebuilt/android-mips64/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-21/arch-mips64',
               'android_ndk_lib_dir%': 'usr/lib64',
-              'android_toolchain%': '<(android_ndk_root)/toolchains/mips64el-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
-              'gcc_version%': 49,

[Nico, 2015/03/03 16:46:27]

Is this no longer needed?

[Fabrice (no longer in Chrome), 2015/03/03 16:54:21]

This is from a time when we were using GCC 4.8 for Android and the mips64
toolchain needed  GCC 4.9. We're now using GCC 4.9 everywhere on Android.

+              'android_toolchain%': '<(android_ndk_absolute_root)/toolchains/mips64el-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
           ],
         },