powerpc: Fix stackprotector detection for non-glibc toolchains

If GCC is not built with glibc support then we must explicitly tell it
which register to use for TLS mode stack protector, otherwise it will
error out and the cc-option check will fail.

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

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 1888636..3d00811 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -180,7 +180,8 @@ config PPC
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_TRACEHOOK
        select HAVE_CBPF_JIT                    if !PPC64
-       select HAVE_STACKPROTECTOR              if $(cc-option,-mstack-protector-guard=tls)
+       select HAVE_STACKPROTECTOR              if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
+       select HAVE_STACKPROTECTOR              if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
        select HAVE_CONTEXT_TRACKING            if PPC64
        select HAVE_DEBUG_KMEMLEAK
        select HAVE_DEBUG_STACKOVERFLOW