From cdc17f60dc8c26d15bf1b24479d5afa92e23205a Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Thu, 7 Nov 2013 03:33:20 +0100
Subject: [PATCH] 	* configure.ac: Add -freg-struct-return on all
 platforms that 	support it.

---
 ChangeLog            |  5 +++++
 conf/Makefile.common |  8 ++++----
 configure.ac         | 11 +++++++++++
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index dc18000f7..c090177ac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-11-07  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* configure.ac: Add -freg-struct-return on all platforms that
+	support it.
+
 2013-11-07  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* acinclude.m4: Use -Werror on parameter tests.
diff --git a/conf/Makefile.common b/conf/Makefile.common
index 9eaff2e49..33dbb0364 100644
--- a/conf/Makefile.common
+++ b/conf/Makefile.common
@@ -7,16 +7,16 @@ unexport LC_ALL
 
 # Platform specific options
 if COND_i386_pc
-  CFLAGS_PLATFORM += -mrtd -mregparm=3 -freg-struct-return
+  CFLAGS_PLATFORM += -mrtd -mregparm=3
 endif
 if COND_i386_qemu
-  CFLAGS_PLATFORM += -mrtd -mregparm=3 -freg-struct-return
+  CFLAGS_PLATFORM += -mrtd -mregparm=3
 endif
 if COND_i386_coreboot
-  CFLAGS_PLATFORM += -mrtd -mregparm=3 -freg-struct-return
+  CFLAGS_PLATFORM += -mrtd -mregparm=3
 endif
 if COND_i386_ieee1275
-  CFLAGS_PLATFORM += -mrtd -mregparm=3 -freg-struct-return
+  CFLAGS_PLATFORM += -mrtd -mregparm=3
 endif
 if COND_mips_loongson
   CFLAGS_PLATFORM += -mexplicit-relocs
diff --git a/configure.ac b/configure.ac
index 338e267e3..96f90e48b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -499,6 +499,17 @@ if test "x$target_cpu" = xi386; then
   fi
 fi
 
+AC_CACHE_CHECK([whether -freg-struct-return works], [grub_cv_cc_freg_struct_return], [
+    CFLAGS="$TARGET_CFLAGS -freg-struct-return -Werror"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
+        [grub_cv_cc_freg_struct_return=yes],
+	[grub_cv_cc_freg_struct_return=no])
+])
+
+if test "x$grub_cv_cc_freg_struct_return" = xyes; then
+    TARGET_CFLAGS="$TARGET_CFLAGS -freg-struct-return"
+fi
+
 if ( test "x$target_cpu" = xi386 || test "x$target_cpu" = xx86_64 ) && test "x$platform" != xemu; then
   # Some toolchains enable these features by default, but they need
   # registers that aren't set up properly in GRUB.