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Build: enable /OPT:REF for MSVC RelWithDebInfo #1833

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Merged
bkaradzic-microsoft merged 2 commits into from
Aug 12, 2026
Merged

Build: enable /OPT:REF for MSVC RelWithDebInfo #1833

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631f31c
Build: enable /OPT:REF for MSVC RelWithDebInfo
bkaradzic Aug 12, 2026
b66c234
Build: use add_link_options with a config generator expression
bkaradzic Aug 12, 2026
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14 changes: 14 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -373,6 +373,20 @@ if(MSVC)

# Enable multiprocessor compilation for faster builds
add_compile_options(/MP)

# Strip unreferenced code from RelWithDebInfo binaries.
#
# MSVC turns /OPT:REF and /OPT:ICF off whenever /DEBUG is passed, and CMake's
# default RelWithDebInfo link flags are "/debug /INCREMENTAL". The effect is that
# RelWithDebInfo keeps every unreferenced COMDAT that made it into the static
# libraries.
#
# /OPT:REF alone captures the entire win (/OPT:ICF measured zero additional
# bytes), so identical functions are left unfolded and stack traces stay
# unambiguous. Incremental linking must be off because it is incompatible with
# /OPT:REF. Debug is left untouched, and Release/MinSizeRel already get /OPT:REF
# implicitly because they do not link with /DEBUG.
add_link_options($<$<CONFIG:RelWithDebInfo>:/INCREMENTAL:NO> $<$<CONFIG:RelWithDebInfo>:/OPT:REF>)
endif()

if(NOT ENABLE_RTTI)
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