build: let llgo build without -o outputs executable

compiler/internal/build/build.go

@@ -206,7 +206,7 @@ func Do(args []string, conf *Config) ([]Package, error) {
 	env := llvm.New("")
 	os.Setenv("PATH", env.BinDir()+":"+os.Getenv("PATH")) // TODO(xsw): check windows
 
-	output := mode != ModeBuild || conf.OutFile != ""
+	output := conf.OutFile != ""
 	ctx := &context{env, cfg, progSSA, prog, dedup, patches, make(map[string]none), initial, mode, 0, output, make(map[*packages.Package]bool), make(map[*packages.Package]bool)}
 	pkgs, err := buildAllPkgs(ctx, initial, verbose)
 	check(err)
@@ -226,13 +226,12 @@ func Do(args []string, conf *Config) ([]Package, error) {
 		linkArgs = append(linkArgs, pkg.LinkArgs...)
 	}
 
-	if ctx.output {
 	for _, pkg := range initial {
 		if needLink(pkg, mode) {
 			linkMainPkg(ctx, pkg, pkgs, linkArgs, conf, mode, verbose)
 		}
 	}
-	}
+
 	return dpkg, nil
 }
 
@@ -610,7 +609,6 @@ func buildPkg(ctx *context, aPkg *aPackage, verbose bool) (cgoLdflags []string,
 		}
 		cgoLdflags = append(cgoLdflags, altLdflags...)
 	}
-	if ctx.output {
 	pkg.ExportFile += ".ll"
 	os.WriteFile(pkg.ExportFile, []byte(ret.String()), 0644)
 	if debugBuild || verbose {
@@ -621,7 +619,6 @@ func buildPkg(ctx *context, aPkg *aPackage, verbose bool) (cgoLdflags []string,
 			fmt.Fprintf(os.Stderr, "==> lcc %v: %v\n%v\n", pkg.PkgPath, pkg.ExportFile, msg)
 		}
 	}
-	}
 	return
 }