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[Win] Add opt-in Release size optimization #8803

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[Win] Add opt-in Release size optimization #8803

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2 changes: 2 additions & 0 deletions CMakeLists.txt
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Expand Up @@ -98,6 +98,8 @@ mark_as_advanced(DXC_DISABLE_ALLOCATOR_OVERRIDES)
option(DXC_CODEGEN_EXCEPTIONS_TRAP "An exception in code generation generates a trap, ending the compiler process" OFF)
mark_as_advanced(DXC_CODEGEN_EXCEPTIONS_TRAP)

option(DXC_OPTIMIZE_FOR_SIZE "Favor smaller Windows Release binaries over compiler throughput" OFF)

# adjust link option to enable debugging from kernel mode; not compatible with incremental linking
if(NOT CMAKE_VERSION VERSION_LESS "3.13" AND MSVC AND NOT CMAKE_C_COMPILER_ARCHITECTURE_ID STREQUAL "ARM64EC")
add_link_options(/DEBUGTYPE:CV,FIXUP,PDATA /INCREMENTAL:NO)
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4 changes: 4 additions & 0 deletions cmake/modules/HandleLLVMOptions.cmake
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Expand Up @@ -370,6 +370,10 @@ if( MSVC )
append("/DEBUG /OPT:REF" CMAKE_EXE_LINKER_FLAGS_RELEASE)
endif()

if (DXC_OPTIMIZE_FOR_SIZE)
append("/Os" CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_RELEASE)
endif()

# HLSL Changes End

# Enable warnings
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