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annotate libpam-sys/build.rs @ 190:995aca290452

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Restructure the way libpam-sys-impls works to fix cross-compilation. The previous structure of libpam-sys-impls meant that things got confusing (including for me) between what constants were build-time and what constants were run-time. This broke cross-compilation. This simplifies the way that works so that `libpam-sys-impls` has *no* build script itself and is intended mostly as a library to be included in other libraries' build scripts (while also exporting the PamImpl enum).
author Paul Fisher <paul@pfish.zone>
date Sat, 02 Aug 2025 18:47:46 -0400
parents 0730f5f2ee2a
children e915c54097d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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995aca290452 Restructure the way libpam-sys-impls works to fix cross-compilation.
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parents: 176
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1 use std::{env, fs};
995aca290452 Restructure the way libpam-sys-impls works to fix cross-compilation.
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2
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49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
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3 fn main() {
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4 println!("cargo:rustc-link-lib=pam");
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5 libpam_sys_impls::enable_pam_impl_cfg();
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6
995aca290452 Restructure the way libpam-sys-impls works to fix cross-compilation.
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7 let pam_impl = libpam_sys_impls::build_target_impl();
995aca290452 Restructure the way libpam-sys-impls works to fix cross-compilation.
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8 let impl_str = pam_impl.map(|i| format!("{i:?}")).unwrap_or("[undefined]".into());
995aca290452 Restructure the way libpam-sys-impls works to fix cross-compilation.
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9 println!("cargo:rustc-env=LIBPAMSYS_IMPL={impl_str}");
995aca290452 Restructure the way libpam-sys-impls works to fix cross-compilation.
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10 let output = match pam_impl {
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11 None => "".into(),
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12 Some(pam_impl) => {
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13 format!("\
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14 /// The implementation of PAM this library was built against.
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15 pub const CURRENT: PamImpl = PamImpl::{pam_impl:?};
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16 /// The name of the PAM implementation this library was built
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17 /// against, as a string.
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18 #[macro_export]
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19 macro_rules! pam_impl_name {{ () => {{ \"{pam_impl:?}\" }} }}
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20 pub(crate) use pam_impl_name;
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21 ")
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22 }
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23 };
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24 let outfile = format!("{out}/pam_impl_consts.rs", out = env::var("OUT_DIR").expect("missing OUT_DIR env var"));
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25 fs::write(outfile, output).expect("couldn't write output file");
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26 }