# Distributed under the OSI-approved BSD 3-Clause License. See accompanying # file Copyright.txt or https://cmake.org/licensing for details. # This module is shared by multiple languages; use include blocker. if(__COMPILER_GNU) return() endif() set(__COMPILER_GNU 1) include(Compiler/CMakeCommonCompilerMacros) macro(__compiler_gnu lang) # Feature flags. set(CMAKE_${lang}_VERBOSE_FLAG "-v") set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC") if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4) set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE") endif() if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.0) set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=") endif() set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC") set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared") set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=") # Older versions of gcc (< 4.5) contain a bug causing them to report a missing # header file as a warning if depfiles are enabled, causing check_header_file # tests to always succeed. Work around this by disabling dependency tracking # in try_compile mode. get_property(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE) if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES) # distcc does not transform -o to -MT when invoking the preprocessor # internally, as it ought to. Work around this bug by setting -MT here # even though it isn't strictly necessary. set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT -MF ") endif() # Initial configuration flags. 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 " -E > ") set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE " -S -o ") if(NOT APPLE OR NOT CMAKE_${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 " ) set(CMAKE_${lang}_ARCHIVE_APPEND_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" r " ) set(CMAKE_${lang}_ARCHIVE_FINISH_IPO "\"${CMAKE_${lang}_COMPILER_RANLIB}\" " ) endif() set(CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "${CMAKE_${lang}_COMPILER}" "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp") endmacro()