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Emit warning while outputs is not exe and prints linkage info #138139

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Merged
merged 4 commits into from
May 29, 2025
Merged

Emit warning while outputs is not exe and prints linkage info #138139

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c59b708
Emit warning while outputs is not exe and prints linkage info
xizheyin Mar 7, 2025
98bb597
Update compiler/rustc_codegen_ssa/src/back/link.rs
xizheyin May 2, 2025
72a9219
check all crate-type to find staticlib
xizheyin May 2, 2025
f66787a
Update compiler/rustc_codegen_ssa/src/back/link.rs
xizheyin May 2, 2025
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19 changes: 19 additions & 0 deletions compiler/rustc_codegen_ssa/src/back/link.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,23 @@ pub fn ensure_removed(dcx: DiagCtxtHandle<'_>, path: &Path) {
}
}

fn check_link_info_print_request(sess: &Session, crate_types: &[CrateType]) {
let print_native_static_libs =
sess.opts.prints.iter().any(|p| p.kind == PrintKind::NativeStaticLibs);
let has_staticlib = crate_types.iter().any(|ct| *ct == CrateType::Staticlib);
if print_native_static_libs {
if !has_staticlib {
sess.dcx()
.warn(format!("cannot output linkage information without staticlib crate-type"));
sess.dcx()
.note(format!("consider `--crate-type staticlib` to print linkage information"));
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Note that you can pass multiple crate types at the same time. In that case it does emit the output for the staticlib crate type, but with this PR it would give a warning anyway.

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Yes, I changed it to check for the presence of staticlib in crate-types.

} else if !sess.opts.output_types.should_link() {
sess.dcx()
.warn(format!("cannot output linkage information when --emit link is not passed"));
}
}
}

/// Performs the linkage portion of the compilation phase. This will generate all
/// of the requested outputs for this compilation session.
pub fn link_binary(
Expand Down Expand Up @@ -180,6 +197,8 @@ pub fn link_binary(
}
}

check_link_info_print_request(sess, &codegen_results.crate_info.crate_types);

// Remove the temporary object file and metadata if we aren't saving temps.
sess.time("link_binary_remove_temps", || {
// If the user requests that temporaries are saved, don't delete any.
Expand Down
5 changes: 5 additions & 0 deletions tests/ui/print-request/emit-warning-print-link-info-without-staticlib.rs
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@@ -0,0 +1,5 @@
//@ compile-flags: --print native-static-libs
//@ check-pass
//~? WARN cannot output linkage information without staticlib crate-type

fn main() {}
6 changes: 6 additions & 0 deletions tests/ui/print-request/emit-warning-print-link-info-without-staticlib.stderr
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
warning: cannot output linkage information without staticlib crate-type

note: consider `--crate-type staticlib` to print linkage information

warning: 1 warning emitted

3 changes: 3 additions & 0 deletions tests/ui/print-request/emit-warning-while-exe-and-print-link-info.rs
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@@ -0,0 +1,3 @@
//@ compile-flags: --print native-static-libs --crate-type staticlib --emit metadata
//@ check-pass
//~? WARN cannot output linkage information when --emit link is not passed
4 changes: 4 additions & 0 deletions tests/ui/print-request/emit-warning-while-exe-and-print-link-info.stderr
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@@ -0,0 +1,4 @@
warning: cannot output linkage information when --emit link is not passed

warning: 1 warning emitted

1 change: 1 addition & 0 deletions tests/ui/print-request/stability.rs
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Expand Up @@ -110,3 +110,4 @@ fn main() {}
//[check_cfg]~? ERROR the `-Z unstable-options` flag must also be passed to enable the `check-cfg` print option
//[supported_crate_types]~? ERROR the `-Z unstable-options` flag must also be passed to enable the `supported-crate-types` print option
//[target_spec_json]~? ERROR the `-Z unstable-options` flag must also be passed to enable the `target-spec-json` print option
//[native_static_libs]~? WARNING cannot output linkage information without staticlib crate-type
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