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Clang: Add standard flags support when simulating MSVC

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When Clang 3.9 simulates MSVC 19.0 or higher it knows the `-std:` flags
that such versions of MSVC defines.

Fixes: #17866
This commit is contained in:
Ruben Van Boxem
2018-04-07 10:42:28 +02:00
committed by Brad King
parent 8381bc12ad
commit 3f82c5904d
1 changed files with 21 additions and 0 deletions
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21
Modules/Compiler/Clang-CXX.cmake
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@@ -53,6 +53,27 @@ if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
unset(_clang_version_std17)
__compiler_check_default_language_standard(CXX 2.1 98)
elseif(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 3.9
AND CMAKE_CXX_SIMULATE_VERSION VERSION_GREATER_EQUAL 19.0)
# This version of clang-cl and the MSVC version it simulates have
# support for -std: flags.
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 6.0)
set(CMAKE_CXX17_STANDARD_COMPILE_OPTION "-std:c++17")
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std:c++17")
set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "-std:c++latest")
set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std:c++latest")
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 3.9 14)
else()
# This version of clang-cl, or the MSVC version it simulates, does not have
# language standards. Set these options as empty strings so the feature