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| author | Brad King <brad.king@kitware.com> | 2017-03-31 14:37:56 (GMT) |
|---|---|---|
| committer | Kitware Robot <kwrobot@kitware.com> | 2017-03-31 14:38:08 (GMT) |
| commit | 8772fc81c4ab745eb5abbae58c6a69706f610429 (patch) | |
| tree | cf974aec17ed5a474680b488d1effbf137a7db5e /Modules/Compiler | |
| parent | 60dde287e71efbad71b107902991098a6c77556d (diff) | |
| parent | dfa8263f4be4f1413b73c81649fdc4567a71e56a (diff) | |
| download | CMake-8772fc81c4ab745eb5abbae58c6a69706f610429.zip CMake-8772fc81c4ab745eb5abbae58c6a69706f610429.tar.gz CMake-8772fc81c4ab745eb5abbae58c6a69706f610429.tar.bz2 | |
Merge topic 'ipo-policy-CMP0069'
dfa8263f Implement interprocedural optimization for GNU compilers
1588a577 Add policy CMP0069 to enforce INTERPROCEDURAL_OPTIMIZATION
a7575700 Refactoring: s,GetFeatureAsBool,IsIPOEnabled,
e05835c3 CheckIPOSupported: Visual Studio and Xcode generators do not support IPO
Acked-by: Kitware Robot <kwrobot@kitware.com>
Reviewed-by: Brad King <brad.king@kitware.com>
Reviewed-by: Nils Gladitz <nilsgladitz@gmail.com>
Merge-request: !568
Diffstat (limited to 'Modules/Compiler')
| -rw-r--r-- | Modules/Compiler/Clang.cmake | 8 | ||||
| -rw-r--r-- | Modules/Compiler/GNU.cmake | 39 | ||||
| -rw-r--r-- | Modules/Compiler/QCC.cmake | 8 |
3 files changed, 55 insertions, 0 deletions
diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake index 96263fc..6b99a08 100644 --- a/Modules/Compiler/Clang.cmake +++ b/Modules/Compiler/Clang.cmake @@ -27,5 +27,13 @@ else() set(CMAKE_${lang}_COMPILE_OPTIONS_TARGET "--target=") set(CMAKE_${lang}_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN "--gcc-toolchain=") endif() + + set(_CMAKE_IPO_SUPPORTED_BY_CMAKE NO) + set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO) + + unset(CMAKE_${lang}_COMPILE_OPTIONS_IPO) + unset(CMAKE_${lang}_ARCHIVE_CREATE_IPO) + unset(CMAKE_${lang}_ARCHIVE_APPEND_IPO) + unset(CMAKE_${lang}_ARCHIVE_FINISH_IPO) endmacro() endif() diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake index b67002c..4b1c598 100644 --- a/Modules/Compiler/GNU.cmake +++ b/Modules/Compiler/GNU.cmake @@ -45,4 +45,43 @@ macro(__compiler_gnu lang) if(NOT APPLE OR NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4) # work around #4462 set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ") endif() + + set(_CMAKE_IPO_SUPPORTED_BY_CMAKE YES) + set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO) + + # '-flto' introduced since GCC 4.5: + # * https://gcc.gnu.org/onlinedocs/gcc-4.4.7/gcc/Option-Summary.html (no) + # * https://gcc.gnu.org/onlinedocs/gcc-4.5.4/gcc/Option-Summary.html (yes) + if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.5) + set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES) + set(__lto_flags -flto) + + if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.7) + # '-ffat-lto-objects' introduced since GCC 4.7: + # * https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Option-Summary.html (no) + # * https://gcc.gnu.org/onlinedocs/gcc-4.7.4/gcc/Option-Summary.html (yes) + list(APPEND __lto_flags -fno-fat-lto-objects) + endif() + + set(CMAKE_${lang}_COMPILE_OPTIONS_IPO ${__lto_flags}) + + # Need to use version of 'ar'/'ranlib' with plugin support. + # Quote from [documentation][1]: + # + # To create static libraries suitable for LTO, + # use gcc-ar and gcc-ranlib instead of ar and ranlib + # + # [1]: https://gcc.gnu.org/onlinedocs/gcc-4.9.4/gcc/Optimize-Options.html + set(CMAKE_${lang}_ARCHIVE_CREATE_IPO + "${CMAKE_GCC_AR} cr <TARGET> <LINK_FLAGS> <OBJECTS>" + ) + + set(CMAKE_${lang}_ARCHIVE_APPEND_IPO + "${CMAKE_GCC_AR} r <TARGET> <LINK_FLAGS> <OBJECTS>" + ) + + set(CMAKE_${lang}_ARCHIVE_FINISH_IPO + "${CMAKE_GCC_RANLIB} <TARGET>" + ) + endif() endmacro() diff --git a/Modules/Compiler/QCC.cmake b/Modules/Compiler/QCC.cmake index 2d7e881..695a138 100644 --- a/Modules/Compiler/QCC.cmake +++ b/Modules/Compiler/QCC.cmake @@ -12,4 +12,12 @@ macro(__compiler_qcc lang) set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-Wp,-isystem,") set(CMAKE_DEPFILE_FLAGS_${lang} "-Wc,-MD,<DEPFILE>,-MT,<OBJECT>,-MF,<DEPFILE>") + + set(_CMAKE_IPO_SUPPORTED_BY_CMAKE NO) + set(_CMAKE_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO) + + unset(CMAKE_${lang}_COMPILE_OPTIONS_IPO) + unset(CMAKE_${lang}_ARCHIVE_CREATE_IPO) + unset(CMAKE_${lang}_ARCHIVE_APPEND_IPO) + unset(CMAKE_${lang}_ARCHIVE_FINISH_IPO) endmacro() |