Back in 2003, libtool got a patch to use -version-script instead of
-retain-symbols-file under Linux (in the repo it's commit
fb5e6cda96bd9dcae9e4f62ec8b6b3e572a32743).
While I was toying with a few things, I've noticed, that this patch
doesn't affect C++.
I don't know if there was a technical reason for this.
I've came up with a patch, that kind of works, though it's most likely
not really correct. It's against libtool 2.4.
If this mail reaches the list, I'd like to know:
- was skipping C++ back then done on purpose ?
- just how incorrect is the attched patch ?
PS: CC me with the replies.
--- libtool.m4.old 2011-09-06 09:54:13.000000000 +0200
+++ libtool.m4 2013-02-03 07:45:11.446790391 +0100
@@ -4503,6 +4503,40 @@
_LT_TAGVAR(export_symbols_cmds, $1)='$NM $libobjs $convenience | $global_symbol_pipe | $SED '\''s/.* //'\'' | sort | uniq > $export_symbols'
;;
esac
+ if test "$with_gnu_ld" = yes; then
+ supports_anon_versioning=no
+ case `$LD -v 2>&1` in
+ *GNU\ gold*) supports_anon_versioning=yes ;;
+ *\ [[01]].* | *\ 2.[[0-9]].* | *\ 2.10.*) ;; # catch versions < 2.11
+ *\ 2.11.93.0.2\ *) supports_anon_versioning=yes ;; # RH7.3 ...
+ *\ 2.11.92.0.12\ *) supports_anon_versioning=yes ;; # Mandrake 8.2 ...
+ *\ 2.11.*) ;; # other 2.11 versions
+ *) supports_anon_versioning=yes ;;
+ esac
+ fi
+ case $host_os in
+ gnu* | linux* | tpf* | k*bsd*-gnu | kopensolaris*-gnu)
+ tmp_diet=no
+ if test "$host_os" = linux-dietlibc; then
+ case $cc_basename in
+ diet\ *) tmp_diet=yes;; # linux-dietlibc with static linking (!diet-dyn)
+ esac
+ fi
+ if $LD --help 2>&1 | $EGREP ': supported targets:.* elf' > /dev/null \
+ && test "$tmp_diet" = no
+ then
+ tmp_addflag=' $pic_flag'
+ tmp_sharedflag='-shared'
+ if test "x$supports_anon_versioning" = xyes; then
+ _LT_TAGVAR(archive_expsym_cmds, $1)='echo "{ global: extern \"C++\" {" > $output_objdir/$libname.ver~
+ cat $export_symbols | sed -e "s/\(.*\)/\1;/" >> $output_objdir/$libname.ver~
+ echo "}; local: *; };" >> $output_objdir/$libname.ver~
+ $CC '"$tmp_sharedflag""$tmp_addflag"' $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname ${wl}-version-script ${wl}$output_objdir/$libname.ver -o $lib'
+ fi
+ fi
+ ;;
+ esac
+
], [
runpath_var=
_LT_TAGVAR(allow_undefined_flag, $1)=
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