[PATCH] csky: Fix build with upstream gcc

[Joerg Roedel <joro@8bytes.org>]

From: Joerg Roedel <jroedel@suse.de>

Building a kernel for the CSKY architecture with CONFIG_FRAME_POINTER
set requires a gcc supporting the non-upstream '-mbacktrace' option.
Check for the '-mbacktrace' option before enabling CONFIG_FRAMEPOINTER
and fix building CSKY with an upstream gcc compiler.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/csky/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index bd31ab12f77d..1622e1c56026 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -8,7 +8,7 @@ config CSKY
 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_QUEUED_RWLOCKS if NR_CPUS>2
-	select ARCH_WANT_FRAME_POINTERS if !CPU_CK610
+	select ARCH_WANT_FRAME_POINTERS if (!CPU_CK610 && STACKTRACE_SUPPORT)
 	select COMMON_CLK
 	select CLKSRC_MMIO
 	select CSKY_MPINTC if CPU_CK860
@@ -125,7 +125,7 @@ config MMU
 	def_bool y
 
 config STACKTRACE_SUPPORT
-	def_bool y
+	def_bool $(success,echo 'int foo(void) { return 0; }' | $(CC) -mbacktrace -x c - -c -o /dev/null)
 
 config TIME_LOW_RES
 	def_bool y
-- 
2.27.0