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self-contained linker: retry linking without -fuse-ld=lld on CCs that don't support it #125417

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May 23, 2024
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self-contained linker: retry linking without -fuse-ld=lld on CCs that don't support it #125417

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21 changes: 21 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 @@ -799,6 +799,27 @@ fn link_natively(
continue;
}

// Check if linking failed with an error message that indicates the driver didn't recognize
// the `-fuse-ld=lld` option. If so, re-perform the link step without it. This avoids having
// to spawn multiple instances on the happy path to do version checking, and ensures things
// keep working on the tier 1 baseline of GLIBC 2.17+. That is generally understood as GCCs
// circa RHEL/CentOS 7, 4.5 or so, whereas lld support was added in GCC 9.
if matches!(flavor, LinkerFlavor::Gnu(Cc::Yes, Lld::Yes))
&& unknown_arg_regex.is_match(&out)
&& out.contains("-fuse-ld=lld")
&& cmd.get_args().iter().any(|e| e.to_string_lossy() == "-fuse-ld=lld")
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{
info!("linker output: {:?}", out);
warn!("The linker driver does not support `-fuse-ld=lld`. Retrying without it.");
for arg in cmd.take_args() {
if arg.to_string_lossy() != "-fuse-ld=lld" {
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cmd.arg(arg);
}
}
info!("{:?}", &cmd);
continue;
}

// Detect '-static-pie' used with an older version of gcc or clang not supporting it.
// Fallback from '-static-pie' to '-static' in that case.
if matches!(flavor, LinkerFlavor::Gnu(Cc::Yes, _))
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