2013-10-21 18:59:40 +04:00
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#.rst:
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# WriteCompilerDetectionHeader
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# ----------------------------
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#
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# This module provides the function write_compiler_detection_header().
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#
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# The ``WRITE_COMPILER_DETECTION_HEADER`` function can be used to generate
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# a file suitable for preprocessor inclusion which contains macros to be
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# used in source code::
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#
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# write_compiler_detection_header(
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# FILE <file>
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# PREFIX <prefix>
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# COMPILERS <compiler> [...]
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# FEATURES <feature> [...]
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# [VERSION <version>]
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# [PROLOG <prolog>]
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# [EPILOG <epilog>]
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# )
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#
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# The ``write_compiler_detection_header`` function generates the
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# file ``<file>`` with macros which all have the prefix ``<prefix>``.
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#
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# ``VERSION`` may be used to specify the API version to be generated.
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# Future versions of CMake may introduce alternative APIs. A given
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# API is selected by any ``<version>`` value greater than or equal
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# to the version of CMake that introduced the given API and less
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# than the version of CMake that introduced its succeeding API.
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# The value of the :variable:`CMAKE_MINIMUM_REQUIRED_VERSION`
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# variable is used if no explicit version is specified.
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# (As of CMake version |release| there is only one API version.)
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#
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# ``PROLOG`` may be specified as text content to write at the start of the
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# header. ``EPILOG`` may be specified as text content to write at the end
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# of the header
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#
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# At least one ``<compiler>`` and one ``<feature>`` must be listed. Compilers
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# which are known to CMake, but not specified are detected and a preprocessor
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# ``#error`` is generated for them. A preprocessor macro matching
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# ``<PREFIX>_COMPILER_IS_<compiler>`` is generated for each compiler
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# known to CMake to contain the value ``0`` or ``1``.
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#
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# Possible compiler identifiers are documented with the
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# :variable:`CMAKE_<LANG>_COMPILER_ID` variable.
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# Available features in this version of CMake are listed in the
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2013-11-04 04:15:43 +04:00
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# :prop_gbl:`CMAKE_C_KNOWN_FEATURES` and
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# :prop_gbl:`CMAKE_CXX_KNOWN_FEATURES` global properties.
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2013-10-21 18:59:40 +04:00
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#
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# Feature Test Macros
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# ===================
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#
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# For each compiler, a preprocessor test of the compiler version is generated
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# denoting whether each feature is enabled. A preprocessor macro
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# matching ``<PREFIX>_COMPILER_<FEATURE>``, where ``<FEATURE>`` is the
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# upper-case ``<feature>`` name, is generated to contain the value
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# ``0`` or ``1`` depending on whether the compiler in use supports the
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# feature:
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#
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# .. code-block:: cmake
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#
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# write_compiler_detection_header(
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# FILE climbingstats_compiler_detection.h
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# PREFIX ClimbingStats
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# COMPILERS GNU Clang MSVC
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# FEATURES cxx_variadic_templates
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# )
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#
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# .. code-block:: c++
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#
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# #if ClimbingStats_COMPILER_CXX_VARIADIC_TEMPLATES
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# template<typename... T>
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# void someInterface(T t...) { /* ... */ }
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# #else
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# // Compatibility versions
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# template<typename T1>
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# void someInterface(T1 t1) { /* ... */ }
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# template<typename T1, typename T2>
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# void someInterface(T1 t1, T2 t2) { /* ... */ }
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# template<typename T1, typename T2, typename T3>
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# void someInterface(T1 t1, T2 t2, T3 t3) { /* ... */ }
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# #endif
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#
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# Symbol Macros
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# =============
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#
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# Some additional symbol-defines are created for particular features for
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# use as symbols which may be conditionally defined empty:
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#
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# .. code-block:: c++
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#
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# class MyClass ClimbingStats_DECL_CXX_FINAL
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# {
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# ClimbingStats_DECL_CXX_CONSTEXPR int someInterface() { return 42; }
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# };
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#
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# The ``ClimbingStats_DECL_CXX_FINAL`` macro will expand to ``final`` if the
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# compiler (and its flags) support the ``cxx_final`` feature, and the
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# ``ClimbingStats_DECL_CXX_CONSTEXPR`` macro will expand to ``constexpr``
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# if ``cxx_constexpr`` is supported.
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#
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# The following features generate corresponding symbol defines:
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#
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# ========================== =================================== =================
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# Feature Define Symbol
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# ========================== =================================== =================
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2013-11-04 04:15:43 +04:00
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# ``c_restrict`` ``<PREFIX>_RESTRICT`` ``restrict``
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2013-10-21 18:59:40 +04:00
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# ``cxx_constexpr`` ``<PREFIX>_CONSTEXPR`` ``constexpr``
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# ``cxx_deleted_functions`` ``<PREFIX>_DELETED_FUNCTION`` ``= delete``
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# ``cxx_extern_templates`` ``<PREFIX>_EXTERN_TEMPLATE`` ``extern``
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# ``cxx_final`` ``<PREFIX>_FINAL`` ``final``
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# ``cxx_noexcept`` ``<PREFIX>_NOEXCEPT`` ``noexcept``
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# ``cxx_noexcept`` ``<PREFIX>_NOEXCEPT_EXPR(X)`` ``noexcept(X)``
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# ``cxx_override`` ``<PREFIX>_OVERRIDE`` ``override``
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# ========================== =================================== =================
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#
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# Compatibility Implementation Macros
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# ===================================
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#
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# Some features are suitable for wrapping in a macro with a backward
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# compatibility implementation if the compiler does not support the feature.
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#
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# When the ``cxx_static_assert`` feature is not provided by the compiler,
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# a compatibility implementation is available via the
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# ``<PREFIX>_STATIC_ASSERT(COND)`` and
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# ``<PREFIX>_STATIC_ASSERT_MSG(COND, MSG)`` function-like macros. The macros
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# expand to ``static_assert`` where that compiler feature is available, and
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# to a compatibility implementation otherwise. In the first form, the
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# condition is stringified in the message field of ``static_assert``. In
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# the second form, the message ``MSG`` is passed to the message field of
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# ``static_assert``, or ignored if using the backward compatibility
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# implementation.
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#
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# ====================== ================================ ===================
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# Feature Define Symbol
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# ====================== ================================ ===================
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# ``cxx_alignas`` ``<PREFIX>_ALIGNAS`` ``alignas``
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# ``cxx_alignof`` ``<PREFIX>_ALIGNOF`` ``alignof``
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# ``cxx_nullptr`` ``<PREFIX>_NULLPTR`` ``nullptr``
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# ``cxx_static_assert`` ``<PREFIX>_STATIC_ASSERT`` ``static_assert``
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# ``cxx_static_assert`` ``<PREFIX>_STATIC_ASSERT_MSG`` ``static_assert``
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# ====================== ================================ ===================
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#=============================================================================
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# Copyright 2014 Stephen Kelly <steveire@gmail.com>
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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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include(${CMAKE_CURRENT_LIST_DIR}/CMakeParseArguments.cmake)
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include(${CMAKE_CURRENT_LIST_DIR}/CMakeCompilerIdDetection.cmake)
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function(_load_compiler_variables CompilerId lang)
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include("${CMAKE_ROOT}/Modules/Compiler/${CompilerId}-${lang}-FeatureTests.cmake" OPTIONAL)
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set(_cmake_oldestSupported_${CompilerId} ${_cmake_oldestSupported} PARENT_SCOPE)
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foreach(feature ${ARGN})
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set(_cmake_feature_test_${CompilerId}_${feature} ${_cmake_feature_test_${feature}} PARENT_SCOPE)
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endforeach()
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endfunction()
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function(write_compiler_detection_header
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file_keyword file_arg
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prefix_keyword prefix_arg
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)
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if (NOT file_keyword STREQUAL FILE)
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message(FATAL_ERROR "write_compiler_detection_header: FILE parameter missing.")
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endif()
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if (NOT prefix_keyword STREQUAL PREFIX)
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message(FATAL_ERROR "write_compiler_detection_header: PREFIX parameter missing.")
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endif()
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set(options)
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set(oneValueArgs VERSION EPILOG PROLOG)
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set(multiValueArgs COMPILERS FEATURES)
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cmake_parse_arguments(_WCD "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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if (NOT _WCD_COMPILERS)
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message(FATAL_ERROR "Invalid arguments. write_compiler_detection_header requires at least one compiler.")
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endif()
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if (NOT _WCD_FEATURES)
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message(FATAL_ERROR "Invalid arguments. write_compiler_detection_header requires at least one feature.")
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endif()
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if(_WCD_UNPARSED_ARGUMENTS)
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message(FATAL_ERROR "Unparsed arguments: ${_WCD_UNPARSED_ARGUMENTS}")
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endif()
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if(NOT _WCD_VERSION)
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set(_WCD_VERSION ${CMAKE_MINIMUM_REQUIRED_VERSION})
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endif()
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if (_WCD_VERSION VERSION_LESS 3.1.0) # Version which introduced this function
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message(FATAL_ERROR "VERSION parameter too low.")
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endif()
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set(compilers
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GNU
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2014-05-06 13:59:12 +04:00
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Clang
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2013-10-21 18:59:40 +04:00
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)
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foreach(_comp ${_WCD_COMPILERS})
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list(FIND compilers ${_comp} idx)
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if (idx EQUAL -1)
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message(FATAL_ERROR "Unsupported compiler ${_comp}.")
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endif()
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endforeach()
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set(file_content "
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// This is a generated file. Do not edit!
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#ifndef ${prefix_arg}_COMPILER_DETECTION_H
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#define ${prefix_arg}_COMPILER_DETECTION_H
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")
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if (_WCD_PROLOG)
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set(file_content "${file_content}\n${_WCD_PROLOG}\n")
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endif()
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foreach(feature ${_WCD_FEATURES})
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if (feature MATCHES "^cxx_")
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list(APPEND _langs CXX)
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list(APPEND CXX_features ${feature})
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2013-11-04 04:15:43 +04:00
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elseif (feature MATCHES "^c_")
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list(APPEND _langs C)
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list(APPEND C_features ${feature})
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2013-10-21 18:59:40 +04:00
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else()
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message(FATAL_ERROR "Unsupported feature ${feature}.")
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endif()
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endforeach()
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list(REMOVE_DUPLICATES _langs)
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foreach(_lang ${_langs})
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get_property(known_features GLOBAL PROPERTY CMAKE_${_lang}_KNOWN_FEATURES)
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foreach(feature ${${_lang}_features})
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list(FIND known_features ${feature} idx)
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if (idx EQUAL -1)
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message(FATAL_ERROR "Unsupported feature ${feature}.")
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endif()
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endforeach()
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if(_lang STREQUAL CXX)
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set(file_content "${file_content}\n#ifdef __cplusplus\n")
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2013-11-04 04:15:43 +04:00
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else()
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set(file_content "${file_content}\n#ifndef __cplusplus\n")
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2013-10-21 18:59:40 +04:00
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endif()
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compiler_id_detection(ID_CONTENT ${_lang} PREFIX ${prefix_arg}_
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ID_DEFINE
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)
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set(file_content "${file_content}${ID_CONTENT}\n")
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set(pp_if "if")
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foreach(compiler ${_WCD_COMPILERS})
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_load_compiler_variables(${compiler} ${_lang} ${${_lang}_features})
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set(file_content "${file_content}\n# ${pp_if} ${prefix_arg}_COMPILER_IS_${compiler}\n")
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set(file_content "${file_content}
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# if !(${_cmake_oldestSupported_${compiler}})
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# error Unsupported compiler version
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# endif\n")
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set(pp_if "elif")
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foreach(feature ${${_lang}_features})
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string(TOUPPER ${feature} feature_upper)
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set(feature_PP "COMPILER_${feature_upper}")
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set(_define_item "\n# define ${prefix_arg}_${feature_PP} 0\n")
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if (_cmake_feature_test_${compiler}_${feature} STREQUAL "1")
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set(_define_item "\n# define ${prefix_arg}_${feature_PP} 1\n")
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elseif (_cmake_feature_test_${compiler}_${feature})
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set(_define_item "\n# define ${prefix_arg}_${feature_PP} 0\n")
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set(_define_item "\n# if ${_cmake_feature_test_${compiler}_${feature}}\n# define ${prefix_arg}_${feature_PP} 1\n# else${_define_item}# endif\n")
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endif()
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set(file_content "${file_content}${_define_item}")
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endforeach()
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endforeach()
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if(pp_if STREQUAL "elif")
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set(file_content "${file_content}
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# else
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# error Unsupported compiler
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# endif\n")
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endif()
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foreach(feature ${${_lang}_features})
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string(TOUPPER ${feature} feature_upper)
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set(feature_PP "COMPILER_${feature_upper}")
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set(def_name ${prefix_arg}_${feature_PP})
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2013-11-04 04:15:43 +04:00
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if (feature STREQUAL c_restrict)
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set(def_value "${prefix_arg}_RESTRICT")
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set(file_content "${file_content}
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# if ${def_name}
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# define ${def_value} restrict
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# else
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# define ${def_value}
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|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
2013-10-21 18:59:40 +04:00
|
|
|
if (feature STREQUAL cxx_constexpr)
|
|
|
|
|
set(def_value "${prefix_arg}_DECL_${feature_upper}")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} constexpr
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_final)
|
|
|
|
|
set(def_value "${prefix_arg}_DECL_${feature_upper}")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} final
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_override)
|
|
|
|
|
set(def_value "${prefix_arg}_DECL_${feature_upper}")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} override
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_static_assert)
|
|
|
|
|
set(def_value "${prefix_arg}_STATIC_ASSERT(X)")
|
|
|
|
|
set(def_value_msg "${prefix_arg}_STATIC_ASSERT_MSG(X, MSG)")
|
|
|
|
|
set(static_assert_struct "template<bool> struct ${prefix_arg}StaticAssert;\ntemplate<> struct ${prefix_arg}StaticAssert<true>{};\n")
|
|
|
|
|
set(def_standard "# define ${def_value} static_assert(X, #X)\n# define ${def_value_msg} static_assert(X, MSG)")
|
|
|
|
|
set(def_alternative "${static_assert_struct}# define ${def_value} sizeof(${prefix_arg}StaticAssert<X>)\n# define ${def_value_msg} sizeof(${prefix_arg}StaticAssert<X>)")
|
|
|
|
|
set(file_content "${file_content}# if ${def_name}\n${def_standard}\n# else\n${def_alternative}\n# endif\n\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_alignas)
|
|
|
|
|
set(def_value "${prefix_arg}_ALIGNAS(X)")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} alignas(X)
|
|
|
|
|
# elif ${prefix_arg}_COMPILER_IS_GNU
|
|
|
|
|
# define ${def_value} __attribute__ ((__aligned__(X)))
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_alignof)
|
|
|
|
|
set(def_value "${prefix_arg}_ALIGNOF(X)")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} alignof(X)
|
|
|
|
|
# elif ${prefix_arg}_COMPILER_IS_GNU
|
|
|
|
|
# define ${def_value} __alignof__(X)
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_deleted_functions)
|
|
|
|
|
set(def_value "${prefix_arg}_DELETED_FUNCTION")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} = delete
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_extern_templates)
|
|
|
|
|
set(def_value "${prefix_arg}_EXTERN_TEMPLATE")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} extern
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_noexcept)
|
|
|
|
|
set(def_value "${prefix_arg}_NOEXCEPT")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} noexcept
|
|
|
|
|
# define ${def_value}_EXPR(X) noexcept(X)
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value}
|
|
|
|
|
# define ${def_value}_EXPR(X)
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
if (feature STREQUAL cxx_nullptr)
|
|
|
|
|
set(def_value "${prefix_arg}_NULLPTR")
|
|
|
|
|
set(file_content "${file_content}
|
|
|
|
|
# if ${def_name}
|
|
|
|
|
# define ${def_value} nullptr
|
|
|
|
|
# else
|
|
|
|
|
# define ${def_value} static_cast<void*>(0)
|
|
|
|
|
# endif
|
|
|
|
|
\n")
|
|
|
|
|
endif()
|
|
|
|
|
endforeach()
|
2013-11-04 04:15:43 +04:00
|
|
|
|
|
|
|
|
set(file_content "${file_content}#endif\n")
|
2013-10-21 18:59:40 +04:00
|
|
|
|
|
|
|
|
endforeach()
|
|
|
|
|
|
|
|
|
|
if (_WCD_EPILOG)
|
|
|
|
|
set(file_content "${file_content}\n${_WCD_EPILOG}\n")
|
|
|
|
|
endif()
|
|
|
|
|
set(file_content "${file_content}\n#endif")
|
|
|
|
|
|
|
|
|
|
set(CMAKE_CONFIGURABLE_FILE_CONTENT ${file_content})
|
|
|
|
|
configure_file("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
|
|
|
|
|
"${file_arg}"
|
|
|
|
|
@ONLY
|
|
|
|
|
)
|
|
|
|
|
endfunction()
|
