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Build: 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 ff49c82176
commit 377be0ea7a
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GPG Key ID: 38EE757D69184620
2 changed files with 25 additions and 0 deletions
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23
configure.ac
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@ -758,6 +758,7 @@ fi
# --with-pic and --without-pic though. As long as neither --with-pic nor
# --without-pic is used then we can use #ifdef PIC to detect if the file is
# being built for a shared library.
LINKER_FLAG_UNDEFINED_VERSION=
AS_IF([test "x$enable_symbol_versions" = xno], [
enable_symbol_versions=no
AC_MSG_RESULT([no])
@ -831,12 +832,34 @@ AS_IF([test "x$enable_symbol_versions" = xno], [
AC_MSG_ERROR([unknown symbol versioning variant '$enable_symbol_versions'])
fi
AC_MSG_RESULT([yes ($enable_symbol_versions)])
# 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.
AC_MSG_CHECKING([if linker supports --undefined-version])
OLD_LDFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -Wl,--undefined-version"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void) { return 0; }]])], [
LINKER_FLAG_UNDEFINED_VERSION=-Wl,--undefined-version
AC_MSG_RESULT([yes])
], [
AC_MSG_RESULT([no])
])
LDFLAGS=$OLD_LDFLAGS
])
AM_CONDITIONAL([COND_SYMVERS_LINUX],
[test "x$enable_symbol_versions" = xlinux])
AM_CONDITIONAL([COND_SYMVERS_GENERIC],
[test "x$enable_symbol_versions" = xgeneric])
AC_SUBST([LINKER_FLAG_UNDEFINED_VERSION])
###############################################################################

2
src/liblzma/Makefile.am
View File

@ -25,10 +25,12 @@ liblzma_la_LDFLAGS = -no-undefined -version-info 13:1:8
EXTRA_DIST += liblzma_generic.map liblzma_linux.map validate_map.sh
if COND_SYMVERS_GENERIC
liblzma_la_LDFLAGS += \
$(LINKER_FLAG_UNDEFINED_VERSION) \
-Wl,--version-script=$(top_srcdir)/src/liblzma/liblzma_generic.map
endif
if COND_SYMVERS_LINUX
liblzma_la_LDFLAGS += \
$(LINKER_FLAG_UNDEFINED_VERSION) \
-Wl,--version-script=$(top_srcdir)/src/liblzma/liblzma_linux.map
endif