change shebang to be more compatible

[wucke13]

This

serde/precompiled/build.sh

Line 1 in 0676673

#!/bin/bash

should be

#!/usr/bin/env bash

in order to maximize compatibility. On many more nieche systems /bin/bash does not exist (/bin/sh would be fine!), but /usr/bin/env and env would be able to find bash on most if not all systems if bash is present at all.

[oli-obk]

Good catch. I'd merge a PR that changes this

[wucke13]

No problem. Another friction point with the script is that it only works with a rustup cargo, not with native cargo (due to reliance on +nightly). I don't know how to robustly detect if cargo is infact rustup:

+ cargo +nightly build --manifest-path bin/Cargo.toml --bin serde_derive --profile precompiled -Z unstable-options -Z build-std=std,panic_abort -Z build-std-features=panic_immediate_abort --target x86_64-unknown-linux-musl --out-dir serde_derive
error: no such command: `+nightly`

	Cargo does not handle `+toolchain` directives.
	Did you mean to invoke `cargo` through `rustup` instead?

[oli-obk]

I think the rustup issue will be fixed by whatever resolves #2575