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| author | Ruslan Baratov <ruslan_baratov@yahoo.com> | 2017-04-28 14:13:56 (GMT) |
|---|---|---|
| committer | Ruslan Baratov <ruslan_baratov@yahoo.com> | 2017-04-28 14:13:56 (GMT) |
| commit | 7d057b2738e229192ae5afe71d50354681813235 (patch) | |
| tree | bebcaf0fcca709a89a4d6e9dde390ef7003cef38 /Modules/Compiler/Clang.cmake | |
| parent | d828d0eb084cf094119d2b47dae0053267aba138 (diff) | |
| download | CMake-7d057b2738e229192ae5afe71d50354681813235.zip CMake-7d057b2738e229192ae5afe71d50354681813235.tar.gz CMake-7d057b2738e229192ae5afe71d50354681813235.tar.bz2 | |
Clang IPO (LTO) support
Diffstat (limited to 'Modules/Compiler/Clang.cmake')
| -rw-r--r-- | Modules/Compiler/Clang.cmake | 54 |
1 files changed, 48 insertions, 6 deletions
diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake index 6b99a08..8c2f87d 100644 --- a/Modules/Compiler/Clang.cmake +++ b/Modules/Compiler/Clang.cmake @@ -28,12 +28,54 @@ else() set(CMAKE_${lang}_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN "--gcc-toolchain=") endif() - set(_CMAKE_IPO_SUPPORTED_BY_CMAKE NO) - set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO) + set(_CMAKE_IPO_SUPPORTED_BY_CMAKE YES) + set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES) - unset(CMAKE_${lang}_COMPILE_OPTIONS_IPO) - unset(CMAKE_${lang}_ARCHIVE_CREATE_IPO) - unset(CMAKE_${lang}_ARCHIVE_APPEND_IPO) - unset(CMAKE_${lang}_ARCHIVE_FINISH_IPO) + string(COMPARE EQUAL "${CMAKE_${lang}_COMPILER_ID}" "AppleClang" __is_apple_clang) + + # '-flto=thin' available since Clang 3.9 and Xcode 8 + # * http://clang.llvm.org/docs/ThinLTO.html#clang-llvm + # * https://trac.macports.org/wiki/XcodeVersionInfo + set(_CMAKE_LTO_THIN TRUE) + if(__is_apple_clang) + if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 8.0) + set(_CMAKE_LTO_THIN FALSE) + endif() + else() + if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.9) + set(_CMAKE_LTO_THIN FALSE) + endif() + endif() + + if(_CMAKE_LTO_THIN) + set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "-flto=thin") + else() + set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "-flto") + endif() + + if(ANDROID) + # https://github.com/android-ndk/ndk/issues/242 + set(CMAKE_${lang}_LINK_OPTIONS_IPO "-fuse-ld=gold") + endif() + + if(ANDROID OR __is_apple_clang) + set(__ar "${CMAKE_AR}") + set(__ranlib "${CMAKE_RANLIB}") + else() + set(__ar "${CMAKE_${lang}_COMPILER_AR}") + set(__ranlib "${CMAKE_${lang}_COMPILER_RANLIB}") + endif() + + set(CMAKE_${lang}_ARCHIVE_CREATE_IPO + "${__ar} cr <TARGET> <LINK_FLAGS> <OBJECTS>" + ) + + set(CMAKE_${lang}_ARCHIVE_APPEND_IPO + "${__ar} r <TARGET> <LINK_FLAGS> <OBJECTS>" + ) + + set(CMAKE_${lang}_ARCHIVE_FINISH_IPO + "${__ranlib} <TARGET>" + ) endmacro() endif() |