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[CMAKE] Explicitly target Pentium for clang. CORE-17202

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The MSVC-compatible /arch:IA32 option switches to i386 mode, which
makes clang avoid 486/Pentium-specific instructions, e.g. cmpxchg8b.
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Thomas Faber 2020-08-15 21:41:32 +02:00
parent 8275c1f991
commit a81788e5bf
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1 changed files with 6 additions and 1 deletions
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7
sdk/cmake/msvc.cmake
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@ -51,7 +51,12 @@ endif()
# HACK: for VS 11+ we need to explicitly disable SSE, which is off by
# default for older compilers. See CORE-6507
if(ARCH STREQUAL "i386")
add_compile_flags("/arch:IA32")
# Clang's IA32 means i386, which doesn't have cmpxchg8b
if(USE_CLANG_CL)
add_compile_flags("-march=${OARCH}")
else()
add_compile_flags("/arch:IA32")
endif()
endif()
# VS 12+ requires /FS when used in parallel compilations