# Workaround for MSVC ARM64 performance regression: # https://developercommunity.visualstudio.com/t/Compiling-a-specific-code-for-ARM64-with/10444970 # Since /O1 and /O2 represent a set of optimizations, # our goal is to disable the /Og flag while retaining the other optimizations from the /O1|/O2 set if(MSVC AND NOT CMAKE_CXX_COMPILER_ID MATCHES Clang AND MSVC_VERSION VERSION_GREATER_EQUAL 1932 AND CMAKE_SYSTEM_PROCESSOR MATCHES "ARM64") string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE) string(REGEX MATCHALL "/[Oo][12]" opt_flags "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${uppercase_CMAKE_BUILD_TYPE}}") if (opt_flags) if(opt_flags MATCHES "1$") set(opt_flags "/Od;/Os;/Oy;/Ob2;/GF;/Gy") elseif (opt_flags MATCHES "2$") set(opt_flags "/Od;/Oi;/Ot;/Oy;/Ob2;/GF;/Gy") endif() set_source_files_properties(StandardLibrary.cpp PROPERTIES COMPILE_OPTIONS "${opt_flags}") endif() endif() add_clang_library(clangToolingInclusionsStdlib StandardLibrary.cpp LINK_LIBS clangAST )