mips: Fix soft-float handling.

Add -msoft-float alongside clang arguments to specify ABI.
Specify ABI in asm files explicitly.
This trigers asm warning due to gcc failing to propagate -msoft-float
but it's tolerable.

configure.ac

@@ -695,7 +695,8 @@ if test x"$platform" != xemu ; then
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
 		         [grub_cv_target_cc_soft_float="-mno-inline-float-divide -mno-inline-sqrt"], [])
     fi
-    for cand in "-Xclang -msoft-float -Xclang -no-implicit-float" \
+    for cand in "-msoft-float -Xclang -msoft-float -Xclang -no-implicit-float" \
+		"-Xclang -msoft-float -Xclang -no-implicit-float" \
 		"-Xclang -msoft-float" "-msoft-float"; do
       if test x"$grub_cv_target_cc_soft_float" != xno ; then
         break
@@ -711,7 +712,7 @@ if test x"$platform" != xemu ; then
   fi
 
   case x"$grub_cv_target_cc_soft_float" in
-    x"-Xclang"*)
+    x*"-Xclang"*)
       # A trick so that clang doesn't see it on link stаge
       TARGET_CPPFLAGS="$TARGET_CPPFLAGS $grub_cv_target_cc_soft_float"
       ;;

grub-core/boot/mips/startup_raw.S

@@ -21,6 +21,7 @@
 #include <grub/offsets.h>
 #include <grub/machine/memory.h>
 #include <grub/machine/kernel.h>
+#include <grub/cpu/kernel.h>
 #include <grub/offsets.h>
 
 #define BASE_ADDR 8
@@ -32,6 +33,7 @@
 	.globl __start, _start, start
 	.set noreorder
 	.set nomacro
+	mips_attributes
 __start:
 _start:
 start:		

grub-core/kern/mips/cache.S

@@ -1,8 +1,10 @@
 
 #include <grub/symbol.h>
+#include <grub/cpu/kernel.h>
 
 	.set noreorder
 	.set nomacro
+	mips_attributes
 
 FUNCTION (grub_arch_sync_caches)
 #include "cache_flush.S"

grub-core/kern/mips/startup.S

@@ -21,6 +21,7 @@
 #include <grub/offsets.h>
 #include <grub/machine/memory.h>
 #include <grub/machine/kernel.h>
+#include <grub/cpu/kernel.h>
 #include <grub/offsets.h>
 
 #define BASE_ADDR 8	
@@ -28,6 +29,7 @@
 	.globl __start, _start, start
 	.set noreorder
 	.set nomacro
+	mips_attributes
 __start:
 _start:
 start:		

grub-core/lib/mips/relocator_asm.S

@@ -17,11 +17,13 @@
  */
 
 #include <grub/symbol.h>
+#include <grub/cpu/kernel.h>
 	
 	.p2align	4	/* force 16-byte alignment */
 
 	.set noreorder
 	.set nomacro
+	mips_attributes
 
 VARIABLE (grub_relocator_forward_start)
 	move $a0, $9

include/grub/mips/kernel.h

@@ -21,4 +21,8 @@
 
 #include <grub/symbol.h>
 
+#ifdef ASM_FILE
+#define mips_attributes .gnu_attribute 4, 3
+#endif
+
 #endif /* ! GRUB_KERNEL_MACHINE_HEADER */