Bug 1500154 - Link with -Bsymbolic-functions whenever possible. r=glandium

This speeds up calls within libxul by avoiding PLT jumps.

Differential Revision: https://phabricator.services.mozilla.com/D9686

--HG--
extra : moz-landing-system : lando

js/src/old-configure.in

@@ -485,6 +485,13 @@ if test "$GNU_CC"; then
                   AC_MSG_RESULT([no])
                   LDFLAGS=$_SAVE_LDFLAGS)
 
+    AC_MSG_CHECKING([for -Bsymbolic-functions option to ld])
+    _SAVE_LDFLAGS=$LDFLAGS
+    LDFLAGS="$LDFLAGS -Wl,-Bsymbolic-functions"
+    AC_TRY_LINK(,,AC_MSG_RESULT([yes]),
+                  AC_MSG_RESULT([no])
+                  LDFLAGS=$_SAVE_LDFLAGS)
+
     AC_MSG_CHECKING([for --build-id=sha1 option to ld])
     _SAVE_LDFLAGS=$LDFLAGS
     LDFLAGS="$LDFLAGS -Wl,--build-id=sha1"

old-configure.in

@@ -518,6 +518,13 @@ if test "$GNU_CC"; then
                   AC_MSG_RESULT([no])
                   LDFLAGS=$_SAVE_LDFLAGS)
 
+    AC_MSG_CHECKING([for -Bsymbolic-functions option to ld])
+    _SAVE_LDFLAGS=$LDFLAGS
+    LDFLAGS="$LDFLAGS -Wl,-Bsymbolic-functions"
+    AC_TRY_LINK(,,AC_MSG_RESULT([yes]),
+                  AC_MSG_RESULT([no])
+                  LDFLAGS=$_SAVE_LDFLAGS)
+
     AC_MSG_CHECKING([for --build-id=sha1 option to ld])
     _SAVE_LDFLAGS=$LDFLAGS
     LDFLAGS="$LDFLAGS -Wl,--build-id=sha1"