Migrate the remaining run-make/coverage-reports tests over to run-coverage

To make it easier to verify that the output snapshots have been migrated
faithfully, this change adds some temporary helper code that lets us avoid
having to completely re-bless the existing snapshots.

A later change in this PR will then re-bless the tests and remove the temporary
helper code.

Author: Zalathar

src/tools/compiletest/src/runtest.rs

@@ -524,6 +524,14 @@ impl<'test> TestCx<'test> {
         let proc_res = self.run_llvm_tool("llvm-cov", |cmd| {
             cmd.args(["show", "--format=text", "--show-line-counts-or-regions"]);
 
+            // Temporarily ignore these files so that we can migrate the
+            // existing output snapshots mostly as-is.
+            // This code will be removed later in the same PR.
+            cmd.args([
+                "--ignore-filename-regex",
+                "(uses_crate.rs|uses_inline_crate.rs|unused_mod.rs)",
+            ]);
+
             cmd.arg("--Xdemangler");
             cmd.arg(self.config.rust_demangler_path.as_ref().unwrap());
 
@@ -690,6 +698,10 @@ impl<'test> TestCx<'test> {
         // Sort the file sections (not including the final empty "section").
         let except_last = sections.len() - 1;
         (&mut sections[..except_last]).sort();
+        // Temporarily sort the file sections in reverse order so that we can
+        // migrate the existing output snapshots mostly as-is.
+        // This code will be removed later in the same PR.
+        (&mut sections[..except_last]).sort_by(|a, b| b.cmp(a));
 
         // Join the file sections back into a flat list of lines, with
         // sections separated by blank lines.

tests/run-make/coverage/lib/doctest_crate.rs renamed to tests/run-coverage-rustdoc/auxiliary/doctest_crate.rs

@@ -1,4 +1,4 @@
-../coverage/doctest.rs:
+$DIR/doctest.rs:
     1|       |//! This test ensures that code from doctests is properly re-mapped.
     2|       |//! See <https://github.com/rust-lang/rust/issues/79417> for more info.
     3|       |//!
@@ -67,7 +67,7 @@
    63|       |//!     doctest_main()
    64|       |//! }
    65|       |//! ```
-   66|       |
+   66|       |// aux-build:doctest_crate.rs
    67|       |/// doctest attached to fn testing external code:
    68|       |/// ```
    69|      1|/// extern crate doctest_crate;
@@ -102,7 +102,7 @@
    98|       |// what affect it might have on diagnostic messages from the compiler, and whether anyone would care
    99|       |// if the indentation changed. I don't know if there is a more viable solution.
 
-../coverage/lib/doctest_crate.rs:
+$DIR/auxiliary/doctest_crate.rs:
     1|       |/// A function run only from within doctests
     2|      3|pub fn fn_run_in_doctests(conditional: usize) {
     3|      3|    match conditional {

tests/run-make/coverage-reports/expected_show_coverage.doctest.txt renamed to tests/run-coverage-rustdoc/doctest.coverage

@@ -63,7 +63,7 @@
 //!     doctest_main()
 //! }
 //! ```
-
+// aux-build:doctest_crate.rs
 /// doctest attached to fn testing external code:
 /// ```
 /// extern crate doctest_crate;

tests/run-make/coverage/doctest.rs renamed to tests/run-coverage-rustdoc/doctest.rs

@@ -1,6 +1,6 @@
 #![allow(unused_assignments, unused_variables)]
-// compile-flags: -C opt-level=3 # validates coverage now works with optimizations
-use std::fmt::Debug;
+// compile-flags: -C opt-level=3
+use std::fmt::Debug; // ^^ validates coverage now works with optimizations
 
 pub fn used_function() {
     // Initialize test constants in a way that cannot be determined at compile time, to ensure

tests/run-make/coverage/lib/inline_always_with_dead_code.rs renamed to tests/run-coverage/auxiliary/inline_always_with_dead_code.rs

@@ -1,7 +1,7 @@
 #![allow(unused_assignments, unused_variables)]
 
-// compile-flags: -C opt-level=3 # validates coverage now works with optimizations
-
+// compile-flags: -C opt-level=3
+// ^^ validates coverage now works with optimizations
 use std::fmt::Debug;
 
 pub fn used_function() {

tests/run-make/coverage/lib/unused_mod_helper.rs renamed to tests/run-coverage/auxiliary/unused_mod_helper.rs

@@ -1,6 +1,6 @@
-../coverage/issue-85461.rs:
+$DIR/issue-85461.rs:
     1|       |// Regression test for #85461: MSVC sometimes fail to link with dead code and #[inline(always)]
-    2|       |
+    2|       |// aux-build:inline_always_with_dead_code.rs
     3|       |extern crate inline_always_with_dead_code;
     4|       |
     5|       |use inline_always_with_dead_code::{bar, baz};
@@ -10,7 +10,7 @@
     9|      1|    baz::call_me();
    10|      1|}
 
-../coverage/lib/inline_always_with_dead_code.rs:
+$DIR/auxiliary/inline_always_with_dead_code.rs:
     1|       |// compile-flags: -Cinstrument-coverage -Ccodegen-units=4 -Copt-level=0
     2|       |
     3|       |#![allow(dead_code)]

tests/run-make/coverage/lib/used_crate.rs renamed to tests/run-coverage/auxiliary/used_crate.rs

@@ -1,5 +1,5 @@
 // Regression test for #85461: MSVC sometimes fail to link with dead code and #[inline(always)]
-
+// aux-build:inline_always_with_dead_code.rs
 extern crate inline_always_with_dead_code;
 
 use inline_always_with_dead_code::{bar, baz};