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MSVC: Add flags for C++ language standards

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Visual Studio 2015 Update 3 introduced the notion of language standard
levels to MSVC.  The language standard level is defined in `_MSVC_LANG`
instead of `__cplusplus`.  It also added support for the `-std:c++14`
and `-std:c++latest` flags, although the compiler defaults to its C++14
mode anyway.  Visual Studio 2017 Update 3 will introduce support for the
`-std:c++17` flag.

Fixes: #16482
This commit is contained in:
Brad King
2017-07-14 09:17:05 -04:00
parent cef77f0687
commit 131c721f54
3 changed files with 42 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
Modules/CMakeCXXCompilerId.cpp.in
View File

@@ -27,12 +27,18 @@ char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
@CMAKE_CXX_COMPILER_ID_PLATFORM_CONTENT@
@CMAKE_CXX_COMPILER_ID_ERROR_FOR_TEST@
#if defined(_MSC_VER) && defined(_MSVC_LANG)
#define CXX_STD _MSVC_LANG
#else
#define CXX_STD __cplusplus
#endif
const char* info_language_dialect_default = "INFO" ":" "dialect_default["
#if __cplusplus > 201402L
#if CXX_STD > 201402L
"17"
#elif __cplusplus >= 201402L
#elif CXX_STD >= 201402L
"14"
#elif __cplusplus >= 201103L
#elif CXX_STD >= 201103L
"11"
#else
"98"

20
Modules/Compiler/MSVC-CXX.cmake
View File

@@ -3,7 +3,25 @@
include(Compiler/CMakeCommonCompilerMacros)
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.10.25017)
# VS 2015 Update 3 and above support language standard level flags,
# with the default and minimum level being C++14.
set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "")
set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "")
set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std:c++14")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std:c++14")
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.11.25505)
set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++17")
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++17")
else()
set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++latest")
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++latest")
endif()
__compiler_check_default_language_standard(CXX 19.0 14)
elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0)
# MSVC has no specific options to set language standards, but set them as
# empty strings anyways so the feature test infrastructure can at least check
# to see if they are defined.

23
Tests/CompileFeatures/default_dialect.cpp
View File

@@ -2,25 +2,30 @@
template <long l>
struct Outputter;
#if defined(_MSC_VER) && defined(_MSVC_LANG)
#define CXX_STD _MSVC_LANG
#else
#define CXX_STD __cplusplus
#endif
#if DEFAULT_CXX17
#if __cplusplus <= 201402L
Outputter<__cplusplus> o;
#if CXX_STD <= 201402L
Outputter<CXX_STD> o;
#endif
#elif DEFAULT_CXX14
#if __cplusplus != 201402L
Outputter<__cplusplus> o;
#if CXX_STD != 201402L
Outputter<CXX_STD> o;
#endif
#elif DEFAULT_CXX11
#if __cplusplus != 201103L
Outputter<__cplusplus> o;
#if CXX_STD != 201103L
Outputter<CXX_STD> o;
#endif
#else
#if !DEFAULT_CXX98
#error Buildsystem error
#endif
#if __cplusplus != 199711L && __cplusplus != 1 && \
!defined(__GXX_EXPERIMENTAL_CXX0X__)
Outputter<__cplusplus> o;
#if CXX_STD != 199711L && CXX_STD != 1 && !defined(__GXX_EXPERIMENTAL_CXX0X__)
Outputter<CXX_STD> o;
#endif
#endif