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Commit 82a85084 authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
Browse files

powerpc: Require gcc 4.0 on 64-bit 



Older versions of gcc had issues with using -maltivec together with
-mcpu of a non altivec capable CPU. We work around it by specifying
-mcpu=970, but the logic is complicated.

In preparation for adding more -mcpu targets, remove the workaround
and just require gcc 4.0 for 64-bit builds.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 694caf02

arch/powerpc/Makefile

+10 −3
Original line number Diff line number Diff line
@@ -234,10 +234,11 @@ archprepare: checkbin 
# 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.

# gcc-3.4 and binutils-2.14 are a fatal combination.



# Check gcc and binutils versions:

# - gcc-3.4 and binutils-2.14 are a fatal combination

# - Require gcc 4.0 or above on 64-bit

# - gcc-4.2.0 has issues compiling modules on 64-bit

checkbin:

	@if test "$(call cc-version)" = "0304" ; then \

		if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
@@ -247,6 +248,12 @@ checkbin: 
			false; \

		fi ; \

	fi

	@if test "$(call cc-version)" -lt "0400" \

	    && test "x${CONFIG_PPC64}" = "xy" ; then \

                echo -n "Sorry, GCC v4.0 or above is required to build " ; \

                echo "the 64-bit powerpc kernel." ; \

                false ; \

        fi

	@if test "$(call cc-fullversion)" = "040200" \

	    && test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \

		echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \