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display note to increase debuginfo level when build deps fail

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it's only displayed when backtraces are requested
This commit is contained in:
Rémy Rakic 2022-03-21 15:15:15 +01:00
parent 937a08cabf
commit 881533b590
1 changed files with 15 additions and 1 deletions
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16
src/cargo/core/compiler/custom_build.rs
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@ -405,7 +405,21 @@ fn build_work(cx: &mut Context<'_, '_>, unit: &Unit) -> CargoResult<Job> {
},
true,
)
.with_context(|| format!("failed to run custom build command for `{}`", pkg_descr));
.with_context(|| {
let mut build_error_context = format!("failed to run custom build command for `{}`", pkg_descr);
// If we're opting into backtraces, mention that build dependencies' backtraces can
// be improved by setting a higher debuginfo level.
if let Ok(show_backtraces) = std::env::var("RUST_BACKTRACE") {
if show_backtraces != "0" {
build_error_context.push_str("\n\
note: To improve backtraces for build dependencies, make sure full debug info is turned on. \
More details at https://doc.rust-lang.org/cargo/reference/profiles.html#build-dependencies");
}
}
build_error_context
});
if let Err(error) = output {
insert_warnings_in_build_outputs(