PPC: fix "Warning: FOO uses hard float, BAR uses soft float".

It appears that with recent versions of GCC the explicit
"-mhard-float" command line option takes precedence over the
``asm(".gnu_attribute 4, 2");'' in the source file, so this no longer
helps to avoid the warnings we get when linking code that uses FP
instructions with other code that was built using soft-float.

We can remove the ".gnu_attribute" (which appears to carry no other
information, at least so far) from the object files, but we also have
to make sure we don't pull in the __gcc_qsub() and __gcc_qmul()
functions from the standard libgcc, as these would again "infect" our
linking.  We copy this code from:
	gcc-4.2.2/gcc/config/rs6000/darwin-ldouble.c
This old version was chosen because it was still available under a
compatible license (GCC v2+).   The file was stripped down to the
needed parts, and reformatted so it passes checkpatch with only one
warning (do not add new typedefs).

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Stefan Roese <sr@denx.de>
Cc: Andy Fleming <afleming@gmail.com>
Cc: Kim Phillips <kim.phillips@freescale.com>
Tested-by: Stefan Roese <sr@denx.de>
Tested-by: Anatolij Gustschin <agust@denx.de>
diff --git a/post/lib_powerpc/fpu/Makefile b/post/lib_powerpc/fpu/Makefile
index b97ad6f..5d0e52d 100644
--- a/post/lib_powerpc/fpu/Makefile
+++ b/post/lib_powerpc/fpu/Makefile
@@ -24,10 +24,23 @@
 
 LIB	= libpost$(ARCH)fpu.o
 
-COBJS-$(CONFIG_HAS_POST)	+= fpu.o 20001122-1.o 20010114-2.o 20010226-1.o 980619-1.o
-COBJS-$(CONFIG_HAS_POST)	+= acc1.o compare-fp-1.o mul-subnormal-single-1.o
+COBJS-$(CONFIG_HAS_POST)	+= 20001122-1.o
+COBJS-$(CONFIG_HAS_POST)	+= 20010114-2.o
+COBJS-$(CONFIG_HAS_POST)	+= 20010226-1.o
+COBJS-$(CONFIG_HAS_POST)	+= 980619-1.o
+COBJS-$(CONFIG_HAS_POST)	+= acc1.o
+COBJS-$(CONFIG_HAS_POST)	+= compare-fp-1.o
+COBJS-$(CONFIG_HAS_POST)	+= fpu.o
+COBJS-$(CONFIG_HAS_POST)	+= mul-subnormal-single-1.o
+
+COBJS-$(CONFIG_HAS_POST)	+= darwin-ldouble.o
 
 include $(TOPDIR)/post/rules.mk
 
 CFLAGS := $(shell echo $(CFLAGS) | sed s/-msoft-float//)
 CFLAGS += -mhard-float -fkeep-inline-functions
+
+$(obj)%.o:	%.c
+	$(CC)  $(ALL_CFLAGS) -o $@.fp $< -c
+	$(OBJCOPY) -R .gnu.attributes $@.fp $@
+	rm -f $@.fp