[PATCH] configure.ac: support -fdiagnostics-color=always

[Michael Zimmermann]

---
 configure.ac | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure.ac b/configure.ac
index 891c14f..1f8cb2c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1046,6 +1046,15 @@ if test "x$grub_cv_target_cc_qn" = xyes; then
   TARGET_CFLAGS="$TARGET_CFLAGS -Qn"
 fi

+AC_CACHE_CHECK([whether option -fdiagnostics-color=always works],
grub_cv_target_cc_fdiagnostics_color, [
+  CFLAGS="$TARGET_CFLAGS -fdiagnostics-color=always -Werror"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
+                   [grub_cv_target_cc_fdiagnostics_color=yes],
+                   [grub_cv_target_cc_fdiagnostics_color=no])])
+if test "x$grub_cv_target_cc_fdiagnostics_color" = xyes; then
+  TARGET_CFLAGS="$TARGET_CFLAGS -fdiagnostics-color=always"
+fi
+
 #
 # Compiler features.
 #
-- 
1.9.1