[PATCH] rust: Fix enabling Rust and building with GCC for LoongArch

[WANG Rui]

This patch fixes a build issue on LoongArch when Rust is enabled and
compiled with GCC by explicitly setting the bindgen target and skipping
C flags that Clang doesn't support.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: WANG Rui <wangrui@xxxxxxxxxxx>
---
 rust/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rust/Makefile b/rust/Makefile
index ea3849eb78f6..2c57c624fe7d 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -232,7 +232,8 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
 	-mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
 	-mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
 	-mno-pointers-to-nested-functions -mno-string \
-	-mno-strict-align -mstrict-align \
+	-mno-strict-align -mstrict-align -mdirect-extern-access \
+	-mexplicit-relocs -mno-check-zero-division \
 	-fconserve-stack -falign-jumps=% -falign-loops=% \
 	-femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
 	-fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
@@ -246,6 +247,7 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
 # Derived from `scripts/Makefile.clang`.
 BINDGEN_TARGET_x86	:= x86_64-linux-gnu
 BINDGEN_TARGET_arm64	:= aarch64-linux-gnu
+BINDGEN_TARGET_loongarch	:= loongarch64-linux-gnusf
 BINDGEN_TARGET		:= $(BINDGEN_TARGET_$(SRCARCH))
 
 # All warnings are inhibited since GCC builds are very experimental,
-- 
2.48.1