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Clang: Refactor standard flags logic when simulating MSVC

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Consolidate the compile options and standard defaults branches.
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This commit is contained in:
Brad King
2018-04-11 14:44:04 -04:00
parent aad0967e7d
commit 6cddf7ba32
1 changed files with 6 additions and 5 deletions
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11
Modules/Compiler/Clang-CXX.cmake
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@@ -51,8 +51,12 @@ if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
endif()
unset(_clang_version_std17)
__compiler_check_default_language_standard(CXX 2.1 98)
else()
# clang-cl does not know these options because it behaves like cl.exe
# This version of clang-cl, or the MSVC version it simulates, does not have
# language standards. Set these options as empty strings so the feature
# test infrastructure can at least check to see if they are defined.
set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "")
@@ -63,10 +67,7 @@ else()
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "")
set(CMAKE_CXX20_STANDARD_COMPILE_OPTION "")
set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "")
endif()
if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
__compiler_check_default_language_standard(CXX 2.1 98)
else()
# There is no meaningful default for this
set(CMAKE_CXX_STANDARD_DEFAULT "")
endif()