[Bug 144598] Versioned symbols

[libcroco (bugzilla.gnome.org)]

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http://bugzilla.gnome.org/show_bug.cgi?id=144598
 libcroco | General | Ver: 0.6





------- Comment #3 from Josselin Mouette  2006-05-01 18:34 UTC -------
This is because not all dynamic linkers support -version-script.

This patch is far from being optimal anyway, because the ability to use
-version-script should be detected at configure time.

Something like this would be more suitable (stolen from libgnutls):

AC_MSG_CHECKING([if libraries can be versioned])
GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
if test "$GLD"; then
    have_ld_version_script=yes
    AC_MSG_RESULT(yes)
else
    have_ld_version_script=no
    AC_MSG_RESULT(no)
    AC_MSG_WARN(***
*** You may want to rerun configure using --with-gnu-ld to enable versioned
symbols.
)
fi
AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

and in Makefile.am:

if HAVE_LD_VERSION_SCRIPT
libcroco_0_6_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libgnutls.vers
endif

If you're planning to restrict the list of exported symbols like you did for
librsvg, it has to be done in the same version script, as it is unfortunately
impossible to mix -Wl,--version-script with -export-symbols (the latter uses
the former internally).


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