[x265] [PATCH 1 of 2 STABLE] cmake: introduce fprofile options

[Steve Borho]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1427648471 18000
#      Sun Mar 29 12:01:11 2015 -0500
# Branch stable
# Node ID 65d004d54895eb01ca1ac5a33ca2a21f77eb6ea6
# Parent  6cd3938d8683841956f255816ead000bdb307a43
cmake: introduce fprofile options

These are hidden from showing up in the GUI, since they come as 'some assembly
required'. The test-harness repo has a script which will drive this processs:

1) build with -fprofile-generate
2) run some representative test encodes
3) build with -fprofile-use

By using generic cmake options, we can add support for MSVC and other compilers

diff -r 6cd3938d8683 -r 65d004d54895 source/CMakeLists.txt
--- a/source/CMakeLists.txt	Fri Mar 27 22:59:16 2015 -0500
+++ b/source/CMakeLists.txt	Sun Mar 29 12:01:11 2015 -0500
@@ -23,6 +23,10 @@
 include(CheckSymbolExists)
 include(CheckCXXCompilerFlag)
 
+option(FPROFILE_GENERATE "Compile executable to generate usage data" OFF)
+option(FPROFILE_USE "Compile executable using generated usage data" OFF)
+mark_as_advanced(FPROFILE_USE FPROFILE_GENERATE)
+
 # X265_BUILD must be incremented each time the public API is changed
 set(X265_BUILD 50)
 configure_file("${PROJECT_SOURCE_DIR}/x265.def.in"
@@ -147,6 +151,14 @@
     if(ARM)
         add_definitions(-march=armv6 -mfloat-abi=hard -mfpu=vfp)
     endif()
+    if(FPROFILE_GENERATE)
+        add_definitions(-fprofile-generate)
+        list(APPEND LINKER_OPTIONS "-fprofile-generate")
+    endif(FPROFILE_GENERATE)
+    if(FPROFILE_USE)
+        add_definitions(-fprofile-use)
+        list(APPEND LINKER_OPTIONS "-fprofile-use")
+    endif(FPROFILE_USE)
     check_cxx_compiler_flag(-Wno-narrowing CC_HAS_NO_NARROWING) 
     check_cxx_compiler_flag(-Wno-array-bounds CC_HAS_NO_ARRAY_BOUNDS) 
     if (CC_HAS_NO_ARRAY_BOUNDS)