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[CMake] Enable CMP0156 if available (#115046)

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Some linkers do not require that libraries are repeated on the command
line. The Apple linker emits warnings when duplicate libraries are
specified, resulting in a wall of warnings.

CMP0156 deduplicates libraries on the command line when the linker
doesn't require them.

This patch enables CMP0156 to quiet the warnings when using a version of
CMake that recognizes it (CMake 3.29 and newer).
This commit is contained in:
Evan Wilde
2024-11-06 10:34:48 -08:00
committed by GitHub
parent aae5a38e4e
commit cb90d5b3ef
1 changed files with 8 additions and 0 deletions
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8
cmake/Modules/CMakePolicy.cmake
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@@ -30,3 +30,11 @@ endif()
if(POLICY CMP0147)
cmake_policy(SET CMP0147 NEW)
endif()
# CMP0156: De-duplicate libraries on link lines based on linker capabilities.
# New in CMake 3.29: https://cmake.org/cmake/help/latest/policy/CMP0156.html
# Avoids the deluge of 'ld: warning: ignoring duplicate libraries' warnings when
# building with the Apple linker.
if(POLICY CMP0156)
cmake_policy(SET CMP0156 NEW)
endif()