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[core] Reduce size of libCling #20019

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Merged
merged 2 commits into from
Oct 6, 2025
Merged

[core] Reduce size of libCling #20019

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2fa3ef2
[core] Garbage collect unused sections in libCling
hahnjo Oct 1, 2025
99ee373
[core] Strip libCling after build
hahnjo Oct 1, 2025
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9 changes: 9 additions & 0 deletions core/metacling/src/CMakeLists.txt
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Expand Up @@ -229,8 +229,17 @@ if(NOT APPLE AND NOT MSVC)
# and by ALICE in https://github.com/root-project/root/issues/19889
# Only needed for Linux: Mac uses linker namespaces and Windows explicit export/import
target_link_libraries(Cling PRIVATE -Wl,-Bsymbolic)
# We compile with -fvisibility=hidden in interpreter/, but some symbols of
# instantiated templates remain. Use a version script to hide them.
target_link_libraries(Cling PRIVATE -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libCling.script)
set_target_properties(Cling PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libCling.script)
# After inlining and hiding symbols, some of them are not referenced anymore
# and can be collected by the linker, reducing the library size.
target_link_libraries(Cling PRIVATE -Wl,--gc-sections)
# Additionally, for Release builds, strip the binary to remove symbol tables.
add_custom_command(TARGET Cling POST_BUILD
COMMAND $<$<CONFIG:Release>:${CMAKE_STRIP}>
ARGS $<TARGET_FILE:Cling>)
endif()

if (CMAKE_SYSTEM_NAME MATCHES FreeBSD)
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