[PATCH][PPC32] Fix the 'checkbin' target

[Tom Rini <trini@kernel.crashing.org>]

Hello.

Currently, the checkbin target on PPC32 isn't quite right.  First, one
of the tests (to ensure that some instructions are known to gas) is
never actually invoked because 'checkbin' doesn't know about stuff set
in .config, so we always have the 'else' case run.  This changes to
always running the test and telling the user to upgrade to at least
binutils 2.12.1.  The next problem is that we were doing $(AS) -o
/dev/null ... in both that test, as well as another.  The problem here
is that the checkbin target is run on the install targets, meaning that
/dev/null will get unlinked when the test passes.  To get around this we
use .tmp_gas_check as the output file instead.

Assuming Sam doesn't object, I hope this can go in quickly.  Thanks.

Signed-off-by: Tom Rini <trini@kernel.crashing.org>

--- linux-2.6.orig/arch/ppc/Makefile
+++ linux-2.6/arch/ppc/Makefile
@@ -104,16 +104,15 @@ arch/$(ARCH)/kernel/asm-offsets.s: inclu
 include/asm-$(ARCH)/offsets.h: arch/$(ARCH)/kernel/asm-offsets.s
 	$(call filechk,gen-asm-offsets)
 
-ifdef CONFIG_6xx
-# Ensure this is binutils 2.12.1 (or 2.12.90.0.7) or later
-NEW_AS	:= $(shell echo dssall | $(AS) -many -o /dev/null >/dev/null 2>&1 ; echo $$?)
-GOODVER	:= 2.12.1
-else
-NEW_AS	:= 0
-endif
+# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
+# to stdout and these checks are run even on install targets.
+TOUT	:= .tmp_gas_check
+# Ensure this is binutils 2.12.1 (or 2.12.90.0.7) or later for altivec
+# instructions.
+AS_ALTIVEC	:= $(shell echo dssall | $(AS) -many -o $(TOUT) >/dev/null 2>&1 ; echo $$?)
 # gcc-3.4 and binutils-2.14 are a fatal combination.
 GCC_VERSION	:= $(call cc-version)
-BAD_GCC_AS	:= $(shell echo mftb 5 | $(AS) -mppc -many -o /dev/null >/dev/null 2>&1 && echo 0 || echo 1)
+BAD_GCC_AS	:= $(shell echo mftb 5 | $(AS) -mppc -many -o $(TOUT) >/dev/null 2>&1 && echo 0 || echo 1)
 
 checkbin:
 ifeq ($(GCC_VERSION)$(BAD_GCC_AS),03041)
@@ -122,10 +121,11 @@ ifeq ($(GCC_VERSION)$(BAD_GCC_AS),03041)
 	@echo '*** Please upgrade your binutils or downgrade your gcc'
 	@false
 endif
-ifneq ($(NEW_AS),0)
+ifneq ($(AS_ALTIVEC),0)
+	echo $(AS_ALTIVEC)
 	@echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '
 	@echo 'correctly with old versions of binutils.'
-	@echo '*** Please upgrade your binutils to ${GOODVER} or newer'
+	@echo '*** Please upgrade your binutils to 2.12.1 or newer'
 	@false
 endif
 	@true

-- 
Tom Rini
http://gate.crashing.org/~trini/