From 57bc5d431b3ccf76b4ba81c3bb9bfeba3ce75e1d Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Tue, 24 Dec 2013 15:00:46 +0100
Subject: [PATCH] 	Add -Qn to TARGET_CFLAGS if it's supported. 	Fixes
 compilation on cygwin.

	Reported by: Andrey Borzenkov.
	Suggested by: Andrey Borzenkov.
---
 ChangeLog    | 8 ++++++++
 configure.ac | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 65e8a1e03..e12dbaefb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2013-12-24  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	Add -Qn to TARGET_CFLAGS if it's supported.
+	Fixes compilation on cygwin.
+
+	Reported by: Andrey Borzenkov.
+	Suggested by: Andrey Borzenkov.
+
 2013-12-24  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	Save TARGET_CC version in modinfo.sh.
diff --git a/configure.ac b/configure.ac
index 2aa2fb3b1..2836fc2cb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -913,6 +913,15 @@ if test "x$target_cpu" = xarm; then
   fi
 fi
 
+AC_CACHE_CHECK([whether option -Qn works], grub_cv_target_cc_qn, [
+  CFLAGS="$TARGET_CFLAGS -Qn -Werror"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
+		    [grub_cv_target_cc_qn=yes],
+		    [grub_cv_target_cc_qn=no])])
+if test "x$grub_cv_target_cc_qn" = xyes; then
+  TARGET_CFLAGS="$TARGET_CFLAGS -Qn"
+fi
+
 #
 # Compiler features.
 #