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Fix -Z instrument-coverage on MSVC

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Found that -C link-dead-code (which was enabled automatically
under -Z instrument-coverage) was causing the linking error that
resulted in segmentation faults in coverage instrumented binaries. Link
dead code is now disabled under MSVC, allowing `-Z instrument-coverage`
to be enabled under MSVC for the first time.

More details are included in Issue #76038.

(This PR was broken out from PR #75828)
This commit is contained in:
Rich Kadel 2020-08-27 12:53:43 -07:00
parent 85fbf49ce0
commit ddb054aee8
6 changed files with 45 additions and 34 deletions
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2
compiler/rustc_middle/src/mir/mono.rs
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@ -86,7 +86,7 @@ impl<'tcx> MonoItem<'tcx> {
.debugging_opts
.inline_in_all_cgus
.unwrap_or_else(|| tcx.sess.opts.optimize != OptLevel::No)
&& tcx.sess.opts.cg.link_dead_code != Some(true);
&& !tcx.sess.link_dead_code();
match *self {
MonoItem::Fn(ref instance) => {