diff options
Diffstat (limited to 'Modules/Compiler/GNU.cmake')
| -rw-r--r-- | Modules/Compiler/GNU.cmake | 76 |
1 files changed, 54 insertions, 22 deletions
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake index 504704dad..675e50534 100644 --- a/Modules/Compiler/GNU.cmake +++ b/Modules/Compiler/GNU.cmake @@ -1,16 +1,6 @@ +# Distributed under the OSI-approved BSD 3-Clause License. See accompanying +# file Copyright.txt or https://cmake.org/licensing for details. -#============================================================================= -# Copyright 2002-2009 Kitware, Inc. -# -# Distributed under the OSI-approved BSD License (the "License"); -# see accompanying file Copyright.txt for details. -# -# This software is distributed WITHOUT ANY WARRANTY; without even the -# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -# See the License for more information. -#============================================================================= -# (To distribute this file outside of CMake, substitute the full -# License text for the above reference.) # This module is shared by multiple languages; use include blocker. if(__COMPILER_GNU) @@ -18,6 +8,8 @@ if(__COMPILER_GNU) endif() set(__COMPILER_GNU 1) +include(Compiler/CMakeCommonCompilerMacros) + macro(__compiler_gnu lang) # Feature flags. set(CMAKE_${lang}_VERBOSE_FLAG "-v") @@ -25,11 +17,12 @@ macro(__compiler_gnu lang) if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4) set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE") endif() - if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.2) + if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.0) set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=") endif() set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC") set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared") + set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=") # Older versions of gcc (< 4.5) contain a bug causing them to report a missing # header file as a warning if depfiles are enabled, causing check_header_file @@ -40,18 +33,57 @@ macro(__compiler_gnu lang) # distcc does not transform -o to -MT when invoking the preprocessor # internally, as it ought to. Work around this bug by setting -MT here # even though it isn't strictly necessary. - set(CMAKE_DEPFILE_FLAGS_${lang} "-MMD -MT <OBJECT> -MF <DEPFILE>") + set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <OBJECT> -MF <DEPFILE>") endif() # Initial configuration flags. - set(CMAKE_${lang}_FLAGS_INIT "") - set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-g") - set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG") - set(CMAKE_${lang}_FLAGS_RELEASE_INIT "-O3 -DNDEBUG") - set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "-O2 -g -DNDEBUG") - set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>") - set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>") - if(NOT APPLE) + string(APPEND CMAKE_${lang}_FLAGS_INIT " ") + string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g") + string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os -DNDEBUG") + string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3 -DNDEBUG") + string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG") + set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>") + set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>") + if(NOT APPLE OR NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4) # work around #4462 set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ") endif() + + set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES) + set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO) + + # '-flto' introduced since GCC 4.5: + # * https://gcc.gnu.org/onlinedocs/gcc-4.4.7/gcc/Option-Summary.html (no) + # * https://gcc.gnu.org/onlinedocs/gcc-4.5.4/gcc/Option-Summary.html (yes) + if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.5) + set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES) + set(__lto_flags -flto) + + if(NOT CMAKE_${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 + "${CMAKE_${lang}_COMPILER_AR} cr <TARGET> <LINK_FLAGS> <OBJECTS>" + ) + + set(CMAKE_${lang}_ARCHIVE_APPEND_IPO + "${CMAKE_${lang}_COMPILER_AR} r <TARGET> <LINK_FLAGS> <OBJECTS>" + ) + + set(CMAKE_${lang}_ARCHIVE_FINISH_IPO + "${CMAKE_${lang}_COMPILER_RANLIB} <TARGET>" + ) + endif() endmacro() |