[PATCH] rust: arch:um: Fix building 32-bit UML with GCC

[David Gow <david@davidgow.net>]

32-bit UML builds can be configured either by setting CONFIG_64BIT=n or
with SUBARCH=i386. Both work with Rust-for-Linux when clang is the
compiler, but when SUBARCH=i386, we don't set a bindgen target correctly if
gcc is the compiler.

Add the appropriate bindgen target configuration for i386, as is done in
Makefile.clang.

Fixes: ab0f4cedc355 ("arch: um: rust: Add i386 support for Rust")
Signed-off-by: David Gow <david@davidgow.net>
---

This could go in via either the rust or um trees. I suspect rust is less
likely to trigger conflicts, though.

Cheers,
-- David

---
 rust/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/Makefile b/rust/Makefile
index b361bfedfdf0..b9e9f512cec3 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -403,6 +403,8 @@ BINDGEN_TARGET_x86	:= x86_64-linux-gnu
 BINDGEN_TARGET_arm64	:= aarch64-linux-gnu
 BINDGEN_TARGET_arm	:= arm-linux-gnueabi
 BINDGEN_TARGET_loongarch	:= loongarch64-linux-gnusf
+# This is only for i386 UM builds, which need the 32-bit target not -m32
+BINDGEN_TARGET_i386	:= i386-linux-gnu
 BINDGEN_TARGET_um	:= $(BINDGEN_TARGET_$(SUBARCH))
 BINDGEN_TARGET		:= $(BINDGEN_TARGET_$(SRCARCH))
 
-- 
2.53.0