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CMake: With symbol versioning, try to pass --undefined-version to linker

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Fixes: https://github.com/tukaani-project/xz/issues/180
Fixes: https://bugs.gentoo.org/956119
This commit is contained in:
Lasse Collin 2025-05-21 16:07:01 +03:00
parent 377be0ea7a
commit f023993653
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GPG Key ID: 38EE757D69184620
1 changed files with 22 additions and 0 deletions
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22
CMakeLists.txt
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@ -85,6 +85,7 @@ include(CheckSymbolExists)
include(CheckStructHasMember)
include(CheckCSourceCompiles)
include(CheckCCompilerFlag)
include(CheckLinkerFlag)
include(cmake/tuklib_large_file_support.cmake)
include(cmake/tuklib_integer.cmake)
include(cmake/tuklib_cpucores.cmake)
@ -556,6 +557,21 @@ symbol versioning (${SUPPORTED_SYMBOL_VERSIONING_VARIANTS})")
set(SYMBOL_VERSIONING "generic")
endif()
endif()
if(NOT SYMBOL_VERSIONING STREQUAL "no")
# If features are disabled in liblzma, some symbols may be missing.
# LLVM's lld defaults to --no-undefined-version and the build breaks
# if not all symbols in the version script exist. That is good for
# catching errors like typos, but in our case the downside is too big.
# Avoid the problem by using --undefined-version if the linker
# supports it.
#
# GNU ld has had --no-undefined-version for a long time but it's not
# the default. The opposite option --undefined-version was only added
# in 2022, thus we must use --undefined-version conditionally.
check_linker_flag(C "-Wl,--undefined-version"
HAVE_LINKER_FLAG_UNDEFINED_VERSION)
endif()
endif()
set(LIBLZMA_API_HEADERS
@ -1480,6 +1496,9 @@ elseif(BUILD_SHARED_LIBS AND SYMBOL_VERSIONING STREQUAL "linux")
# NOTE: Set it explicitly to 1 to make it clear that versioning is
# done unconditionally in the C files.
target_compile_definitions(liblzma PRIVATE HAVE_SYMBOL_VERSIONS_LINUX=1)
if(HAVE_LINKER_FLAG_UNDEFINED_VERSION)
target_link_options(liblzma PRIVATE "-Wl,--undefined-version")
endif()
target_link_options(liblzma PRIVATE
"-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_linux.map"
)
@ -1487,6 +1506,9 @@ elseif(BUILD_SHARED_LIBS AND SYMBOL_VERSIONING STREQUAL "linux")
LINK_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_linux.map"
)
elseif(BUILD_SHARED_LIBS AND SYMBOL_VERSIONING STREQUAL "generic")
if(HAVE_LINKER_FLAG_UNDEFINED_VERSION)
target_link_options(liblzma PRIVATE "-Wl,--undefined-version")
endif()
target_link_options(liblzma PRIVATE
"-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_generic.map"
)