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Clang: Avoid extra C++ feature detection when simulating MSVC

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Apply the optimization from commit v3.10.0-rc1~131^2 (MSVC: Avoid
unnecessary C++ feature detection steps, 2017-09-11) to the case of
Clang simulating a version of MSVC that does not define standards.

Issue: #17274
This commit is contained in:
Brad King
2018-04-11 14:46:09 -04:00
parent 6cddf7ba32
commit 8381bc12ad
1 changed files with 15 additions and 0 deletions
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15
Modules/Compiler/Clang-CXX.cmake
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@@ -70,4 +70,19 @@ else()
# There is no meaningful default for this
set(CMAKE_CXX_STANDARD_DEFAULT "")
# There are no 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_cxx_compile_features)
list(APPEND CMAKE_CXX_COMPILE_FEATURES
cxx_std_98
cxx_std_11
cxx_std_14
cxx_std_17
cxx_std_20
)
_record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES)
endmacro()
endif()