cmd/go: don't report non-go files in CompiledGoFiles

We save non-go files in the cached srcfiles file because we want the
non-go files for vet, but we shouldn't report them in CompiledGoFiles.
Filter them out before adding them to CompiledGoFiles.

Fixes #28749

Change-Id: I889d4bbf8c4ec1348584a62ef5e4f8b3f05e97da
Reviewed-on: https://go-review.googlesource.com/c/go/+/451285
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>

src/cmd/go/internal/work/exec.go

@@ -479,7 +479,7 @@ func (b *Builder) build(ctx context.Context, a *Action) (err error) {
 				p.BuildID = a.buildID
 			}
 			if need&needCompiledGoFiles != 0 {
-				if err := b.loadCachedSrcFiles(a); err == nil {
+				if err := b.loadCachedCompiledGoFiles(a); err == nil {
 					need &^= needCompiledGoFiles
 				}
 			}
@@ -488,7 +488,7 @@ func (b *Builder) build(ctx context.Context, a *Action) (err error) {
 		// Source files might be cached, even if the full action is not
 		// (e.g., go list -compiled -find).
 		if !cachedBuild && need&needCompiledGoFiles != 0 {
-			if err := b.loadCachedSrcFiles(a); err == nil {
+			if err := b.loadCachedCompiledGoFiles(a); err == nil {
 				need &^= needCompiledGoFiles
 			}
 		}
@@ -773,7 +773,7 @@ OverlayLoop:
 		need &^= needVet
 	}
 	if need&needCompiledGoFiles != 0 {
-		if err := b.loadCachedSrcFiles(a); err != nil {
+		if err := b.loadCachedCompiledGoFiles(a); err != nil {
 			return fmt.Errorf("loading compiled Go files from cache: %w", err)
 		}
 		need &^= needCompiledGoFiles
@@ -1040,28 +1040,30 @@ func (b *Builder) loadCachedVet(a *Action) error {
 	return nil
 }
 
-func (b *Builder) loadCachedSrcFiles(a *Action) error {
+func (b *Builder) loadCachedCompiledGoFiles(a *Action) error {
 	c := cache.Default()
 	list, _, err := c.GetBytes(cache.Subkey(a.actionID, "srcfiles"))
 	if err != nil {
 		return fmt.Errorf("reading srcfiles list: %w", err)
 	}
-	var files []string
+	var gofiles []string
 	for _, name := range strings.Split(string(list), "\n") {
 		if name == "" { // end of list
 			continue
+		} else if !strings.HasSuffix(name, ".go") {
+			continue
 		}
 		if strings.HasPrefix(name, "./") {
-			files = append(files, name[len("./"):])
+			gofiles = append(gofiles, name[len("./"):])
 			continue
 		}
 		file, err := b.findCachedObjdirFile(a, c, name)
 		if err != nil {
 			return fmt.Errorf("finding %s: %w", name, err)
 		}
-		files = append(files, file)
+		gofiles = append(gofiles, file)
 	}
-	a.Package.CompiledGoFiles = files
+	a.Package.CompiledGoFiles = gofiles
 	return nil
 }
 

src/cmd/go/testdata/script/list_compiled_files_issue28749.txt

@@ -0,0 +1,10 @@
+go list -compiled -f {{.CompiledGoFiles}} .
+! stdout 'foo.s'
+
+-- go.mod --
+module example.com/foo
+
+go 1.20
+-- foo.go --
+package foo
+-- foo.s --