share/cmake-3.23/Modules/Compiler/GNU-C.cmake

include(Compiler/GNU)
__compiler_gnu(C)


if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
    AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
    AND CMAKE_DEPFILE_FLAGS_C)
  # dependencies are computed by the compiler itself
  set(CMAKE_C_DEPFILE_FORMAT gcc)
  set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
endif()

set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c)

if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5)
  set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
  set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c89")
  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu89")
endif()

if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
  set(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT ON)
  set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
  set(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT ON)
endif()

if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7)
  set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
  set(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT ON)
elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
  set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c1x")
  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu1x")
endif()

if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 8.1)
  set(CMAKE_C17_STANDARD_COMPILE_OPTION "-std=c17")
  set(CMAKE_C17_EXTENSION_COMPILE_OPTION "-std=gnu17")
endif()

if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 9.1)
  set(CMAKE_C23_STANDARD_COMPILE_OPTION "-std=c2x")
  set(CMAKE_C23_EXTENSION_COMPILE_OPTION "-std=gnu2x")
endif()

__compiler_check_default_language_standard(C 3.4 90 5.0 11 8.1 17)