| # 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) |
| include(Internal/CMakeCheckCompilerFlag) |
| |
| set(__pch_header_C "c-header") |
| set(__pch_header_CXX "c++-header") |
| set(__pch_header_OBJC "objective-c-header") |
| set(__pch_header_OBJCXX "objective-c++-header") |
| |
| macro(__compiler_gnu lang) |
| # Feature flags. |
| set(CMAKE_${lang}_VERBOSE_FLAG "-v") |
| set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC") |
| set (_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO) |
| if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4) |
| set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE") |
| # Support of PIE at link stage depends on various elements : platform, compiler, linker |
| # so to activate it, module CheckPIESupported must be used. |
| set (_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER YES) |
| set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-pie") |
| set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-no-pie") |
| endif() |
| if(NOT CMAKE_${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=") |
| |
| set(CMAKE_${lang}_LINKER_WRAPPER_FLAG "-Wl,") |
| set(CMAKE_${lang}_LINKER_WRAPPER_FLAG_SEP ",") |
| |
| # 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_${lang} "-MD -MT <OBJECT> -MF <DEPFILE>") |
| endif() |
| |
| # Initial configuration flags. |
| string(APPEND CMAKE_${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_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${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() |
| |
| set(CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "${CMAKE_${lang}_COMPILER}") |
| if(CMAKE_${lang}_COMPILER_ARG1) |
| separate_arguments(_COMPILER_ARGS NATIVE_COMMAND "${CMAKE_${lang}_COMPILER_ARG1}") |
| list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS}) |
| unset(_COMPILER_ARGS) |
| endif() |
| list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp") |
| |
| set(CMAKE_PCH_EXTENSION .gch) |
| if (NOT CMAKE_GENERATOR MATCHES "Xcode") |
| set(CMAKE_PCH_PROLOGUE "#pragma GCC system_header") |
| endif() |
| set(CMAKE_${lang}_COMPILE_OPTIONS_USE_PCH -Winvalid-pch -include <PCH_HEADER>) |
| set(CMAKE_${lang}_COMPILE_OPTIONS_CREATE_PCH -Winvalid-pch -x ${__pch_header_${lang}} -include <PCH_HEADER>) |
| endmacro() |