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MSVC: Refactor C compile features table for C90, C99, and C11

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The custom "no modes" `cmake_record_c_compile_features` implementation
should only be used in `cl` versions prior to 19.27 because they had no
`-std:c*` flags for C standards.  For 19.27 we need a different custom
implementation to account for partial C11 support.  For 19.28 and above
we can use the default implementation through the `*__HAS_FULL_SUPPORT`
settings.

We already use this pattern in the MSVC C++ compile feature table.
This commit is contained in:
Brad King
2021-10-28 12:10:33 -04:00
parent 28a033cc7d
commit 22f804e0ec
1 changed files with 35 additions and 29 deletions
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64
Modules/Compiler/MSVC-C.cmake
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@ -11,6 +11,20 @@ if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.27)
set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std:c11")
set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std:c11")
if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.28)
set(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT ON)
set(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT ON)
set(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT ON)
else()
# Special case for 19.27 (VS 16.7): C11 has partial support.
macro(cmake_record_c_compile_features)
_has_compiler_features_c(90)
_has_compiler_features_c(99)
list(APPEND CMAKE_C11_COMPILE_FEATURES c_std_11)
set(_result 0) # expected by cmake_determine_compile_features
endmacro()
endif()
__compiler_check_default_language_standard(C 19.27 99)
else()
# MSVC has no specific options to set C language standards, but set them as
@ -25,41 +39,33 @@ else()
# There is no meaningful default for this
set(CMAKE_C_STANDARD_DEFAULT "")
# There are no C compiler modes so we hard-code the known compiler supported
# features. Override the default macro for this special case. Pretend that
# all language standards are available so that at least compilation
# can be attempted.
macro(cmake_record_c_compile_features)
list(APPEND CMAKE_C_COMPILE_FEATURES
c_std_90
c_std_99
c_std_11
c_function_prototypes
)
list(APPEND CMAKE_C90_COMPILE_FEATURES c_std_90 c_function_prototypes)
list(APPEND CMAKE_C99_COMPILE_FEATURES c_std_99)
list(APPEND CMAKE_C11_COMPILE_FEATURES c_std_11)
if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 14.0)
list(APPEND CMAKE_C_COMPILE_FEATURES c_variadic_macros)
list(APPEND CMAKE_C99_COMPILE_FEATURES c_variadic_macros)
endif()
set(_result 0) # expected by cmake_determine_compile_features
endmacro()
endif()
set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TC)
set(CMAKE_C_CLANG_TIDY_DRIVER_MODE "cl")
set(CMAKE_C_INCLUDE_WHAT_YOU_USE_DRIVER_MODE "cl")
# There are no C compiler modes so we hard-code the known compiler supported
# features. Override the default macro for this special case. Pretend that
# all language standards are available so that at least compilation
# can be attempted.
macro(cmake_record_c_compile_features)
list(APPEND CMAKE_C_COMPILE_FEATURES
c_std_90
c_std_99
c_std_11
c_function_prototypes
)
list(APPEND CMAKE_C90_COMPILE_FEATURES c_std_90 c_function_prototypes)
list(APPEND CMAKE_C99_COMPILE_FEATURES c_std_99)
list(APPEND CMAKE_C11_COMPILE_FEATURES c_std_11)
if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 14.0)
list(APPEND CMAKE_C_COMPILE_FEATURES c_variadic_macros)
list(APPEND CMAKE_C99_COMPILE_FEATURES c_variadic_macros)
endif()
if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.27)
list(APPEND CMAKE_C_COMPILE_FEATURES c_restrict)
list(APPEND CMAKE_C99_COMPILE_FEATURES c_restrict)
endif()
if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.28)
list(APPEND CMAKE_C_COMPILE_FEATURES c_static_assert)
list(APPEND CMAKE_C11_COMPILE_FEATURES c_static_assert)
endif()
set(_result 0) # expected by cmake_determine_compile_features
endmacro()
# /JMC "Just My Code" is only supported by MSVC 19.05 onward.
if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 19.05)
set(CMAKE_C_COMPILE_OPTIONS_JMC "-JMC")