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120 lines
5.2 KiB
120 lines
5.2 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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# This module is shared by multiple languages; use include blocker.
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if(__COMPILER_GNU)
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return()
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endif()
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set(__COMPILER_GNU 1)
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include(Compiler/CMakeCommonCompilerMacros)
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include(Internal/CMakeCheckCompilerFlag)
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set(__pch_header_C "c-header")
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set(__pch_header_CXX "c++-header")
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set(__pch_header_OBJC "objective-c-header")
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set(__pch_header_OBJCXX "objective-c++-header")
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macro(__compiler_gnu lang)
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# Feature flags.
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set(CMAKE_${lang}_VERBOSE_FLAG "-v")
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set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
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set (_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER NO)
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if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4)
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set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
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# Support of PIE at link stage depends on various elements : platform, compiler, linker
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# so to activate it, module CheckPIESupported must be used.
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set (_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER YES)
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set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-pie")
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set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-no-pie")
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endif()
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if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.0)
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set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
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endif()
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set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
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set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
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set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=")
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set(CMAKE_${lang}_LINKER_WRAPPER_FLAG "-Wl,")
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set(CMAKE_${lang}_LINKER_WRAPPER_FLAG_SEP ",")
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# Older versions of gcc (< 4.5) contain a bug causing them to report a missing
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# header file as a warning if depfiles are enabled, causing check_header_file
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# tests to always succeed. Work around this by disabling dependency tracking
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# in try_compile mode.
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get_property(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
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if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
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# distcc does not transform -o to -MT when invoking the preprocessor
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# internally, as it ought to. Work around this bug by setting -MT here
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# even though it isn't strictly necessary.
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set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <OBJECT> -MF <DEPFILE>")
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endif()
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# Initial configuration flags.
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string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
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string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g")
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string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os -DNDEBUG")
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string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3 -DNDEBUG")
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string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG")
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set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
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set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
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if(NOT APPLE OR NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4) # work around #4462
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set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
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endif()
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set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
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set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO)
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# '-flto' introduced since GCC 4.5:
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# * https://gcc.gnu.org/onlinedocs/gcc-4.4.7/gcc/Option-Summary.html (no)
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# * https://gcc.gnu.org/onlinedocs/gcc-4.5.4/gcc/Option-Summary.html (yes)
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if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.5)
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set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
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set(__lto_flags -flto)
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if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.7)
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# '-ffat-lto-objects' introduced since GCC 4.7:
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# * https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Option-Summary.html (no)
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# * https://gcc.gnu.org/onlinedocs/gcc-4.7.4/gcc/Option-Summary.html (yes)
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list(APPEND __lto_flags -fno-fat-lto-objects)
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endif()
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set(CMAKE_${lang}_COMPILE_OPTIONS_IPO ${__lto_flags})
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# Need to use version of 'ar'/'ranlib' with plugin support.
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# Quote from [documentation][1]:
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#
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# To create static libraries suitable for LTO,
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# use gcc-ar and gcc-ranlib instead of ar and ranlib
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#
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# [1]: https://gcc.gnu.org/onlinedocs/gcc-4.9.4/gcc/Optimize-Options.html
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set(CMAKE_${lang}_ARCHIVE_CREATE_IPO
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"\"${CMAKE_${lang}_COMPILER_AR}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>"
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)
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set(CMAKE_${lang}_ARCHIVE_APPEND_IPO
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"\"${CMAKE_${lang}_COMPILER_AR}\" r <TARGET> <LINK_FLAGS> <OBJECTS>"
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)
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set(CMAKE_${lang}_ARCHIVE_FINISH_IPO
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"\"${CMAKE_${lang}_COMPILER_RANLIB}\" <TARGET>"
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)
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endif()
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set(CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "${CMAKE_${lang}_COMPILER}")
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if(CMAKE_${lang}_COMPILER_ARG1)
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separate_arguments(_COMPILER_ARGS NATIVE_COMMAND "${CMAKE_${lang}_COMPILER_ARG1}")
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list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS})
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unset(_COMPILER_ARGS)
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endif()
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list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
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set(CMAKE_PCH_EXTENSION .gch)
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if (NOT CMAKE_GENERATOR MATCHES "Xcode")
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set(CMAKE_PCH_PROLOGUE "#pragma GCC system_header")
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endif()
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set(CMAKE_${lang}_COMPILE_OPTIONS_USE_PCH -Winvalid-pch -include <PCH_HEADER>)
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set(CMAKE_${lang}_COMPILE_OPTIONS_CREATE_PCH -Winvalid-pch -x ${__pch_header_${lang}} -include <PCH_HEADER>)
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endmacro()
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