https://github.com/Kitware/CMake
Tip revision: 62942969062fcc9f24ca057b6983532a973cfad6 authored by Brad King on 28 November 2018, 11:49:16 UTC
CMake 3.13.1
CMake 3.13.1
Tip revision: 6294296
WriteCompilerDetectionHeader.cmake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# WriteCompilerDetectionHeader
# ----------------------------
#
# This module provides the function write_compiler_detection_header().
#
# The ``WRITE_COMPILER_DETECTION_HEADER`` function can be used to generate
# a file suitable for preprocessor inclusion which contains macros to be
# used in source code::
#
# write_compiler_detection_header(
# FILE <file>
# PREFIX <prefix>
# [OUTPUT_FILES_VAR <output_files_var> OUTPUT_DIR <output_dir>]
# COMPILERS <compiler> [...]
# FEATURES <feature> [...]
# [BARE_FEATURES <feature> [...]]
# [VERSION <version>]
# [PROLOG <prolog>]
# [EPILOG <epilog>]
# [ALLOW_UNKNOWN_COMPILERS]
# [ALLOW_UNKNOWN_COMPILER_VERSIONS]
# )
#
# The ``write_compiler_detection_header`` function generates the
# file ``<file>`` with macros which all have the prefix ``<prefix>``.
#
# By default, all content is written directly to the ``<file>``. The
# ``OUTPUT_FILES_VAR`` may be specified to cause the compiler-specific
# content to be written to separate files. The separate files are then
# available in the ``<output_files_var>`` and may be consumed by the caller
# for installation for example. The ``OUTPUT_DIR`` specifies a relative
# path from the main ``<file>`` to the compiler-specific files. For example:
#
# .. code-block:: cmake
#
# write_compiler_detection_header(
# FILE climbingstats_compiler_detection.h
# PREFIX ClimbingStats
# OUTPUT_FILES_VAR support_files
# OUTPUT_DIR compilers
# COMPILERS GNU Clang MSVC Intel
# FEATURES cxx_variadic_templates
# )
# install(FILES
# ${CMAKE_CURRENT_BINARY_DIR}/climbingstats_compiler_detection.h
# DESTINATION include
# )
# install(FILES
# ${support_files}
# DESTINATION include/compilers
# )
#
#
# ``VERSION`` may be used to specify the API version to be generated.
# Future versions of CMake may introduce alternative APIs. A given
# API is selected by any ``<version>`` value greater than or equal
# to the version of CMake that introduced the given API and less
# than the version of CMake that introduced its succeeding API.
# The value of the :variable:`CMAKE_MINIMUM_REQUIRED_VERSION`
# variable is used if no explicit version is specified.
# (As of CMake version |release| there is only one API version.)
#
# ``PROLOG`` may be specified as text content to write at the start of the
# header. ``EPILOG`` may be specified as text content to write at the end
# of the header
#
# At least one ``<compiler>`` and one ``<feature>`` must be listed. Compilers
# which are known to CMake, but not specified are detected and a preprocessor
# ``#error`` is generated for them. A preprocessor macro matching
# ``<PREFIX>_COMPILER_IS_<compiler>`` is generated for each compiler
# known to CMake to contain the value ``0`` or ``1``.
#
# Possible compiler identifiers are documented with the
# :variable:`CMAKE_<LANG>_COMPILER_ID` variable.
# Available features in this version of CMake are listed in the
# :prop_gbl:`CMAKE_C_KNOWN_FEATURES` and
# :prop_gbl:`CMAKE_CXX_KNOWN_FEATURES` global properties.
# The ``{c,cxx}_std_*`` meta-features are ignored if requested.
#
# See the :manual:`cmake-compile-features(7)` manual for information on
# compile features.
#
# ``BARE_FEATURES`` will define the compatibility macros with the name used in
# newer versions of the language standard, so the code can use the new feature
# name unconditionally.
#
# ``ALLOW_UNKNOWN_COMPILERS`` and ``ALLOW_UNKNOWN_COMPILER_VERSIONS`` cause
# the module to generate conditions that treat unknown compilers as simply
# lacking all features. Without these options the default behavior is to
# generate a ``#error`` for unknown compilers and versions.
#
# Feature Test Macros
# ===================
#
# For each compiler, a preprocessor macro is generated matching
# ``<PREFIX>_COMPILER_IS_<compiler>`` which has the content either ``0``
# or ``1``, depending on the compiler in use. Preprocessor macros for
# compiler version components are generated matching
# ``<PREFIX>_COMPILER_VERSION_MAJOR`` ``<PREFIX>_COMPILER_VERSION_MINOR``
# and ``<PREFIX>_COMPILER_VERSION_PATCH`` containing decimal values
# for the corresponding compiler version components, if defined.
#
# A preprocessor test is generated based on the compiler version
# denoting whether each feature is enabled. A preprocessor macro
# matching ``<PREFIX>_COMPILER_<FEATURE>``, where ``<FEATURE>`` is the
# upper-case ``<feature>`` name, is generated to contain the value
# ``0`` or ``1`` depending on whether the compiler in use supports the
# feature:
#
# .. code-block:: cmake
#
# write_compiler_detection_header(
# FILE climbingstats_compiler_detection.h
# PREFIX ClimbingStats
# COMPILERS GNU Clang AppleClang MSVC Intel
# FEATURES cxx_variadic_templates
# )
#
# .. code-block:: c++
#
# #if ClimbingStats_COMPILER_CXX_VARIADIC_TEMPLATES
# template<typename... T>
# void someInterface(T t...) { /* ... */ }
# #else
# // Compatibility versions
# template<typename T1>
# void someInterface(T1 t1) { /* ... */ }
# template<typename T1, typename T2>
# void someInterface(T1 t1, T2 t2) { /* ... */ }
# template<typename T1, typename T2, typename T3>
# void someInterface(T1 t1, T2 t2, T3 t3) { /* ... */ }
# #endif
#
# Symbol Macros
# =============
#
# Some additional symbol-defines are created for particular features for
# use as symbols which may be conditionally defined empty:
#
# .. code-block:: c++
#
# class MyClass ClimbingStats_FINAL
# {
# ClimbingStats_CONSTEXPR int someInterface() { return 42; }
# };
#
# The ``ClimbingStats_FINAL`` macro will expand to ``final`` if the
# compiler (and its flags) support the ``cxx_final`` feature, and the
# ``ClimbingStats_CONSTEXPR`` macro will expand to ``constexpr``
# if ``cxx_constexpr`` is supported.
#
# If ``BARE_FEATURES cxx_final`` was given as argument the ``final`` keyword
# will be defined for old compilers, too.
#
# The following features generate corresponding symbol defines and if they
# are available as ``BARE_FEATURES``:
#
# ========================== =================================== ================= ======
# Feature Define Symbol bare
# ========================== =================================== ================= ======
# ``c_restrict`` ``<PREFIX>_RESTRICT`` ``restrict`` yes
# ``cxx_constexpr`` ``<PREFIX>_CONSTEXPR`` ``constexpr`` yes
# ``cxx_deleted_functions`` ``<PREFIX>_DELETED_FUNCTION`` ``= delete``
# ``cxx_extern_templates`` ``<PREFIX>_EXTERN_TEMPLATE`` ``extern``
# ``cxx_final`` ``<PREFIX>_FINAL`` ``final`` yes
# ``cxx_noexcept`` ``<PREFIX>_NOEXCEPT`` ``noexcept`` yes
# ``cxx_noexcept`` ``<PREFIX>_NOEXCEPT_EXPR(X)`` ``noexcept(X)``
# ``cxx_override`` ``<PREFIX>_OVERRIDE`` ``override`` yes
# ========================== =================================== ================= ======
#
# Compatibility Implementation Macros
# ===================================
#
# Some features are suitable for wrapping in a macro with a backward
# compatibility implementation if the compiler does not support the feature.
#
# When the ``cxx_static_assert`` feature is not provided by the compiler,
# a compatibility implementation is available via the
# ``<PREFIX>_STATIC_ASSERT(COND)`` and
# ``<PREFIX>_STATIC_ASSERT_MSG(COND, MSG)`` function-like macros. The macros
# expand to ``static_assert`` where that compiler feature is available, and
# to a compatibility implementation otherwise. In the first form, the
# condition is stringified in the message field of ``static_assert``. In
# the second form, the message ``MSG`` is passed to the message field of
# ``static_assert``, or ignored if using the backward compatibility
# implementation.
#
# The ``cxx_attribute_deprecated`` feature provides a macro definition
# ``<PREFIX>_DEPRECATED``, which expands to either the standard
# ``[[deprecated]]`` attribute or a compiler-specific decorator such
# as ``__attribute__((__deprecated__))`` used by GNU compilers.
#
# The ``cxx_alignas`` feature provides a macro definition
# ``<PREFIX>_ALIGNAS`` which expands to either the standard ``alignas``
# decorator or a compiler-specific decorator such as
# ``__attribute__ ((__aligned__))`` used by GNU compilers.
#
# The ``cxx_alignof`` feature provides a macro definition
# ``<PREFIX>_ALIGNOF`` which expands to either the standard ``alignof``
# decorator or a compiler-specific decorator such as ``__alignof__``
# used by GNU compilers.
#
# ============================= ================================ ===================== ======
# Feature Define Symbol bare
# ============================= ================================ ===================== ======
# ``cxx_alignas`` ``<PREFIX>_ALIGNAS`` ``alignas``
# ``cxx_alignof`` ``<PREFIX>_ALIGNOF`` ``alignof``
# ``cxx_nullptr`` ``<PREFIX>_NULLPTR`` ``nullptr`` yes
# ``cxx_static_assert`` ``<PREFIX>_STATIC_ASSERT`` ``static_assert``
# ``cxx_static_assert`` ``<PREFIX>_STATIC_ASSERT_MSG`` ``static_assert``
# ``cxx_attribute_deprecated`` ``<PREFIX>_DEPRECATED`` ``[[deprecated]]``
# ``cxx_attribute_deprecated`` ``<PREFIX>_DEPRECATED_MSG`` ``[[deprecated]]``
# ``cxx_thread_local`` ``<PREFIX>_THREAD_LOCAL`` ``thread_local``
# ============================= ================================ ===================== ======
#
# A use-case which arises with such deprecation macros is the deprecation
# of an entire library. In that case, all public API in the library may
# be decorated with the ``<PREFIX>_DEPRECATED`` macro. This results in
# very noisy build output when building the library itself, so the macro
# may be may be defined to empty in that case when building the deprecated
# library:
#
# .. code-block:: cmake
#
# add_library(compat_support ${srcs})
# target_compile_definitions(compat_support
# PRIVATE
# CompatSupport_DEPRECATED=
# )
include(${CMAKE_CURRENT_LIST_DIR}/CMakeCompilerIdDetection.cmake)
function(_load_compiler_variables CompilerId lang)
include("${CMAKE_ROOT}/Modules/Compiler/${CompilerId}-${lang}-FeatureTests.cmake" OPTIONAL)
set(_cmake_oldestSupported_${CompilerId} ${_cmake_oldestSupported} PARENT_SCOPE)
foreach(feature ${ARGN})
set(_cmake_feature_test_${CompilerId}_${feature} ${_cmake_feature_test_${feature}} PARENT_SCOPE)
endforeach()
include("${CMAKE_ROOT}/Modules/Compiler/${CompilerId}-${lang}-DetermineCompiler.cmake" OPTIONAL
RESULT_VARIABLE determinedCompiler)
if (NOT determinedCompiler)
include("${CMAKE_ROOT}/Modules/Compiler/${CompilerId}-DetermineCompiler.cmake" OPTIONAL)
endif()
set(_compiler_id_version_compute_${CompilerId} ${_compiler_id_version_compute} PARENT_SCOPE)
endfunction()
macro(_simpledefine FEATURE_NAME FEATURE_TESTNAME FEATURE_STRING FEATURE_DEFAULT_STRING)
if (feature STREQUAL "${FEATURE_NAME}")
set(def_value "${prefix_arg}_${FEATURE_TESTNAME}")
string(APPEND file_content "
# if defined(${def_name}) && ${def_name}
# define ${def_value} ${FEATURE_STRING}
# else
# define ${def_value} ${FEATURE_DEFAULT_STRING}
# endif
\n")
endif()
endmacro()
macro(_simplebaredefine FEATURE_NAME FEATURE_STRING FEATURE_DEFAULT_STRING)
if (feature STREQUAL "${FEATURE_NAME}")
string(APPEND file_content "
# if !(defined(${def_name}) && ${def_name})
# define ${FEATURE_STRING} ${FEATURE_DEFAULT_STRING}
# endif
\n")
endif()
endmacro()
function(_check_feature_lists C_FEATURE_VAR CXX_FEATURE_VAR)
foreach(feature ${ARGN})
if (feature MATCHES "^c_std_")
# ignored
elseif (feature MATCHES "^cxx_std_")
# ignored
elseif (feature MATCHES "^cxx_")
list(APPEND _langs CXX)
list(APPEND ${CXX_FEATURE_VAR} ${feature})
elseif (feature MATCHES "^c_")
list(APPEND _langs C)
list(APPEND ${C_FEATURE_VAR} ${feature})
else()
message(FATAL_ERROR "Unsupported feature ${feature}.")
endif()
endforeach()
set(${C_FEATURE_VAR} ${${C_FEATURE_VAR}} PARENT_SCOPE)
set(${CXX_FEATURE_VAR} ${${CXX_FEATURE_VAR}} PARENT_SCOPE)
set(_langs ${_langs} PARENT_SCOPE)
endfunction()
function(write_compiler_detection_header
file_keyword file_arg
prefix_keyword prefix_arg
)
if (NOT "x${file_keyword}" STREQUAL "xFILE")
message(FATAL_ERROR "write_compiler_detection_header: FILE parameter missing.")
endif()
if (NOT "x${prefix_keyword}" STREQUAL "xPREFIX")
message(FATAL_ERROR "write_compiler_detection_header: PREFIX parameter missing.")
endif()
set(options ALLOW_UNKNOWN_COMPILERS ALLOW_UNKNOWN_COMPILER_VERSIONS)
set(oneValueArgs VERSION EPILOG PROLOG OUTPUT_FILES_VAR OUTPUT_DIR)
set(multiValueArgs COMPILERS FEATURES BARE_FEATURES)
cmake_parse_arguments(_WCD "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
if (NOT _WCD_COMPILERS)
message(FATAL_ERROR "Invalid arguments. write_compiler_detection_header requires at least one compiler.")
endif()
if (NOT _WCD_FEATURES AND NOT _WCD_BARE_FEATURES)
message(FATAL_ERROR "Invalid arguments. write_compiler_detection_header requires at least one feature.")
endif()
if(_WCD_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "Unparsed arguments: ${_WCD_UNPARSED_ARGUMENTS}")
endif()
if (prefix_arg STREQUAL "")
message(FATAL_ERROR "A prefix must be specified")
endif()
string(MAKE_C_IDENTIFIER ${prefix_arg} cleaned_prefix)
if (NOT prefix_arg STREQUAL cleaned_prefix)
message(FATAL_ERROR "The prefix must be a valid C identifier.")
endif()
if(NOT _WCD_VERSION)
set(_WCD_VERSION ${CMAKE_MINIMUM_REQUIRED_VERSION})
endif()
set(_min_version 3.1.0) # Version which introduced this function
if (_WCD_VERSION VERSION_LESS _min_version)
set(err "VERSION compatibility for write_compiler_detection_header is set to ${_WCD_VERSION}, which is too low.")
string(APPEND err " It must be set to at least ${_min_version}. ")
string(APPEND err " Either set the VERSION parameter to the write_compiler_detection_header function, or update")
string(APPEND err " your minimum required CMake version with the cmake_minimum_required command.")
message(FATAL_ERROR "${err}")
endif()
if(_WCD_OUTPUT_FILES_VAR)
if(NOT _WCD_OUTPUT_DIR)
message(FATAL_ERROR "If OUTPUT_FILES_VAR is specified, then OUTPUT_DIR must also be specified.")
endif()
endif()
if(_WCD_OUTPUT_DIR)
if(NOT _WCD_OUTPUT_FILES_VAR)
message(FATAL_ERROR "If OUTPUT_DIR is specified, then OUTPUT_FILES_VAR must also be specified.")
endif()
get_filename_component(main_file_dir ${file_arg} DIRECTORY)
if (NOT IS_ABSOLUTE ${main_file_dir})
set(main_file_dir "${CMAKE_CURRENT_BINARY_DIR}/${main_file_dir}")
endif()
if (NOT IS_ABSOLUTE ${_WCD_OUTPUT_DIR})
set(_WCD_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/${_WCD_OUTPUT_DIR}")
endif()
get_filename_component(out_file_dir ${_WCD_OUTPUT_DIR} ABSOLUTE)
string(FIND ${out_file_dir} ${main_file_dir} idx)
if (NOT idx EQUAL 0)
message(FATAL_ERROR "The compiler-specific output directory must be within the same directory as the main file.")
endif()
if (main_file_dir STREQUAL out_file_dir)
unset(_WCD_OUTPUT_DIR)
else()
string(REPLACE "${main_file_dir}/" "" _WCD_OUTPUT_DIR "${out_file_dir}/")
endif()
endif()
set(compilers
GNU
Clang
AppleClang
MSVC
SunPro
Intel
)
set(_hex_compilers ADSP Borland Embarcadero SunPro)
foreach(_comp ${_WCD_COMPILERS})
list(FIND compilers ${_comp} idx)
if (idx EQUAL -1)
message(FATAL_ERROR "Unsupported compiler ${_comp}.")
endif()
if (NOT _need_hex_conversion)
list(FIND _hex_compilers ${_comp} idx)
if (NOT idx EQUAL -1)
set(_need_hex_conversion TRUE)
endif()
endif()
endforeach()
set(file_content "
// This is a generated file. Do not edit!
#ifndef ${prefix_arg}_COMPILER_DETECTION_H
#define ${prefix_arg}_COMPILER_DETECTION_H
")
if (_WCD_PROLOG)
string(APPEND file_content "\n${_WCD_PROLOG}\n")
endif()
if (_need_hex_conversion)
string(APPEND file_content "
#define ${prefix_arg}_DEC(X) (X)
#define ${prefix_arg}_HEX(X) ( \\
((X)>>28 & 0xF) * 10000000 + \\
((X)>>24 & 0xF) * 1000000 + \\
((X)>>20 & 0xF) * 100000 + \\
((X)>>16 & 0xF) * 10000 + \\
((X)>>12 & 0xF) * 1000 + \\
((X)>>8 & 0xF) * 100 + \\
((X)>>4 & 0xF) * 10 + \\
((X) & 0xF) \\
)\n")
endif()
_check_feature_lists(C_features CXX_features ${_WCD_FEATURES})
_check_feature_lists(C_bare_features CXX_bare_features ${_WCD_BARE_FEATURES})
list(REMOVE_DUPLICATES _langs)
if(_WCD_OUTPUT_FILES_VAR)
get_filename_component(main_file_name ${file_arg} NAME)
set(compiler_file_content_
"#ifndef ${prefix_arg}_COMPILER_DETECTION_H
# error This file may only be included from ${main_file_name}
#endif\n")
endif()
foreach(_lang ${_langs})
set(target_compilers)
foreach(compiler ${_WCD_COMPILERS})
_load_compiler_variables(${compiler} ${_lang} ${${_lang}_features})
if(_cmake_oldestSupported_${compiler})
list(APPEND target_compilers ${compiler})
endif()
endforeach()
get_property(known_features GLOBAL PROPERTY CMAKE_${_lang}_KNOWN_FEATURES)
foreach(feature ${${_lang}_features})
list(FIND known_features ${feature} idx)
if (idx EQUAL -1)
message(FATAL_ERROR "Unsupported feature ${feature}.")
endif()
endforeach()
if(_lang STREQUAL CXX)
string(APPEND file_content "\n#ifdef __cplusplus\n")
else()
string(APPEND file_content "\n#ifndef __cplusplus\n")
endif()
compiler_id_detection(ID_CONTENT ${_lang} PREFIX ${prefix_arg}_
ID_DEFINE
)
string(APPEND file_content "${ID_CONTENT}\n")
set(pp_if "if")
foreach(compiler ${target_compilers})
string(APPEND file_content "\n# ${pp_if} ${prefix_arg}_COMPILER_IS_${compiler}\n")
if(_WCD_OUTPUT_FILES_VAR)
set(compile_file_name "${_WCD_OUTPUT_DIR}${prefix_arg}_COMPILER_INFO_${compiler}_${_lang}.h")
string(APPEND file_content "\n# include \"${compile_file_name}\"\n")
endif()
if(_WCD_OUTPUT_FILES_VAR)
set(compiler_file_content compiler_file_content_${compiler}_${_lang})
else()
set(compiler_file_content file_content)
endif()
if(NOT _WCD_ALLOW_UNKNOWN_COMPILER_VERSIONS)
string(APPEND ${compiler_file_content} "
# if !(${_cmake_oldestSupported_${compiler}})
# error Unsupported compiler version
# endif\n")
endif()
set(PREFIX ${prefix_arg}_)
if (_need_hex_conversion)
set(MACRO_DEC ${prefix_arg}_DEC)
set(MACRO_HEX ${prefix_arg}_HEX)
else()
set(MACRO_DEC)
set(MACRO_HEX)
endif()
string(CONFIGURE "${_compiler_id_version_compute_${compiler}}" VERSION_BLOCK @ONLY)
string(APPEND ${compiler_file_content} "${VERSION_BLOCK}\n")
set(PREFIX)
set(MACRO_DEC)
set(MACRO_HEX)
set(pp_if "elif")
foreach(feature ${${_lang}_features})
string(TOUPPER ${feature} feature_upper)
set(feature_PP "COMPILER_${feature_upper}")
set(_define_item "\n# define ${prefix_arg}_${feature_PP} 0\n")
if (_cmake_feature_test_${compiler}_${feature} STREQUAL "1")
set(_define_item "\n# define ${prefix_arg}_${feature_PP} 1\n")
elseif (_cmake_feature_test_${compiler}_${feature})
set(_define_item "\n# define ${prefix_arg}_${feature_PP} 0\n")
set(_define_item "\n# if ${_cmake_feature_test_${compiler}_${feature}}\n# define ${prefix_arg}_${feature_PP} 1\n# else${_define_item}# endif\n")
endif()
string(APPEND ${compiler_file_content} "${_define_item}")
endforeach()
endforeach()
if(pp_if STREQUAL "elif")
if(_WCD_ALLOW_UNKNOWN_COMPILERS)
string(APPEND file_content "
# endif\n")
else()
string(APPEND file_content "
# else
# error Unsupported compiler
# endif\n")
endif()
endif()
foreach(feature ${${_lang}_features})
string(TOUPPER ${feature} feature_upper)
set(feature_PP "COMPILER_${feature_upper}")
set(def_name ${prefix_arg}_${feature_PP})
_simpledefine(c_restrict RESTRICT restrict "")
_simpledefine(cxx_constexpr CONSTEXPR constexpr "")
_simpledefine(cxx_final FINAL final "")
_simpledefine(cxx_override OVERRIDE override "")
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(def_fallback "enum { ${prefix_arg}_STATIC_ASSERT_JOIN(${prefix_arg}StaticAssertEnum, __LINE__) = sizeof(${prefix_arg}StaticAssert<X>) }")
string(APPEND file_content "# if defined(${def_name}) && ${def_name}
# define ${def_value} static_assert(X, #X)
# define ${def_value_msg} static_assert(X, MSG)
# else
# define ${prefix_arg}_STATIC_ASSERT_JOIN(X, Y) ${prefix_arg}_STATIC_ASSERT_JOIN_IMPL(X, Y)
# define ${prefix_arg}_STATIC_ASSERT_JOIN_IMPL(X, Y) X##Y
template<bool> struct ${prefix_arg}StaticAssert;
template<> struct ${prefix_arg}StaticAssert<true>{};
# define ${def_value} ${def_fallback}
# define ${def_value_msg} ${def_fallback}
# endif
\n")
endif()
if (feature STREQUAL cxx_alignas)
set(def_value "${prefix_arg}_ALIGNAS(X)")
string(APPEND file_content "
# if defined(${def_name}) && ${def_name}
# define ${def_value} alignas(X)
# elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
# define ${def_value} __attribute__ ((__aligned__(X)))
# elif ${prefix_arg}_COMPILER_IS_MSVC
# define ${def_value} __declspec(align(X))
# else
# define ${def_value}
# endif
\n")
endif()
if (feature STREQUAL cxx_alignof)
set(def_value "${prefix_arg}_ALIGNOF(X)")
string(APPEND file_content "
# if defined(${def_name}) && ${def_name}
# define ${def_value} alignof(X)
# elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
# define ${def_value} __alignof__(X)
# elif ${prefix_arg}_COMPILER_IS_MSVC
# define ${def_value} __alignof(X)
# endif
\n")
endif()
_simpledefine(cxx_deleted_functions DELETED_FUNCTION "= delete" "")
_simpledefine(cxx_extern_templates EXTERN_TEMPLATE extern "")
if (feature STREQUAL cxx_noexcept)
set(def_value "${prefix_arg}_NOEXCEPT")
string(APPEND file_content "
# if defined(${def_name}) && ${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")
string(APPEND file_content "
# if defined(${def_name}) && ${def_name}
# define ${def_value} nullptr
# elif ${prefix_arg}_COMPILER_IS_GNU
# define ${def_value} __null
# else
# define ${def_value} 0
# endif
\n")
endif()
if (feature STREQUAL cxx_thread_local)
set(def_value "${prefix_arg}_THREAD_LOCAL")
string(APPEND file_content "
# if defined(${def_name}) && ${def_name}
# define ${def_value} thread_local
# elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang || ${prefix_arg}_COMPILER_IS_AppleClang
# define ${def_value} __thread
# elif ${prefix_arg}_COMPILER_IS_MSVC
# define ${def_value} __declspec(thread)
# else
// ${def_value} not defined for this configuration.
# endif
\n")
endif()
if (feature STREQUAL cxx_attribute_deprecated)
set(def_name ${prefix_arg}_${feature_PP})
set(def_value "${prefix_arg}_DEPRECATED")
string(APPEND file_content "
# ifndef ${def_value}
# if defined(${def_name}) && ${def_name}
# define ${def_value} [[deprecated]]
# define ${def_value}_MSG(MSG) [[deprecated(MSG)]]
# elif ${prefix_arg}_COMPILER_IS_GNU || ${prefix_arg}_COMPILER_IS_Clang
# define ${def_value} __attribute__((__deprecated__))
# define ${def_value}_MSG(MSG) __attribute__((__deprecated__(MSG)))
# elif ${prefix_arg}_COMPILER_IS_MSVC
# define ${def_value} __declspec(deprecated)
# define ${def_value}_MSG(MSG) __declspec(deprecated(MSG))
# else
# define ${def_value}
# define ${def_value}_MSG(MSG)
# endif
# endif
\n")
endif()
endforeach()
foreach(feature ${${_lang}_bare_features})
string(TOUPPER ${feature} feature_upper)
set(feature_PP "COMPILER_${feature_upper}")
set(def_name ${prefix_arg}_${feature_PP})
_simplebaredefine(c_restrict restrict "")
_simplebaredefine(cxx_constexpr constexpr "")
_simplebaredefine(cxx_final final "")
_simplebaredefine(cxx_override override "")
if (feature STREQUAL cxx_nullptr)
set(def_value "nullptr")
string(APPEND file_content "
# if !(defined(${def_name}) && ${def_name})
# if ${prefix_arg}_COMPILER_IS_GNU
# define ${def_value} __null
# else
# define ${def_value} 0
# endif
# endif
\n")
endif()
_simplebaredefine(cxx_noexcept noexcept "")
endforeach()
string(APPEND file_content "#endif\n")
endforeach()
if(_WCD_OUTPUT_FILES_VAR)
foreach(compiler ${_WCD_COMPILERS})
foreach(_lang ${_langs})
if(compiler_file_content_${compiler}_${_lang})
set(CMAKE_CONFIGURABLE_FILE_CONTENT "${compiler_file_content_}")
string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT "${compiler_file_content_${compiler}_${_lang}}")
set(compile_file_name "${_WCD_OUTPUT_DIR}${prefix_arg}_COMPILER_INFO_${compiler}_${_lang}.h")
set(full_path "${main_file_dir}/${compile_file_name}")
list(APPEND ${_WCD_OUTPUT_FILES_VAR} ${full_path})
configure_file("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
"${full_path}"
@ONLY
)
endif()
endforeach()
endforeach()
set(${_WCD_OUTPUT_FILES_VAR} ${${_WCD_OUTPUT_FILES_VAR}} PARENT_SCOPE)
endif()
if (_WCD_EPILOG)
string(APPEND file_content "\n${_WCD_EPILOG}\n")
endif()
string(APPEND file_content "\n#endif")
set(CMAKE_CONFIGURABLE_FILE_CONTENT ${file_content})
configure_file("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
"${file_arg}"
@ONLY
)
endfunction()
