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Globally enable linker dead-code elimination on Unix #128232

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Globally enable linker dead-code elimination on Unix #128232

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6cdbb14
Globally enable linker dead-code elimination on Unix
Copilot May 14, 2026
41177a5
Update eng/native/configurecompiler.cmake
elinor-fung May 15, 2026
1b6ca52
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elinor-fung May 15, 2026
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16 changes: 15 additions & 1 deletion eng/native/configurecompiler.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -321,6 +321,17 @@ if(CLR_CMAKE_HOST_UNIX)
endforeach()
endif(CLR_CMAKE_HOST_UNIX)

# Strip unreferenced sections at link time, paired with -ffunction-sections/-fdata-sections
# (set in the Unix/WASI compile-options block below). Gated to non-Debug builds so Debug
# keeps full symbols and incremental linking. Windows uses /OPT:REF, configured above.
if(CLR_CMAKE_HOST_UNIX)
if(CLR_CMAKE_HOST_APPLE)
add_linker_flag(-Wl,-dead_strip CHECKED RELEASE RELWITHDEBINFO)
else()
add_linker_flag(-Wl,--gc-sections CHECKED RELEASE RELWITHDEBINFO)
endif()
endif()
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Comment on lines +324 to +333
Comment on lines +327 to +333

if(CLR_CMAKE_HOST_LINUX)
add_compile_options($<$<COMPILE_LANGUAGE:ASM>:-Wa,--noexecstack>)
add_linker_flag(-Wl,--build-id=sha1)
Expand Down Expand Up @@ -740,8 +751,11 @@ if (CLR_CMAKE_HOST_UNIX OR CLR_CMAKE_HOST_WASI)
# We mark the function which needs exporting with DLLEXPORT
add_compile_options(-fvisibility=hidden)

# Separate functions so linker can remove them.
# Separate functions and data into their own sections so the linker can remove
# unreferenced ones via --gc-sections (ELF) / -dead_strip (Mach-O), which are
# enabled earlier in this file for non-Debug configurations.
add_compile_options(-ffunction-sections)
add_compile_options(-fdata-sections)

# Specify the minimum supported version of macOS
# Mac Catalyst needs a special CFLAG, exclusive with mmacosx-version-min
Expand Down
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