configure: Use -Bsymbolic-functions if available

While this is more useful for libraries, some of our plugins with multiple
files and some internal API can also benefit from this.

diff --git a/configure.ac b/configure.ac
index 4b7e012..b3863bb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -171,6 +171,21 @@ AC_SUBST(GSTPB_PREFIX)
 dnl Needed by plugins that use g_module_*() API
 PKG_CHECK_MODULES(GMODULE_NO_EXPORT, gmodule-no-export-2.0)
 
+dnl Check for -Bsymbolic-functions linker flag used to avoid
+dnl intra-library PLT jumps, if available.
+AC_ARG_ENABLE(Bsymbolic,
+              [AS_HELP_STRING([--disable-Bsymbolic],[avoid linking with -Bsymbolic])],,
+              [SAVED_LDFLAGS="${LDFLAGS}" SAVED_LIBS="${LIBS}"
+               AC_MSG_CHECKING([for -Bsymbolic-functions linker flag])
+               LDFLAGS=-Wl,-Bsymbolic-functions
+               LIBS=
+               AC_TRY_LINK([], [return 0],
+                           AC_MSG_RESULT(yes)
+                           enable_Bsymbolic=yes,
+                           AC_MSG_RESULT(no)
+                           enable_Bsymbolic=no)
+               LDFLAGS="${SAVED_LDFLAGS}" LIBS="${SAVED_LIBS}"])
+
 dnl *** set variables based on configure arguments ***
 
 dnl set license and copyright notice
@@ -432,6 +447,9 @@ AC_SUBST(GST_LIBS)
 dnl LDFLAGS really should only contain flags, not libs - they get added before
 dnl whatevertarget_LIBS and -L flags here affect the rest of the linking
 GST_ALL_LDFLAGS="-no-undefined"
+if test "x${enable_Bsymbolic}" = "xyes"; then
+  GST_ALL_LDFLAGS="$GST_ALL_LDFLAGS -Wl,-Bsymbolic-functions"
+fi
 AC_SUBST(GST_ALL_LDFLAGS)
 
 dnl this really should only contain flags, not libs - they get added before