As Ulrich Drepper has commented (in
<http://people.redhat.com/drepper/dsohowto.pdf>), libtool's support for
non-exported symbol visibility on GNU/Linux could do with
improvement. Presently, if you specify an -export-symbols file, libtool
converts it into a -Wl,-retain-symbols-file argument to $CC. This is
hardly ideal, as --retain-symbols-file doesn't actually affect the
visibility of symbols at runtime at all!
The right thing to do is to use a version script. Luckily, the code to
do this is already present for Solaris without GNU ld; all that is
needed is to use a similar construction for GNU/Linux as well.
Therefore, a patch, against CVS HEAD (KCC and Compaq C++ parts
untested). (I'd write a testcase too but I'm not sure how you suppress
running single testcases, and we'd need to suppress this one for the
non-GNU/Linux, non-Solaris case.)
(A patch against 1.4d is also available; the patch below applies
fine, except for trivial adjustments in the KCC parts.)
(It may also be a good idea to add this for other platforms,
particularly Solaris with GNU/ld, for which it would be a matter of
deleting one conditional; but I can't test this at all, so I didn't do
it.)
2003-02-01 Nix <[EMAIL PROTECTED]>
* libtool.m4 (AC_LIBTOOL_PROG_LD_SHLIBS): Use version scripts
under GNU/Linux.
(AC_LIBTOOL_LANG_CXX_CONFIG): Likewise for KCC and Compaq C++.
Index: latest/libtool.m4
===================================================================
RCS file: /cvsroot/libtool/libtool/libtool.m4,v
retrieving revision 1.293
diff -u -r1.293 libtool.m4
--- latest/libtool.m4 29 Jan 2003 04:57:52 -0000 1.293
+++ latest/libtool.m4 1 Feb 2003 03:04:20 -0000
@@ -2960,7 +2960,8 @@
# ends with ".so" (or ".sl" for HP-UX), so rename the library
# to its proper name (with version) after linking.
_LT_AC_TAGVAR(archive_cmds, $1)='templib=`echo $lib | $SED -e
"s/\.${shared_ext}\..*/\.${shared_ext}/"`; $CC $predep_objects $libobjs $deplibs
$postdep_objects $compiler_flags --soname $soname -o \$templib; mv \$templib $lib'
- _LT_AC_TAGVAR(archive_expsym_cmds, $1)='templib=`echo $lib | $SED -e
"s/\.${shared_ext}\..*/\.${shared_ext}/"`; $CC $predep_objects $libobjs $deplibs
$postdep_objects $compiler_flags --soname $soname -o \$templib
${wl}-retain-symbols-file,$export_symbols; mv \$templib $lib'
++ _LT_AC_TAGVAR(archive_expsym_cmds, $1)='$echo "{ global:" > $lib.exp~cat
+$export_symbols | sed -e "s/\(.*\)/\1;/" >> $lib.exp~$echo "local: *; };" >> $lib.exp~
+ templib=`echo $lib | $SED -e "s/\.${shared_ext}\..*/\.${shared_ext}/"`; $CC
+$predep_objects $libobjs $deplibs $postdep_objects $compiler_flags --soname $soname
+-o \$templib ${wl}-retain-symbols-file,$export_symbols ${wl}-version-script,$lib.exp;
+mv \$templib $lib'
# Commands to make compiler produce verbose output that lists
# what "hidden" libraries, object files and flags are used when
# linking a shared library.
@@ -2991,7 +2992,8 @@
cxx)
# Compaq C++
_LT_AC_TAGVAR(archive_cmds, $1)='$CC -shared $predep_objects $libobjs $deplibs
$postdep_objects $compiler_flags ${wl}-soname $wl$soname -o $lib'
- _LT_AC_TAGVAR(archive_expsym_cmds, $1)='$CC -shared $predep_objects $libobjs
$deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname -o $lib
${wl}-retain-symbols-file $wl$export_symbols'
+ _LT_AC_TAGVAR(archive_expsym_cmds, $1)='$echo "{ global:" > $lib.exp~cat
+$export_symbols | sed -e "s/\(.*\)/\1;/" >> $lib.exp~$echo "local: *; };" >> $lib.exp~
+ $CC -shared $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags
+${wl}-soname $wl$soname -o $lib ${wl}-retain-symbols-file $wl$export_symbols
+${wl}-version-script ${wl}$lib.exp'
runpath_var=LD_RUN_PATH
_LT_AC_TAGVAR(hardcode_libdir_flag_spec, $1)='-rpath $libdir'
@@ -4960,6 +4962,12 @@
wlarc=
_LT_AC_TAGVAR(hardcode_direct, $1)=yes
_LT_AC_TAGVAR(hardcode_shlibpath_var, $1)=no
+ ;;
+
+ linux*)
+ _LT_AC_TAGVAR(archive_cmds, $1)='$CC -shared $libobjs $deplibs $compiler_flags
+${wl}-soname $wl$soname -o $lib'
+ _LT_AC_TAGVAR(archive_expsym_cmds, $1)='$echo "{ global:" > $lib.exp~cat
+$export_symbols | sed -e "s/\(.*\)/\1;/" >> $lib.exp~$echo "local: *; };" >> $lib.exp~
+ $CC -shared $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname
+${wl}-retain-symbols-file $wl$export_symbols ${wl}-version-script ${wl}$lib.exp -o
+$lib'
;;
*)
--
`I knew that there had to be aliens somewhere in the universe. What I
did not know until now was that they read USENET.' --- Mark Hughes,
on those who unaccountably fail to like _A Fire Upon The Deep_
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