sys/syz-sysgen: remove all files in the case set of arches has changed

If arched are renamed, old files will stay around and break builds.
Remove all existing generated files for writing new ones.

1 files changed, 12 insertions, 0 deletions

diff --git a/sys/syz-sysgen/sysgen.go b/sys/syz-sysgen/sysgen.go
index b1ed731bb..f170ad410 100644
--- a/sys/syz-sysgen/sysgen.go
+++ b/sys/syz-sysgen/sysgen.go
@@ -91,6 +91,18 @@ func main() {
 		}
 		osutil.MkdirAll(filepath.Join(*outDir, "sys", OS, "gen"))
 
+		// Cleanup old files in the case set of architectures has chnaged.
+		allFiles, err := filepath.Glob(filepath.Join(*outDir, "sys", OS, "gen", "*.go"))
+		if err != nil {
+			tool.Failf("failed to glob: %v", err)
+		}
+		for _, file := range allFiles {
+			if strings.HasSuffix(file, "empty.go") {
+				continue
+			}
+			os.Remove(file)
+		}
+
 		var archs []string
 		for arch := range targets.List[OS] {
 			archs = append(archs, arch)