Backported from mainline

[pf3gnuchains/gcc-fork.git] / libssp / configure.ac

diff --git a/libssp/configure.ac b/libssp/configure.ac
index ee48f4d..93dfa8d 100644 (file)
--- a/libssp/configure.ac
+++ b/libssp/configure.ac
@@ -72,35 +72,42 @@ if test x$ssp_hidden = xyes; then
 fi
 
 AC_MSG_CHECKING([whether symbol versioning is supported])
-if test x$gcc_no_link = xyes; then
-  # If we cannot link, we cannot build shared libraries, so do not use
-  # symbol versioning.
-  ssp_use_symver=no
-else
-  save_LDFLAGS="$LDFLAGS"
-  LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
-  cat > conftest.map <<EOF
+AC_ARG_ENABLE(symvers,
+AS_HELP_STRING([--disable-symvers],
+  [disable symbol versioning for libssp]),
+ssp_use_symver=$enableval,
+ssp_use_symver=yes)
+if test "x$ssp_use_symver" != xno; then
+  if test x$gcc_no_link = xyes; then
+    # If we cannot link, we cannot build shared libraries, so do not use
+    # symbol versioning.
+    ssp_use_symver=no
+  else
+    save_LDFLAGS="$LDFLAGS"
+    LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"
+    cat > conftest.map <<EOF
 FOO_1.0 {
   global: *foo*; bar; local: *;
 };
 EOF
-  AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
-  if test x$ssp_use_symver = xno; then
-    case "$target_os" in
-      solaris2*)
-        LDFLAGS="$save_LDFLAGS"
-        LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
-        # Sun ld cannot handle wildcards and treats all entries as undefined.
-        cat > conftest.map <<EOF
+    AC_TRY_LINK([int foo;],[],[ssp_use_symver=gnu],[ssp_use_symver=no])
+    if test x$ssp_use_symver = xno; then
+      case "$target_os" in
+        solaris2*)
+          LDFLAGS="$save_LDFLAGS"
+          LDFLAGS="$LDFLAGS -fPIC -shared -Wl,-M,./conftest.map"
+          # Sun ld cannot handle wildcards and treats all entries as undefined.
+          cat > conftest.map <<EOF
 FOO_1.0 {
   global: foo; local: *;
 };
 EOF
-        AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
-       ;;
-    esac
+          AC_TRY_LINK([int foo;],[],[ssp_use_symver=sun],[ssp_use_symver=no])
+         ;;
+      esac
+    fi
+    LDFLAGS="$save_LDFLAGS"
   fi
-  LDFLAGS="$save_LDFLAGS"
 fi
 AC_MSG_RESULT($ssp_use_symver)
 AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" != xno])