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-rw-r--r--Modules/WriteCompilerDetectionHeader.cmake130
1 files changed, 49 insertions, 81 deletions
diff --git a/Modules/WriteCompilerDetectionHeader.cmake b/Modules/WriteCompilerDetectionHeader.cmake
index 82e8fba..0b16aa4 100644
--- a/Modules/WriteCompilerDetectionHeader.cmake
+++ b/Modules/WriteCompilerDetectionHeader.cmake
@@ -20,6 +20,8 @@
# [VERSION <version>]
# [PROLOG <prolog>]
# [EPILOG <epilog>]
+# [ALLOW_UNKNOWN_COMPILERS]
+# [ALLOW_UNKNOWN_COMPILER_VERSIONS]
# )
#
# The ``write_compiler_detection_header`` function generates the
@@ -76,10 +78,16 @@
# 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.
#
+# ``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.
+#
# Feature Test Macros
# ===================
#
@@ -215,7 +223,6 @@
# CompatSupport_DEPRECATED=
# )
-include(${CMAKE_CURRENT_LIST_DIR}/CMakeParseArguments.cmake)
include(${CMAKE_CURRENT_LIST_DIR}/CMakeCompilerIdDetection.cmake)
function(_load_compiler_variables CompilerId lang)
@@ -232,6 +239,19 @@ function(_load_compiler_variables CompilerId lang)
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} ${FEATURE_DEFAULT_STRING}
+# endif
+\n")
+ endif()
+endmacro()
+
function(write_compiler_detection_header
file_keyword file_arg
prefix_keyword prefix_arg
@@ -242,7 +262,7 @@ function(write_compiler_detection_header
if (NOT "x${prefix_keyword}" STREQUAL "xPREFIX")
message(FATAL_ERROR "write_compiler_detection_header: PREFIX parameter missing.")
endif()
- set(options)
+ set(options ALLOW_UNKNOWN_COMPILERS ALLOW_UNKNOWN_COMPILER_VERSIONS)
set(oneValueArgs VERSION EPILOG PROLOG OUTPUT_FILES_VAR OUTPUT_DIR)
set(multiValueArgs COMPILERS FEATURES)
cmake_parse_arguments(_WCD "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
@@ -358,7 +378,11 @@ function(write_compiler_detection_header
endif()
foreach(feature ${_WCD_FEATURES})
- if (feature MATCHES "^cxx_")
+ if (feature MATCHES "^c_std_")
+ # ignored
+ elseif (feature MATCHES "^cxx_std_")
+ # ignored
+ elseif (feature MATCHES "^cxx_")
list(APPEND _langs CXX)
list(APPEND CXX_features ${feature})
elseif (feature MATCHES "^c_")
@@ -422,10 +446,12 @@ function(write_compiler_detection_header
set(compiler_file_content file_content)
endif()
- set(${compiler_file_content} "${${compiler_file_content}}
+ if(NOT _WCD_ALLOW_UNKNOWN_COMPILER_VERSIONS)
+ set(${compiler_file_content} "${${compiler_file_content}}
# if !(${_cmake_oldestSupported_${compiler}})
# error Unsupported compiler version
# endif\n")
+ endif()
set(PREFIX ${prefix_arg}_)
if (_need_hex_conversion)
@@ -456,67 +482,36 @@ function(write_compiler_detection_header
endforeach()
endforeach()
if(pp_if STREQUAL "elif")
- string(APPEND file_content "
+ 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})
- if (feature STREQUAL c_restrict)
- set(def_value "${prefix_arg}_RESTRICT")
- string(APPEND file_content "
-# if ${def_name}
-# define ${def_value} restrict
-# else
-# define ${def_value}
-# endif
-\n")
- endif()
- if (feature STREQUAL cxx_constexpr)
- set(def_value "${prefix_arg}_CONSTEXPR")
- string(APPEND 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}_FINAL")
- string(APPEND 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}_OVERRIDE")
- string(APPEND file_content "
-# if ${def_name}
-# define ${def_value} override
-# else
-# define ${def_value}
-# endif
-\n")
- endif()
+ _simpledefine(c_restrict RESTRICT restrict "")
+ _simpledefine(cxx_constexpr CONSTEXPR constexpr "")
+ _simpledefine(cxx_final FINAL final "")
+ _simpledefine(cxx_override OVERRIDE override "")
if (feature STREQUAL cxx_static_assert)
set(def_value "${prefix_arg}_STATIC_ASSERT(X)")
set(def_value_msg "${prefix_arg}_STATIC_ASSERT_MSG(X, MSG)")
set(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>)")
- string(APPEND file_content "# if ${def_name}\n${def_standard}\n# else\n${def_alternative}\n# endif\n\n")
+ string(APPEND file_content "# if defined(${def_name}) && ${def_name}\n${def_standard}\n# else\n${def_alternative}\n# endif\n\n")
endif()
if (feature STREQUAL cxx_alignas)
set(def_value "${prefix_arg}_ALIGNAS(X)")
string(APPEND file_content "
-# if ${def_name}
+# if defined(${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 ${def_value} __attribute__ ((__aligned__(X)))
@@ -530,7 +525,7 @@ function(write_compiler_detection_header
if (feature STREQUAL cxx_alignof)
set(def_value "${prefix_arg}_ALIGNOF(X)")
string(APPEND file_content "
-# if ${def_name}
+# if defined(${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 ${def_value} __alignof__(X)
@@ -539,30 +534,12 @@ function(write_compiler_detection_header
# endif
\n")
endif()
- if (feature STREQUAL cxx_deleted_functions)
- set(def_value "${prefix_arg}_DELETED_FUNCTION")
- string(APPEND 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")
- string(APPEND file_content "
-# if ${def_name}
-# define ${def_value} extern
-# else
-# define ${def_value}
-# endif
-\n")
- endif()
+ _simpledefine(cxx_deleted_functions DELETED_FUNCTION "= delete" "")
+ _simpledefine(cxx_extern_templates EXTERN_TEMPLATE extern "")
if (feature STREQUAL cxx_noexcept)
set(def_value "${prefix_arg}_NOEXCEPT")
string(APPEND file_content "
-# if ${def_name}
+# if defined(${def_name}) && ${def_name}
# define ${def_value} noexcept
# define ${def_value}_EXPR(X) noexcept(X)
# else
@@ -571,20 +548,11 @@ function(write_compiler_detection_header
# endif
\n")
endif()
- if (feature STREQUAL cxx_nullptr)
- set(def_value "${prefix_arg}_NULLPTR")
- string(APPEND file_content "
-# if ${def_name}
-# define ${def_value} nullptr
-# else
-# define ${def_value} 0
-# endif
-\n")
- endif()
+ _simpledefine(cxx_nullptr NULLPTR nullptr 0)
if (feature STREQUAL cxx_thread_local)
set(def_value "${prefix_arg}_THREAD_LOCAL")
string(APPEND file_content "
-# if ${def_name}
+# if defined(${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 ${def_value} __thread
@@ -600,7 +568,7 @@ function(write_compiler_detection_header
set(def_value "${prefix_arg}_DEPRECATED")
string(APPEND file_content "
# ifndef ${def_value}
-# if ${def_name}
+# if defined(${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
generated by cgit v0.12 at 2025-01-23 01:49:54 (GMT)