Allowlist more clang flags in bindgen (#2902)
Especially `--target` is very usable for cross-compilation use cases.
diff --git a/bindgen/private/bindgen.bzl b/bindgen/private/bindgen.bzl
index 2155cca..dc4e77c 100644
--- a/bindgen/private/bindgen.bzl
+++ b/bindgen/private/bindgen.bzl
@@ -267,7 +267,21 @@
# Ideally we could depend on a more specific toolchain, requesting one which is specifically clang via some constraint.
# Unfortunately, we can't currently rely on this, so instead we filter only to flags we know clang supports.
# We can add extra flags here as needed.
- flags_known_to_clang = ("-I", "-iquote", "-isystem", "--sysroot", "--gcc-toolchain")
+ flags_known_to_clang = (
+ "-I",
+ "-iquote",
+ "-isystem",
+ "--sysroot",
+ "--gcc-toolchain",
+ "--target",
+ "-W",
+ "--system-header-prefix",
+ "--no-system-header-prefix",
+ "-Xclang",
+ "-D",
+ "-no-canonical-prefixes",
+ "-nostd",
+ )
open_arg = False
for arg in compile_flags:
if open_arg:
