From: Andrey Kamaev <andrey.kamaev@itseez.com>
Date: Mon, 27 Aug 2012 15:45:24 +0000 (+0400)
Subject: Support for the gold linker (NDK r8b is required)
X-Git-Tag: accepted/2.0/20130307.220821~364^2~215^2~36^2~24
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c0786e9d338664d2d932aa76ade99030181cf9ea;p=profile%2Fivi%2Fopencv.git

Support for the gold linker (NDK r8b is required)
---

diff --git a/android/android.toolchain.cmake b/android/android.toolchain.cmake
index 97b9f39..1b42f01 100644
--- a/android/android.toolchain.cmake
+++ b/android/android.toolchain.cmake
@@ -187,7 +187,8 @@
 #     [+] updated for NDK r8b
 #     [~] all intermediate files generated by toolchain are moved into CMakeFiles
 #     [~] libstdc++ and libsupc are removed from explicit link libraries
-#     [+] added ccache support (via NDK_CCACHE environment or cmake variable)
+#     [+] added CCache support (via NDK_CCACHE environment or cmake variable)
+#     [+] added gold linker support for NDK r8b
 # ------------------------------------------------------------------------------
 
 cmake_minimum_required( VERSION 2.6.3 )
@@ -941,7 +942,7 @@ if( ANDROID_SO_UNDEFINED )
 endif()
 
 __INIT_VARIABLE( ANDROID_FUNCTION_LEVEL_LINKING VALUES ON )
-set( ANDROID_FUNCTION_LEVEL_LINKING ON CACHE BOOL "Allows or disallows undefined symbols in shared libraries" FORCE )
+set( ANDROID_FUNCTION_LEVEL_LINKING ${ANDROID_FUNCTION_LEVEL_LINKING} CACHE BOOL "Allows or disallows undefined symbols in shared libraries" FORCE )
 mark_as_advanced( ANDROID_FUNCTION_LEVEL_LINKING )
 if( ANDROID_FUNCTION_LEVEL_LINKING )
  set( ANDROID_CXX_FLAGS "${ANDROID_CXX_FLAGS} -fdata-sections -ffunction-sections" )
@@ -954,6 +955,15 @@ if( ARMEABI_V7A )
  set( ANDROID_LINKER_FLAGS "-Wl,--fix-cortex-a8 ${ANDROID_LINKER_FLAGS}" )
 endif()
 
+if( CMAKE_HOST_UNIX AND ANDROID_COMPILER_VERSION VERSION_EQUAL "4.6" AND (ARMEABI_V7A OR X86) )
+ __INIT_VARIABLE( ANDROID_USE_GOLD_LINKER VALUES ON )
+ set( ANDROID_USE_GOLD_LINKER ${ANDROID_USE_GOLD_LINKER} CACHE BOOL "Enables gold linker" FORCE )
+ mark_as_advanced( ANDROID_USE_GOLD_LINKER )
+ if( ANDROID_USE_GOLD_LINKER )
+  set( ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} -fuse-ld=gold" )
+ endif()
+endif()
+
 # cache flags
 set( CMAKE_CXX_FLAGS "${_CMAKE_CXX_FLAGS}" CACHE STRING "c++ flags" )
 set( CMAKE_C_FLAGS "${_CMAKE_C_FLAGS}" CACHE STRING "c flags" )
@@ -1058,7 +1068,8 @@ if( NOT PROJECT_NAME STREQUAL "CMAKE_TRY_COMPILE" )
  set( __toolchain_config "")
  foreach( __var NDK_CCACHE ANDROID_ABI ANDROID_FORCE_ARM_BUILD ANDROID_NATIVE_API_LEVEL ANDROID_NO_UNDEFINED
                 ANDROID_SO_UNDEFINED ANDROID_SET_OBSOLETE_VARIABLES LIBRARY_OUTPUT_PATH_ROOT ANDROID_USE_STLPORT
-                ANDROID_FORBID_SYGWIN ANDROID_NDK ANDROID_STANDALONE_TOOLCHAIN ANDROID_FUNCTION_LEVEL_LINKING __ndklibspath )
+                ANDROID_FORBID_SYGWIN ANDROID_NDK ANDROID_STANDALONE_TOOLCHAIN ANDROID_FUNCTION_LEVEL_LINKING
+                ANDROID_USE_GOLD_LINKER __ndklibspath )
   if( DEFINED ${__var} )
    if( "${__var}" MATCHES " ")
     set( __toolchain_config "${__toolchain_config}set( ${__var} \"${${__var}}\" CACHE INTERNAL \"\" )\n" )
@@ -1092,9 +1103,11 @@ endif()
 #   ANDROID_NO_UNDEFINED : ON/OFF
 #   ANDROID_SO_UNDEFINED : OFF/ON  (default depends on NDK version)
 #   ANDROID_FUNCTION_LEVEL_LINKING : ON/OFF
+#   ANDROID_USE_GOLD_LINKER : ON/OFF   (default depends on NDK version and host & target platforms)
 # Variables that takes effect only at first run:
 #   ANDROID_FORCE_ARM_BUILD : ON/OFF
 #   LIBRARY_OUTPUT_PATH_ROOT : <any valid path>
+#   NDK_CCACHE : <path to your ccache executable>
 # Can be set only at the first run:
 #   ANDROID_NDK
 #   ANDROID_STANDALONE_TOOLCHAIN