a66004bee0
Document these variables.
Change our convention for setting these variables from:
set(CMAKE_C_FLAGS_INIT "...")
to
string(APPEND CMAKE_C_FLAGS_INIT " ...")
so that any value previously set by a toolchain file will be used.
Automate the conversion with:
sed -i 's/set *(\(CMAKE_\(C\|CXX\|Fortran\|RC\|ASM\|${[^}]\+}\)_FLAGS\(_[^_]\+\)\?_INIT \+"\)/string(APPEND \1 /' \
Modules/Compiler/*.cmake Modules/Platform/*.cmake
and follow up with some manual fixes (e.g. to cases that already
meant to append). Also revert the automated changes to contexts
that are not protected from running multiple times.
59 lines
2.6 KiB
CMake
59 lines
2.6 KiB
CMake
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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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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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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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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endif()
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if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.2)
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set(CMAKE_${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_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=")
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# Older versions of gcc (< 4.5) contain a bug causing them to report a missing
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# header file as a warning if depfiles are enabled, causing check_header_file
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# tests to always succeed. Work around this by disabling dependency tracking
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# in try_compile mode.
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get_property(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
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if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
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# distcc does not transform -o to -MT when invoking the preprocessor
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# internally, as it ought to. Work around this bug by setting -MT here
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# even though it isn't strictly necessary.
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set(CMAKE_DEPFILE_FLAGS_${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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endmacro()
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