1 files changed, 14 insertions, 0 deletions
diff --git a/win/tcl.m4 b/win/tcl.m4
index 4960c12..40ce538 100644
--- a/win/tcl.m4
+++ b/win/tcl.m4
@@ -499,6 +499,7 @@ AC_DEFUN([SC_ENABLE_SYMBOLS], [
 #		CFLAGS_DEBUG
 #		CFLAGS_OPTIMIZE
 #		CFLAGS_WARNING
+#		CFLAGS_NOLTO
 #		LDFLAGS_DEBUG
 #		LDFLAGS_OPTIMIZE
 #		LDFLAGS_CONSOLE
@@ -658,6 +659,18 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	else
 	    extra_cflags="$extra_cflags -DTCL_BROKEN_MAINARGS"
 	fi
+	AC_CACHE_CHECK(for working -fno-lto,
+	    ac_cv_nolto,
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+	    [ac_cv_nolto=yes],
+	    [ac_cv_nolto=no])
+	)
+	CFLAGS=$hold_cflags
+	if test "$ac_cv_nolto" = "yes" ; then
+	    CFLAGS_NOLTO="-fno-lto"
+	else
+	    CFLAGS_NOLTO=""
+	fi
     fi
 
     AC_MSG_CHECKING([compiler flags])
@@ -1083,6 +1096,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
     AC_SUBST(CFLAGS_DEBUG)
     AC_SUBST(CFLAGS_OPTIMIZE)
     AC_SUBST(CFLAGS_WARNING)
+    AC_SUBST(CFLAGS_NOLTO)
 ])
 
 #------------------------------------------------------------------------