MIPS: vdso: Allow clang's --target flag in VDSO cflags

The MIPS VDSO code filters out a subset of known-good flags from
KBUILD_CFLAGS to use when building VDSO libraries. When we build using
clang we need to allow the --target flag through, otherwise we'll
generally attempt to build the VDSO for the architecture of the build
machine rather than for MIPS.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20154/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org

diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 477c463c89ec2a9aa409fb63231d245973e8629c..bd79b27faa2b9194ad75e982f1e35809baf0530e 100644 (file)
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -9,6 +9,11 @@ ccflags-vdso := \
        $(filter -mmicromips,$(KBUILD_CFLAGS)) \
        $(filter -march=%,$(KBUILD_CFLAGS)) \
        -D__VDSO__
+
+ifeq ($(cc-name),clang)
+ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
+endif
+
 cflags-vdso := $(ccflags-vdso) \
        $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
        -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \