mirror of https://git.tukaani.org/xz.git
Build: Don't put GNU/Linux-specific symbol versions into static liblzma.
It not only makes no sense to put symbol versions into a static library but it can also cause breakage. By default Libtool #defines PIC if building a shared library and doesn't define it for static libraries. This is documented in the Libtool manual. It can be overriden using --with-pic or --without-pic. configure.ac detects if --with-pic or --without-pic is used and then gives an error if neither --disable-shared nor --disable-static was used at the same time. Thus, in normal situations it works to build both shared and static library at the same time on GNU/Linux, only --with-pic or --without-pic requires that only one type of library is built. Thanks to John Paul Adrian Glaubitz from Debian for reporting the problem that occurred on ia64: https://www.mail-archive.com/xz-devel@tukaani.org/msg00610.html
This commit is contained in:
Lasse Collin
parent
e1acf71072
commit
06824396b2
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@ -477,7 +477,10 @@ elseif(BUILD_SHARED_LIBS AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
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# because it would put symbol versions into the static library which
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# can cause problems. It's clearer if all symver related things are
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# omitted when not building a shared library.
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target_compile_definitions(liblzma PRIVATE HAVE_SYMBOL_VERSIONS_LINUX)
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#
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# NOTE: Set it explicitly to 1 to make it clear that versioning is
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# done unconditionally in the C files.
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target_compile_definitions(liblzma PRIVATE HAVE_SYMBOL_VERSIONS_LINUX=1)
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target_link_options(liblzma PRIVATE
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"-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma_linux.map"
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)
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143
configure.ac
143
configure.ac
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@ -520,54 +520,6 @@ AC_ARG_ENABLE([doc], [AS_HELP_STRING([--disable-doc],
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AM_CONDITIONAL([COND_DOC], [test x$enable_doc != xno])
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#####################
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# Symbol versioning #
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#####################
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AC_MSG_CHECKING([if library symbol versioning should be used])
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AC_ARG_ENABLE([symbol-versions], [AS_HELP_STRING([--enable-symbol-versions],
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[Use symbol versioning for liblzma. Enabled by default on
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GNU/Linux, other GNU-based systems, and FreeBSD.])],
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[], [enable_symbol_versions=auto])
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if test "x$enable_symbol_versions" = xauto; then
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case $host_os in
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# NOTE: Even if one omits -gnu on GNU/Linux (e.g.
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# i486-slackware-linux), configure will (via config.sub)
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# append -gnu (e.g. i486-slackware-linux-gnu), and this
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# test will work correctly.
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gnu* | *-gnu* | freebsd*)
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enable_symbol_versions=yes
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;;
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*)
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enable_symbol_versions=no
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;;
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esac
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fi
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AC_MSG_RESULT([$enable_symbol_versions])
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# There are two variants for symbol versioning.
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# See src/liblzma/validate_map.sh for details.
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if test "x$enable_symbol_versions" = xyes; then
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case $host_os in
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linux*)
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enable_symbol_versions=linux
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AC_DEFINE([HAVE_SYMBOL_VERSIONS_LINUX], [1],
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[Define to 1 to if GNU/Linux-specific details
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are wanted for symbol versioning. This must
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be used together with liblzma_linux.map.])
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;;
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*)
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enable_symbol_versions=generic
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;;
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esac
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fi
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AM_CONDITIONAL([COND_SYMVERS_LINUX],
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[test "x$enable_symbol_versions" = xlinux])
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AM_CONDITIONAL([COND_SYMVERS_GENERIC],
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[test "x$enable_symbol_versions" = xgeneric])
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##############
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# Sandboxing #
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##############
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@ -715,6 +667,101 @@ LT_LANG([Windows Resource])
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# libs as shared.
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AM_CONDITIONAL([COND_SHARED], [test "x$enable_shared" != xno])
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#####################
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# Symbol versioning #
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#####################
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# NOTE: This checks if we are building shared or static library
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# and if --with-pic or --without-pic was used. Thus this check
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# must be after Libtool initialization.
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AC_MSG_CHECKING([if library symbol versioning should be used])
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AC_ARG_ENABLE([symbol-versions], [AS_HELP_STRING([--enable-symbol-versions],
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[Use symbol versioning for liblzma. Enabled by default on
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GNU/Linux, other GNU-based systems, and FreeBSD.])],
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[], [enable_symbol_versions=auto])
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if test "x$enable_symbol_versions" = xauto; then
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case $host_os in
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# NOTE: Even if one omits -gnu on GNU/Linux (e.g.
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# i486-slackware-linux), configure will (via config.sub)
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# append -gnu (e.g. i486-slackware-linux-gnu), and this
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# test will work correctly.
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gnu* | *-gnu* | freebsd*)
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enable_symbol_versions=yes
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;;
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*)
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enable_symbol_versions=no
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;;
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esac
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fi
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# There are two variants for symbol versioning.
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# See src/liblzma/validate_map.sh for details.
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#
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# On GNU/Linux, extra symbols are added in the C code. These extra symbols
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# must not be put into a static library as they can cause problems (and
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# even if they didn't cause problems, they would be useless). On other
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# systems symbol versioning may be used too but there is no problem as only
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# a linker script is specified in src/liblzma/Makefile.am and that isn't
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# used when creating a static library.
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#
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# Libtool always uses -DPIC when building shared libraries by default and
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# doesn't use it for static libs by default. This can be overriden with
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# --with-pic and --without-pic though. As long as neither --with-pic nor
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# --without-pic is used then we can use #ifdef PIC to detect if the file is
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# being built for a shared library.
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if test "x$enable_symbol_versions" = xno ; then
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enable_symbol_versions=no
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AC_MSG_RESULT([no])
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elif test "x$enable_shared" = xno ; then
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enable_symbol_versions=no
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AC_MSG_RESULT([no (not building a shared library)])
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else
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case $host_os in
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linux*)
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case "$pic_mode-$enable_static" in
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default-*)
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# Use symvers if PIC is defined.
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have_symbol_versions_linux=2
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;;
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*-no)
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# Not building static library.
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# Use symvers unconditionally.
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have_symbol_versions_linux=1
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;;
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*)
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AC_MSG_RESULT([])
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AC_MSG_ERROR([
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On GNU/Linux, building both shared and static library at the same time
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is not supported if --with-pic or --without-pic is used.
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Use either --disable-shared or --disable-static to build one type
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of library at a time. If both types are needed, build one at a time,
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possibly picking only src/liblzma/.libs/liblzma.a from the static build.])
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;;
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esac
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enable_symbol_versions=linux
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AC_DEFINE_UNQUOTED([HAVE_SYMBOL_VERSIONS_LINUX],
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[$have_symbol_versions_linux],
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[Define to 1 to if GNU/Linux-specific details
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are unconditionally wanted for symbol
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versioning. Define to 2 to if these are wanted
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only if also PIC is defined (allows building
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both shared and static liblzma at the same
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time with Libtool if neither --with-pic nor
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--without-pic is used). This define must be
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used together with liblzma_linux.map.])
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;;
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*)
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enable_symbol_versions=generic
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;;
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esac
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AC_MSG_RESULT([yes ($enable_symbol_versions)])
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fi
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AM_CONDITIONAL([COND_SYMVERS_LINUX],
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[test "x$enable_symbol_versions" = xlinux])
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AM_CONDITIONAL([COND_SYMVERS_GENERIC],
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[test "x$enable_symbol_versions" = xgeneric])
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###############################################################################
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# Checks for libraries.
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@ -34,6 +34,18 @@
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#include "lzma.h"
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// The extra symbol versioning in the C files may only be used when
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// building a shared library. If HAVE_SYMBOL_VERSIONS_LINUX is defined
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// to 2 then symbol versioning is done only if also PIC is defined.
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// By default Libtool defines PIC when building a shared library and
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// doesn't define it when building a static library but it can be
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// overriden with --with-pic and --without-pic. configure let's rely
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// on PIC if neither --with-pic or --without-pic was used.
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#if defined(HAVE_SYMBOL_VERSIONS_LINUX) \
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&& (HAVE_SYMBOL_VERSIONS_LINUX == 2 && !defined(PIC))
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# undef HAVE_SYMBOL_VERSIONS_LINUX
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#endif
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#ifdef HAVE_SYMBOL_VERSIONS_LINUX
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// To keep link-time optimization (LTO, -flto) working with GCC,
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// the __symver__ attribute must be used instead of __asm__(".symver ...").
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