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[CMake] Enable CMP0179 alongside CMP0156 for deduplication on LLD #116497

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Merged
merged 1 commit into from
Nov 21, 2024
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[CMake] Enable CMP0179 alongside CMP0156 for deduplication on LLD #116497

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9 changes: 9 additions & 0 deletions cmake/Modules/CMakePolicy.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -37,4 +37,13 @@ endif()
# building with the Apple linker.
if(POLICY CMP0156)
cmake_policy(SET CMP0156 NEW)

# CMP0179: De-duplication of static libraries on link lines keeps first occurrence.
# Dependent on CMP0156=NEW. Unifies the behaviour across platforms.
# Works around a LLD bug ELF backend bug (#116669) and required for CMP0156
# to have an effect for affected versions. Also fixes building with CMake 3.31.0,
# which lacked the workaround of ignoring CMP0156 unless this is enabled.
if(POLICY CMP0179)
cmake_policy(SET CMP0179 NEW)
endif()
endif()
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