Commit a53cf690 authored by Brad King's avatar Brad King
Browse files

Features: Record C features for MSVC

The MSVC C compiler has no notion of C language standards or flags.
Tell CMake to assume that all language standards are available.
Record available C language features depending on the version of
the compiler.

Fixes: #17858
parent e62dfecc
features-msvc-c
---------------
* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
is now aware of the availability of C features in MSVC since VS 2010.
set(_cmake_oldestSupported "_MSC_VER >= 1600")
# Not yet supported:
#set(_cmake_feature_test_c_static_assert "")
#set(_cmake_feature_test_c_restrict "")
set(_cmake_feature_test_c_variadic_macros "${_cmake_oldestSupported}")
set(_cmake_feature_test_c_function_prototypes "${_cmake_oldestSupported}")
# MSVC has no specific options to set C language standards, but set them as
# empty strings anyways so the feature test infrastructure can at least check
# to see if they are defined.
set(CMAKE_C90_STANDARD_COMPILE_OPTION "")
set(CMAKE_C90_EXTENSION_COMPILE_OPTION "")
set(CMAKE_C99_STANDARD_COMPILE_OPTION "")
set(CMAKE_C99_EXTENSION_COMPILE_OPTION "")
set(CMAKE_C11_STANDARD_COMPILE_OPTION "")
set(CMAKE_C11_EXTENSION_COMPILE_OPTION "")
# There is no meaningful default for this
set(CMAKE_C_STANDARD_DEFAULT "")
# There are no C compiler modes so we only need to test features once.
# 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
)
_record_compiler_features(C "" CMAKE_C_COMPILE_FEATURES)
endmacro()
cmake_minimum_required(VERSION 3.0)
cmake_policy(SET CMP0057 NEW)
cmake_minimum_required(VERSION 3.3)
project(target_compile_features)
set(CMAKE_VERBOSE_MAKEFILE ON)
......@@ -19,7 +18,8 @@ if (c_restrict IN_LIST CMAKE_C_COMPILE_FEATURES)
target_link_libraries(c_restrict_user_specific c_lib_restrict_specific)
endif()
if (c_std_99 IN_LIST CMAKE_C_COMPILE_FEATURES)
if (c_std_99 IN_LIST CMAKE_C_COMPILE_FEATURES AND
NOT "${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC")
add_executable(c_target_compile_features_meta main.c)
target_compile_features(c_target_compile_features_meta
PRIVATE c_std_99
......
......@@ -254,6 +254,11 @@ if (C_expected_features)
EXPECT_C_STATIC_ASSERT=0
)
endif()
elseif(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
list(APPEND expected_defs
EXPECT_C_RESTRICT=0
EXPECT_C_STATIC_ASSERT=0
)
elseif (CMAKE_C_COMPILER_ID STREQUAL "SunPro")
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.13)
list(APPEND expected_defs
......
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