powerpc: Don't do gcc version checks if we're building with clang

We have several checks for bad gcc versions in our Makefile. These don't
apply if we're building with clang, so skip them in that case.

The obvious check would be for ${COMPILER} = "gcc", but because of the
way the logic in the top level Makefile conditionally sets COMPILER,
it's possible that we're building with gcc but COMPILER was not set.

So instead check for ${COMPILER} != "clang", which we know is currently
the only other possibility.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 07a480861f785295f51a28879c9ecfa9dad6955f..3609504b0ad20082be3622f8ea423bf13912e47c 100644 (file)
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -314,7 +314,8 @@ TOUT        := .tmp_gas_check
 # - Require gcc 4.0 or above on 64-bit
 # - gcc-4.2.0 has issues compiling modules on 64-bit
 checkbin:
-       @if test "$(cc-version)" = "0304" ; then \
+       @if test "${COMPILER}" != "clang" \
+           && test "$(cc-version)" = "0304" ; then \
                if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
                        echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
                        echo 'correctly with gcc-3.4 and your version of binutils.'; \
@@ -322,13 +323,15 @@ checkbin:
                        false; \
                fi ; \
        fi
-       @if test "$(cc-version)" -lt "0400" \
+       @if test "${COMPILER}" != "clang" \
+           && test "$(cc-version)" -lt "0400" \
            && test "x${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 "$(cc-fullversion)" = "040200" \
+       @if test "${COMPILER}" != "clang" \
+           && test "$(cc-fullversion)" = "040200" \
            && test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \
                echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
                echo 'kernel with modules enabled.' ; \