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Stabilize -Z instrument-coverage as -C instrument-coverage

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Continue supporting -Z instrument-coverage for compatibility for now,
but show a deprecation warning for it.

Update uses and documentation to use the -C option.

Move the documentation from the unstable book to stable rustc
documentation.
This commit is contained in:
Josh Triplett 2021-10-21 16:04:22 +02:00
parent ff94b3b12b
commit 34106f8935
23 changed files with 102 additions and 79 deletions
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4
compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs
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@ -37,7 +37,7 @@ pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
// LLVM 12.
let version = coverageinfo::mapping_version();
if version < 4 {
tcx.sess.fatal("rustc option `-Z instrument-coverage` requires LLVM 12 or higher.");
tcx.sess.fatal("rustc option `-C instrument-coverage` requires LLVM 12 or higher.");
}
debug!("Generating coverage map for CodegenUnit: `{}`", cx.codegen_unit.name());
@ -264,7 +264,7 @@ fn save_function_record(
/// (functions referenced by other "used" or public items). Any other functions considered unused,
/// or "Unreachable", were still parsed and processed through the MIR stage, but were not
/// codegenned. (Note that `-Clink-dead-code` can force some unused code to be codegenned, but
/// that flag is known to cause other errors, when combined with `-Z instrument-coverage`; and
/// that flag is known to cause other errors, when combined with `-C instrument-coverage`; and
/// `-Clink-dead-code` will not generate code for unused generic functions.)
///
/// We can find the unused functions (including generic functions) by the set difference of all MIR