1include(Compiler/Clang)
2__compiler_clang(C)
3
4cmake_policy(GET CMP0025 appleClangPolicy)
5if(APPLE AND NOT appleClangPolicy STREQUAL NEW)
6  return()
7endif()
8
9if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC")
10  set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TC)
11  set(CMAKE_C_CLANG_TIDY_DRIVER_MODE "cl")
12  set(CMAKE_C_INCLUDE_WHAT_YOU_USE_DRIVER_MODE "cl")
13  if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
14      AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
15      AND CMAKE_DEPFILE_FLAGS_C)
16    set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
17  endif()
18elseif("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
19  set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c)
20  if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
21      AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
22      AND CMAKE_DEPFILE_FLAGS_C)
23    # dependencies are computed by the compiler itself
24    set(CMAKE_C_DEPFILE_FORMAT gcc)
25    set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
26  endif()
27endif()
28
29if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
30  if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 2.1)
31    set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
32    set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
33
34    set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
35    set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
36  endif()
37
38  if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.1)
39    set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
40    set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
41  elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.0)
42    set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c1x")
43    set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu1x")
44  endif()
45
46  if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 6.0)
47    set(CMAKE_C17_STANDARD_COMPILE_OPTION "-std=c17")
48    set(CMAKE_C17_EXTENSION_COMPILE_OPTION "-std=gnu17")
49  endif()
50
51  if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 9.0)
52    set(CMAKE_C23_STANDARD_COMPILE_OPTION "-std=c2x")
53    set(CMAKE_C23_EXTENSION_COMPILE_OPTION "-std=gnu2x")
54  endif()
55else()
56  set(CMAKE_C90_STANDARD_COMPILE_OPTION "")
57  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "")
58  set(CMAKE_C99_STANDARD_COMPILE_OPTION "")
59  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "")
60
61  if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 13.0)
62    set(CMAKE_C11_STANDARD_COMPILE_OPTION "/std:c11")
63    set(CMAKE_C11_EXTENSION_COMPILE_OPTION "/std:c11")
64
65    set(CMAKE_C17_STANDARD_COMPILE_OPTION "/std:c17")
66    set(CMAKE_C17_EXTENSION_COMPILE_OPTION "/std:c17")
67  else()
68    set(CMAKE_C11_STANDARD_COMPILE_OPTION "")
69    set(CMAKE_C11_EXTENSION_COMPILE_OPTION "")
70
71    set(CMAKE_C17_STANDARD_COMPILE_OPTION "")
72    set(CMAKE_C17_EXTENSION_COMPILE_OPTION "")
73  endif()
74endif()
75
76if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 2.1)
77  set(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT ON)
78  set(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT ON)
79endif()
80
81if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 3.0)
82  set(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT ON)
83endif()
84
85__compiler_check_default_language_standard(C 2.1 99 3.5.2 11 11.0 17)
86