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Clang: Use -imsvc for system include only with MSVC-like front-end

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In commit bb61c2d024 (Clang: use -imsvc for system include dirs when
running on Windows, 2020-09-16, v3.19.0-rc1~162^2) we added `-imsvc`
for all Clang compilers targeting the MSVC ABI.  However, the option
only exists for the MSVC-like front-end.  The GNU-like front-ends
use `-isystem`.

Fixes: #21789
This commit is contained in:
Brad King
2021-02-09 11:24:41 -05:00
parent 340ca27f8d
commit 2fc5e5dba9
2 changed files with 1 additions and 1 deletions
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Modules/Compiler/Clang.cmake
-1
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@@ -19,7 +19,6 @@ if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
OR "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC"
OR "x${CMAKE_Fortran_SIMULATE_ID}" STREQUAL "xMSVC")
macro(__compiler_clang lang)
set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-imsvc ")
endmacro()
else()
include(Compiler/GNU)