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make MCP510 behavior opt-in to avoid conflicts between the CLI and target flavors #113631

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Jul 13, 2023
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make MCP510 behavior opt-in to avoid conflicts between the CLI and target flavors #113631

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19 changes: 17 additions & 2 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 @@ -2970,10 +2970,25 @@ fn add_lld_args(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) {
return;
}

let self_contained_linker = sess.opts.cg.link_self_contained.linker();

// FIXME: some targets default to using `lld`, but users can only override the linker on the CLI
// and cannot yet select the precise linker flavor to opt out of that. See for example issue
// #113597 for the `thumbv6m-none-eabi` target: a driver is used, and its default linker
// conflicts with the target's flavor, causing unexpected arguments being passed.
//
// Until the new `LinkerFlavor`-like CLI options are stabilized, we only adopt MCP510's behavior
// if its dedicated unstable CLI flags are used, to keep the current sub-optimal stable
// behavior.
let using_mcp510 =
self_contained_linker || sess.opts.cg.linker_flavor.is_some_and(|f| f.is_unstable());
if !using_mcp510 && !unstable_use_lld {
return;
}

// 1. Implement the "self-contained" part of this feature by adding rustc distribution
// directories to the tool's search path.
let self_contained_linker = sess.opts.cg.link_self_contained.linker() || unstable_use_lld;
if self_contained_linker {
if self_contained_linker || unstable_use_lld {
for path in sess.get_tools_search_paths(false) {
cmd.arg({
let mut arg = OsString::from("-B");
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