The C compiler cannot be changed

What version of rules_go are you using?

v0.35.0

What version of gazelle are you using?

N/A

What version of Bazel are you using?

5.3.1

Does this issue reproduce with the latest releases of all the above?

Yes

What operating system and processor architecture are you using?

MacOS 11.6.8 x86_64

Any other potentially useful information about your toolchain?

No

What did you do?

go_binary(
    name = "lib-ios",
    srcs = [
        "main.go",
    ],
    cgo = True,
    linkmode = "c-archive",
    tags = [
        "ios",
    ],
)

What did you expect to see?

I expected there to be an option to change the C compiler. Specifically, I would like to use the C compiler returned from xcrun --sdk iphoneos --find clang

What did you see instead?

There is no option to change the C-compiler

Start with the go_binary example using cgo=True and linkmode="c-archive", then trace how rules_go selects the C compiler under Bazel. Compare that behavior with xcrun --sdk iphoneos --find clang and check the relevant Bazel toolchain configuration. Done means the example can select the requested compiler and still produces the expected iOS archive.