From d2bf06bf34d094ebbb188930ab468f0a8fcc6913 Mon Sep 17 00:00:00 2001
From: Robert Millan <rmh@gnu.org>
Date: Sun, 7 Nov 2010 16:29:10 +0100
Subject: [PATCH] 2010-11-07  Robert Millan  <rmh@gnu.org>

	On mips-yeeloong, build with -march=loongson2f when this flag is
	available (GCC >= 4.4).
	* conf/Makefile.common [COND_mips_yeeloong] (CFLAGS_PLATFORM): Remove
	`-march=mips3'.
	* configure.ac: For mips-yeeloong, add -march=loongson2f if available,
	or otherwise add -march=mips3.
---
 ChangeLog            |  9 +++++++++
 conf/Makefile.common |  2 +-
 configure.ac         | 17 +++++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index a35961641..79138e8c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2010-11-07  Robert Millan  <rmh@gnu.org>
+
+	On mips-yeeloong, build with -march=loongson2f when this flag is
+	available (GCC >= 4.4).
+	* conf/Makefile.common [COND_mips_yeeloong] (CFLAGS_PLATFORM): Remove
+	`-march=mips3'.
+	* configure.ac: For mips-yeeloong, add -march=loongson2f if available,
+	or otherwise add -march=mips3.
+
 2010-11-07  BVK Chaitanya  <bvk.groups@gmail.com>
 
 	Suppress shell expansion on echo '*' and echo "*" like cases.
diff --git a/conf/Makefile.common b/conf/Makefile.common
index 32851e34e..a3ccebcc5 100644
--- a/conf/Makefile.common
+++ b/conf/Makefile.common
@@ -22,7 +22,7 @@ if COND_i386_ieee1275
   CFLAGS_PLATFORM += -mrtd -mregparm=3
 endif
 if COND_mips_yeeloong
-  CFLAGS_PLATFORM += -march=mips3 -mexplicit-relocs
+  CFLAGS_PLATFORM += -mexplicit-relocs
   CPPFLAGS_PLATFORM = -DUSE_ASCII_FAILBACK
   CCASFLAGS_PLATFORM = -march=mips3
 endif
diff --git a/configure.ac b/configure.ac
index 66d4a6877..1ad3a8e98 100644
--- a/configure.ac
+++ b/configure.ac
@@ -401,6 +401,23 @@ if test "x$grub_cv_cc_fno_dwarf2_cfi_asm" = xyes; then
   TARGET_CFLAGS="$TARGET_CFLAGS -fno-dwarf2-cfi-asm"
 fi
 
+if test "${target_cpu}-${platform}" = mips-yeeloong; then
+  AC_CACHE_CHECK([whether -march=loongson2f works], [grub_cv_cc_march_loongson2f], [
+    SAVE_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -march=loongson2f"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
+        [grub_cv_cc_march_loongson2f=yes],
+        [grub_cv_cc_march_loongson2f=no])
+    CFLAGS="$SAVE_CFLAGS"
+  ])
+
+  if test "x$grub_cv_cc_march_loongson2f" = xyes; then
+    TARGET_CFLAGS="$TARGET_CFLAGS -march=loongson2f"
+  else
+    TARGET_CFLAGS="$TARGET_CFLAGS -march=mips3"
+  fi
+fi
+
 grub_apple_target_cc
 if test x$grub_cv_apple_target_cc = xyes ; then
   TARGET_CPPFLAGS="$TARGET_CPPFLAGS -DAPPLE_CC=1"