[PATCH 12/10] powerpc: unbreak DYNAMIC_DEBUG=y build with clang

[Rasmus Villemoes <linux@rasmusvillemoes.dk>]

Current versions of clang does not like the %c modifier in inline
assembly for targets other than x86, so any DYNAMIC_DEBUG=y build
fails on ppc64. A fix is likely to land in 9.0 (see
https://github.com/ClangBuiltLinux/linux/issues/456), but unbreak the
build for older versions.

Fixes: powerpc: select DYNAMIC_DEBUG_RELATIVE_POINTERS for PPC64
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
Andrew, please apply and/or fold into 10/10.

 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 6821c8ae1d62..8511137ab963 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -155,7 +155,7 @@ config PPC
 	select BUILDTIME_EXTABLE_SORT
 	select CLONE_BACKWARDS
 	select DCACHE_WORD_ACCESS		if PPC64 && CPU_LITTLE_ENDIAN
-	select DYNAMIC_DEBUG_RELATIVE_POINTERS	if PPC64
+	select DYNAMIC_DEBUG_RELATIVE_POINTERS	if PPC64 && (CC_IS_GCC || CLANG_VERSION >= 90000)
 	select DYNAMIC_FTRACE			if FUNCTION_TRACER
 	select EDAC_ATOMIC_SCRUB
 	select EDAC_SUPPORT
-- 
2.20.1