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CMake/Modules/Compiler/GNU-CXX.cmake

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Split GNU compiler information files This moves GNU compiler flags into new-style modules Compiler/GNU-<lang>.cmake Platform/<os>-GNU-<lang>.cmake We use language-independent helper modules Compiler/GNU.cmake Platform/<os>-GNU.cmake to define macros consolidating the information.
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include(Compiler/GNU)
__compiler_gnu(CXX)
Add a COMPILE_OPTION for a VISIBILITY_INLINES_HIDDEN target property. This corresponds to the g++ and clang++ option -fvisibility-inlines-hidden on linux. On Windows with MinGW, this corresponds to -fno-keep-inline-dllexport. That option is not supported by clang currently.
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if (WIN32)
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fno-keep-inline-dllexport")
endif()
else()
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.2)
set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
endif()
endif()
Add some COMPILE_OPTIONS for specifying C++ dialect. These are compiler-specific, compiler version specific, extension specific and standard version specific.
2013-10-13 01:26:16 +02:00
Features: Record for GNU 4.4.
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if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
Features: Record C++11 dialect switch only for GNU 4.7 and later. Previous versions of GNU are not currently supported by this CMake feature.
2014-11-19 09:37:21 +01:00
# Supported since 4.3
Add some COMPILE_OPTIONS for specifying C++ dialect. These are compiler-specific, compiler version specific, extension specific and standard version specific.
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set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++11")
set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
Features: Record for GNU 4.4.
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elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
Features: Record C++11 dialect switch only for GNU 4.7 and later. Previous versions of GNU are not currently supported by this CMake feature.
2014-11-19 09:37:21 +01:00
# 4.3 supports 0x variants
Features: Record C/CXX dialect flags for GNU 4.6. This release was prior to standardization of C11/CXX11.
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set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++0x")
set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++0x")
Add some COMPILE_OPTIONS for specifying C++ dialect. These are compiler-specific, compiler version specific, extension specific and standard version specific.
2013-10-13 01:26:16 +02:00
endif()
Features: Add cxx_auto_type. Record the availability of this feature for GNU 4.8 on (UNIX AND NOT APPLE) only. In the future, availability can be recorded for earlier GNU, for other platforms and for other compilers. Initially the affected configurations are as restricted as possible to allow for easy testing while extending the features vector in only one dimension. The error message when using the set_property API directly is not very good, but follow up commits will provide origin debugging of the property and a target_compile_features command which will provide a configure-time backtrace when possible.
2014-04-02 15:34:16 +02:00
Features: Run GNU feature tests with std=c++14 when available.
2014-11-11 23:11:17 +01:00
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++14")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++14")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
Features: Add support for C++14 features. Record the features implemented by GNU 4.9 and Clang 3.4.
2014-05-06 00:21:14 +02:00
set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++1y")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
endif()
Features: Populate CMAKE_<LANG>_STANDARD_DEFAULT only for supported compilers. If no compiler feature information is known for a given compiler version, do not set a language standard default either. The two settings must be recorded consistently.
2015-02-04 22:04:18 +01:00
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
Project: Don't require computed default dialect if compiler was forced. Commit 7235334a (Project: Determine default language dialect for the compiler., 2015-09-15) introduced a mechanism to determine the default dialect used for the running compiler. If conditions in the <CompilerId>-<Lang>.cmake file are such that compile features for that version of the compiler should be supported, the _DEFAULT_STANDARD is set to the computed value. However, the CMakeForceCompiler module allows users to bypass execution of the compiler by CMake. In that case, do not set the _DEFAULT_STANDARD variable at all, which effectively disables the compile-features where the module is used. No compile features have ever been recorded where the module is used so no functionality is lost.
2015-09-22 22:13:15 +02:00
if (NOT CMAKE_CXX_COMPILER_FORCED)
if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
endif()
set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
Project: Guess default standard dialect if compiler was forced (#15852) Prior to commit v3.4.0-rc1~71^2 (Project: Determine default language dialect for the compiler, 2015-09-15) we always guessed the default language standard dialect based on the compiler version. This was not reliable so that commit switched to computing the default language standard dialect while detecting the compiler id. When a toolchain file uses CMakeForceCompiler to set the compiler id then the detection does not occur. Therefore commit v3.4.0-rc1~54^2 (Project: Don't require computed default dialect if compiler was forced, 2015-09-22) made the lack of detection an error only if the compiler was not forced. However, this means that projects using CMakeForceCompiler no longer even get the guess that we had before so <LANG>_COMPILER does not work. Due to the sophistication of CMake's compiler detection logic projects should be ported away from using CMakeForceCompiler. In the meantime, restore a guess of the default language standard dialect when the compiler is forced.
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elseif(NOT DEFINED CMAKE_CXX_STANDARD_DEFAULT)
# Compiler id was forced so just guess the default standard level.
set(CMAKE_CXX_STANDARD_DEFAULT 98)
Project: Determine default language dialect for the compiler. Use the __cplusplus and __STDC_VERSION__ macros to automatically determine the default dialect for the compiler while determining its id and version.
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endif()
Features: Populate CMAKE_<LANG>_STANDARD_DEFAULT only for supported compilers. If no compiler feature information is known for a given compiler version, do not set a language standard default either. The two settings must be recorded consistently.
2015-02-04 22:04:18 +01:00
endif()
Features: Decay language flag if requested is not available. Use the highest standard compile flags available if requested language version is too new. This supports use-cases like set(CMAKE_CXX_STANDARD 14) # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14 # or equivalent flag add_executable(main main.cpp) This can be used in combination with preprocessor defines which communicate the availability of certain language features for optional use.
2014-03-28 16:09:35 +01:00
Features: Add cxx_auto_type. Record the availability of this feature for GNU 4.8 on (UNIX AND NOT APPLE) only. In the future, availability can be recorded for earlier GNU, for other platforms and for other compilers. Initially the affected configurations are as restricted as possible to allow for easy testing while extending the features vector in only one dimension. The error message when using the set_property API directly is not very good, but follow up commits will provide origin debugging of the property and a target_compile_features command which will provide a configure-time backtrace when possible.
2014-04-02 15:34:16 +02:00
macro(cmake_record_cxx_compile_features)
macro(_get_gcc_features std_version list)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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record_compiler_features(CXX "${std_version}" ${list})
Features: Add cxx_auto_type. Record the availability of this feature for GNU 4.8 on (UNIX AND NOT APPLE) only. In the future, availability can be recorded for earlier GNU, for other platforms and for other compilers. Initially the affected configurations are as restricted as possible to allow for easy testing while extending the features vector in only one dimension. The error message when using the set_property API directly is not very good, but follow up commits will provide origin debugging of the property and a target_compile_features command which will provide a configure-time backtrace when possible.
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endmacro()
Features: Add support for C++14 features. Record the features implemented by GNU 4.9 and Clang 3.4.
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set(_result 0)
Record compile features for GNU on Windows (#15443) Drop the 'UNIX' condition on GNU compiler features. Suggested-by: David Demelier <demelier.david@gmail.com>
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if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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_get_gcc_features(${CMAKE_CXX14_STANDARD_COMPILE_OPTION} CMAKE_CXX14_COMPILE_FEATURES)
Features: Add support for C++14 features. Record the features implemented by GNU 4.9 and Clang 3.4.
2014-05-06 00:21:14 +02:00
endif()
Record compile features for GNU on Windows (#15443) Drop the 'UNIX' condition on GNU compiler features. Suggested-by: David Demelier <demelier.david@gmail.com>
2015-03-17 13:31:44 -04:00
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
Features: Add support for C++14 features. Record the features implemented by GNU 4.9 and Clang 3.4.
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if (_result EQUAL 0)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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_get_gcc_features(${CMAKE_CXX11_STANDARD_COMPILE_OPTION} CMAKE_CXX11_COMPILE_FEATURES)
Features: Add support for C++14 features. Record the features implemented by GNU 4.9 and Clang 3.4.
2014-05-06 00:21:14 +02:00
endif()
Project: Fix exit-on-error with compile feature tests.
2014-05-06 21:31:30 +02:00
if (_result EQUAL 0)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
2014-11-11 23:06:03 +01:00
_get_gcc_features(${CMAKE_CXX98_STANDARD_COMPILE_OPTION} CMAKE_CXX98_COMPILE_FEATURES)
Project: Fix exit-on-error with compile feature tests.
2014-05-06 21:31:30 +02:00
endif()
Features: Add cxx_auto_type. Record the availability of this feature for GNU 4.8 on (UNIX AND NOT APPLE) only. In the future, availability can be recorded for earlier GNU, for other platforms and for other compilers. Initially the affected configurations are as restricted as possible to allow for easy testing while extending the features vector in only one dimension. The error message when using the set_property API directly is not very good, but follow up commits will provide origin debugging of the property and a target_compile_features command which will provide a configure-time backtrace when possible.
2014-04-02 15:34:16 +02:00
endif()
endmacro()
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