Implement llgo build mode support (#1197)

- Add BuildMode type with three build modes: exe, c-archive, c-shared
- Restrict buildmode flag to llgo build command only (not run/install/test)
- Implement build mode specific linker arguments:
  - c-shared: use -shared -fPIC flags
  - c-archive: use ar tool to create static archive
  - exe: default executable mode
- Add normalizeOutputPath function for platform-specific file naming conventions
- Generate C header files for library modes
- Fix buildmode flag conflict by removing from PassArgs
- Add comprehensive test coverage for all build modes
- Resolve duplicate logic between defaultAppExt and normalizeOutputPath

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

cmd/internal/base/pass.go

@@ -75,7 +75,7 @@ func PassBuildFlags(cmd *Command) *PassArgs {
 	p.Bool("a")
 	p.Bool("linkshared", "race", "msan", "asan",
 		"trimpath", "work")
-	p.Var("p", "asmflags", "compiler", "buildmode",
+	p.Var("p", "asmflags", "compiler",
 		"gcflags", "gccgoflags", "installsuffix",
 		"ldflags", "pkgdir", "toolexec", "buildvcs")
 	return p

cmd/internal/build/build.go

@@ -39,6 +39,7 @@ func init() {
 
 	flags.AddCommonFlags(&Cmd.Flag)
 	flags.AddBuildFlags(&Cmd.Flag)
+	flags.AddBuildModeFlags(&Cmd.Flag)
 	flags.AddEmulatorFlags(&Cmd.Flag)
 	flags.AddEmbeddedFlags(&Cmd.Flag)
 	flags.AddOutputFlags(&Cmd.Flag)
@@ -51,7 +52,10 @@ func runCmd(cmd *base.Command, args []string) {
 	}
 
 	conf := build.NewDefaultConf(build.ModeBuild)
-	flags.UpdateConfig(conf)
+	if err := flags.UpdateBuildConfig(conf); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		mockable.Exit(1)
+	}
 
 	args = cmd.Flag.Args()
 

cmd/internal/flags/flags.go

@@ -25,6 +25,7 @@ func AddOutputFlags(fs *flag.FlagSet) {
 
 var Verbose bool
 var BuildEnv string
+var BuildMode string
 var Tags string
 var Target string
 var Emulator bool
@@ -52,6 +53,10 @@ func AddBuildFlags(fs *flag.FlagSet) {
 	}
 }
 
+func AddBuildModeFlags(fs *flag.FlagSet) {
+	fs.StringVar(&BuildMode, "buildmode", "exe", "Build mode (exe, c-archive, c-shared)")
+}
+
 var Gen bool
 
 func AddEmulatorFlags(fs *flag.FlagSet) {
@@ -68,12 +73,13 @@ func AddCmpTestFlags(fs *flag.FlagSet) {
 	fs.BoolVar(&Gen, "gen", false, "Generate llgo.expect file")
 }
 
-func UpdateConfig(conf *build.Config) {
+func UpdateConfig(conf *build.Config) error {
 	conf.Tags = Tags
 	conf.Verbose = Verbose
 	conf.Target = Target
 	conf.Port = Port
 	conf.BaudRate = BaudRate
+
 	switch conf.Mode {
 	case build.ModeBuild:
 		conf.OutFile = OutputFile
@@ -99,4 +105,20 @@ func UpdateConfig(conf *build.Config) {
 		conf.GenLL = GenLLFiles
 		conf.ForceEspClang = ForceEspClang
 	}
+	return nil
+}
+
+func UpdateBuildConfig(conf *build.Config) error {
+	// First apply common config
+	if err := UpdateConfig(conf); err != nil {
+		return err
+	}
+
+	// Validate and set build mode
+	if err := build.ValidateBuildMode(BuildMode); err != nil {
+		return err
+	}
+	conf.BuildMode = build.BuildMode(BuildMode)
+
+	return nil
 }

cmd/internal/install/install.go

@@ -47,7 +47,10 @@ func runCmd(cmd *base.Command, args []string) {
 	}
 
 	conf := build.NewDefaultConf(build.ModeInstall)
-	flags.UpdateConfig(conf)
+	if err := flags.UpdateConfig(conf); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		mockable.Exit(1)
+	}
 
 	args = cmd.Flag.Args()
 	_, err := build.Do(args, conf)

cmd/internal/run/run.go

@@ -76,7 +76,10 @@ func runCmdEx(cmd *base.Command, args []string, mode build.Mode) {
 	}
 
 	conf := build.NewDefaultConf(mode)
-	flags.UpdateConfig(conf)
+	if err := flags.UpdateConfig(conf); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		mockable.Exit(1)
+	}
 
 	args = cmd.Flag.Args()
 	args, runArgs, err := parseRunArgs(args)

cmd/internal/test/test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/goplus/llgo/cmd/internal/base"
 	"github.com/goplus/llgo/cmd/internal/flags"
 	"github.com/goplus/llgo/internal/build"
+	"github.com/goplus/llgo/internal/mockable"
 )
 
 // llgo test
@@ -30,12 +31,15 @@ func runCmd(cmd *base.Command, args []string) {
 	}
 
 	conf := build.NewDefaultConf(build.ModeTest)
-	flags.UpdateConfig(conf)
+	if err := flags.UpdateConfig(conf); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		mockable.Exit(1)
+	}
 
 	args = cmd.Flag.Args()
 	_, err := build.Do(args, conf)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
-		os.Exit(1)
+		mockable.Exit(1)
 	}
 }

internal/build/build.go

@@ -66,6 +66,24 @@ const (
 	ModeGen
 )
 
+type BuildMode string
+
+const (
+	BuildModeExe      BuildMode = "exe"
+	BuildModeCArchive BuildMode = "c-archive"
+	BuildModeCShared  BuildMode = "c-shared"
+)
+
+// ValidateBuildMode checks if the build mode is valid
+func ValidateBuildMode(mode string) error {
+	switch BuildMode(mode) {
+	case BuildModeExe, BuildModeCArchive, BuildModeCShared:
+		return nil
+	default:
+		return fmt.Errorf("invalid build mode %q, must be one of: exe, c-archive, c-shared", mode)
+	}
+}
+
 type AbiMode = cabi.Mode
 
 const (
@@ -104,6 +122,7 @@ type Config struct {
 	BaudRate      int     // baudrate for serial communication
 	RunArgs       []string
 	Mode          Mode
+	BuildMode     BuildMode // Build mode: exe, c-archive, c-shared
 	AbiMode       AbiMode
 	GenExpect     bool // only valid for ModeCmpTest
 	Verbose       bool
@@ -136,11 +155,12 @@ func NewDefaultConf(mode Mode) *Config {
 		goarch = runtime.GOARCH
 	}
 	conf := &Config{
-		Goos:    goos,
-		Goarch:  goarch,
-		BinPath: bin,
-		Mode:    mode,
-		AbiMode: cabi.ModeAllFunc,
+		Goos:      goos,
+		Goarch:    goarch,
+		BinPath:   bin,
+		Mode:      mode,
+		BuildMode: BuildModeExe,
+		AbiMode:   cabi.ModeAllFunc,
 	}
 	return conf
 }
@@ -156,23 +176,6 @@ func envGOPATH() (string, error) {
 	return filepath.Join(home, "go"), nil
 }
 
-func defaultAppExt(conf *Config) string {
-	if conf.Target != "" {
-		if strings.HasPrefix(conf.Target, "wasi") || strings.HasPrefix(conf.Target, "wasm") {
-			return ".wasm"
-		}
-		return ".elf"
-	}
-
-	switch conf.Goos {
-	case "windows":
-		return ".exe"
-	case "wasi", "wasip1", "js":
-		return ".wasm"
-	}
-	return ""
-}
-
 // -----------------------------------------------------------------------------
 
 const (
@@ -361,12 +364,21 @@ func Do(args []string, conf *Config) ([]Package, error) {
 				return nil, err
 			}
 
-			// Link main package using the base output path
+			// Link main package using the output path from buildOutFmts
 			err = linkMainPkg(ctx, pkg, allPkgs, global, outFmts.Out, verbose)
 			if err != nil {
 				return nil, err
 			}
 
+			// Generate C headers for c-archive and c-shared modes before linking
+			if ctx.buildConf.BuildMode == BuildModeCArchive || ctx.buildConf.BuildMode == BuildModeCShared {
+				headerErr := generateCHeader(ctx, pkg, outFmts.Out, verbose)
+				if headerErr != nil {
+					return nil, headerErr
+				}
+				continue
+			}
+
 			envMap := outFmts.ToEnvMap()
 
 			// Only convert formats when Target is specified
@@ -794,13 +806,69 @@ func linkMainPkg(ctx *context, pkg *packages.Package, pkgs []*aPackage, global l
 		}
 	}
 
-	return linkObjFiles(ctx, outputPath, objFiles, linkArgs, verbose)
+	err = linkObjFiles(ctx, outputPath, objFiles, linkArgs, verbose)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// TODO(lijie): export C header from function list of the pkg
+func generateCHeader(ctx *context, pkg *packages.Package, outputPath string, verbose bool) error {
+	// Determine header file path
+	headerPath := strings.TrimSuffix(outputPath, filepath.Ext(outputPath)) + ".h"
+
+	// Generate header content
+	headerContent := fmt.Sprintf(`/* Code generated by llgo; DO NOT EDIT. */
+
+#ifndef __%s_H_
+#define __%s_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __%s_H_ */
+`,
+		strings.ToUpper(strings.ReplaceAll(pkg.Name, "-", "_")),
+		strings.ToUpper(strings.ReplaceAll(pkg.Name, "-", "_")),
+		strings.ToUpper(strings.ReplaceAll(pkg.Name, "-", "_")))
+
+	// Write header file
+	err := os.WriteFile(headerPath, []byte(headerContent), 0644)
+	if err != nil {
+		return fmt.Errorf("failed to write header file %s: %w", headerPath, err)
+	}
+
+	if verbose {
+		fmt.Fprintf(os.Stderr, "Generated C header: %s\n", headerPath)
+	}
+
+	return nil
 }
 
 func linkObjFiles(ctx *context, app string, objFiles, linkArgs []string, verbose bool) error {
+	// Handle c-archive mode differently - use ar tool instead of linker
+	if ctx.buildConf.BuildMode == BuildModeCArchive {
+		return createStaticArchive(ctx, app, objFiles, verbose)
+	}
+
 	buildArgs := []string{"-o", app}
 	buildArgs = append(buildArgs, linkArgs...)
 
+	// Add build mode specific linker arguments
+	switch ctx.buildConf.BuildMode {
+	case BuildModeCShared:
+		buildArgs = append(buildArgs, "-shared", "-fPIC")
+	case BuildModeExe:
+		// Default executable mode, no additional flags needed
+	}
+
 	// Add common linker arguments based on target OS and architecture
 	if IsDbgSymsEnabled() {
 		buildArgs = append(buildArgs, "-gdwarf-4")
@@ -813,6 +881,27 @@ func linkObjFiles(ctx *context, app string, objFiles, linkArgs []string, verbose
 	return cmd.Link(buildArgs...)
 }
 
+func createStaticArchive(ctx *context, archivePath string, objFiles []string, verbose bool) error {
+	// Use ar tool to create static archive
+	args := []string{"rcs", archivePath}
+	args = append(args, objFiles...)
+
+	if verbose {
+		fmt.Fprintf(os.Stderr, "ar %s\n", strings.Join(args, " "))
+	}
+
+	cmd := exec.Command("ar", args...)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if verbose && len(output) > 0 {
+			fmt.Fprintf(os.Stderr, "ar output: %s\n", output)
+		}
+		return fmt.Errorf("ar command failed: %w", err)
+	}
+
+	return nil
+}
+
 func isWasmTarget(goos string) bool {
 	return slices.Contains([]string{"wasi", "js", "wasip1"}, goos)
 }

internal/build/outputs.go

@@ -47,46 +47,94 @@ func setOutFmt(conf *Config, formatName string) {
 }
 
 // buildOutFmts creates OutFmtDetails based on package, configuration and multi-package status
+// determineBaseNameAndDir extracts the base name and directory from configuration
+func determineBaseNameAndDir(pkgName string, conf *Config, multiPkg bool) (baseName, dir string) {
+	switch conf.Mode {
+	case ModeInstall:
+		return pkgName, conf.BinPath
+	case ModeBuild:
+		if !multiPkg && conf.OutFile != "" {
+			dir = filepath.Dir(conf.OutFile)
+			baseName = strings.TrimSuffix(filepath.Base(conf.OutFile), conf.AppExt)
+			if dir == "." {
+				dir = ""
+			}
+			return baseName, dir
+		}
+		return pkgName, ""
+	}
+	// Other modes (run, test, etc.)
+	return pkgName, ""
+}
+
+// applyPrefix applies build mode specific naming conventions
+func applyPrefix(baseName string, buildMode BuildMode, target string, goos string) string {
+	// Determine the effective OS for naming conventions
+	effectiveGoos := goos
+	if target != "" {
+		// Embedded targets follow Linux conventions
+		effectiveGoos = "linux"
+	}
+
+	switch buildMode {
+	case BuildModeCArchive:
+		// Static libraries: libname.a (add lib prefix if missing)
+		if !strings.HasPrefix(baseName, "lib") {
+			return "lib" + baseName
+		}
+		return baseName
+
+	case BuildModeCShared:
+		// Shared libraries: libname.so/libname.dylib (add lib prefix if missing, except on Windows)
+		if effectiveGoos != "windows" && !strings.HasPrefix(baseName, "lib") {
+			return "lib" + baseName
+		}
+		return baseName
+
+	case BuildModeExe:
+		// Executables: name or name.exe (no lib prefix)
+		if strings.HasPrefix(baseName, "lib") {
+			return strings.TrimPrefix(baseName, "lib")
+		}
+		return baseName
+	}
+
+	return baseName
+}
+
+// buildOutputPath creates the final output path from baseName, dir and other parameters
+func buildOutputPath(baseName, dir string, conf *Config, multiPkg bool, appExt string) (string, error) {
+	baseName = applyPrefix(baseName, conf.BuildMode, conf.Target, conf.Goos)
+
+	if dir != "" {
+		return filepath.Join(dir, baseName+appExt), nil
+	} else if (conf.Mode == ModeBuild && multiPkg) || (conf.Mode != ModeBuild && conf.Mode != ModeInstall) {
+		return genTempOutputFile(baseName, appExt)
+	} else {
+		return baseName + appExt, nil
+	}
+}
+
 func buildOutFmts(pkgName string, conf *Config, multiPkg bool, crossCompile *crosscompile.Export) (*OutFmtDetails, error) {
 	details := &OutFmtDetails{}
-	var err error
+
+	// Determine base name and directory
+	baseName, dir := determineBaseNameAndDir(pkgName, conf, multiPkg)
+
+	// Build output path
+	outputPath, err := buildOutputPath(baseName, dir, conf, multiPkg, conf.AppExt)
+	if err != nil {
+		return nil, err
+	}
+	details.Out = outputPath
+
 	if conf.Target == "" {
-		// Native target
-		if conf.Mode == ModeInstall {
-			details.Out = filepath.Join(conf.BinPath, pkgName+conf.AppExt)
-		} else if conf.Mode == ModeBuild && !multiPkg && conf.OutFile != "" {
-			base := strings.TrimSuffix(conf.OutFile, conf.AppExt)
-			details.Out = base + conf.AppExt
-		} else if conf.Mode == ModeBuild && !multiPkg {
-			details.Out = pkgName + conf.AppExt
-		} else {
-			details.Out, err = genTempOutputFile(pkgName, conf.AppExt)
-			if err != nil {
-				return nil, err
-			}
-		}
+		// Native target - we're done
 		return details, nil
 	}
 
 	needRun := slices.Contains([]Mode{ModeRun, ModeTest, ModeCmpTest, ModeInstall}, conf.Mode)
 
-	if multiPkg {
-		details.Out, err = genTempOutputFile(pkgName, conf.AppExt)
-		if err != nil {
-			return nil, err
-		}
-	} else if conf.OutFile != "" {
-		base := strings.TrimSuffix(conf.OutFile, conf.AppExt)
-		details.Out = base + conf.AppExt
-	} else if conf.Mode == ModeBuild {
-		details.Out = pkgName + conf.AppExt
-	} else {
-		details.Out, err = genTempOutputFile(pkgName, conf.AppExt)
-		if err != nil {
-			return nil, err
-		}
-	}
-
 	// Check emulator format if emulator mode is enabled
 	outFmt := ""
 	if needRun {
@@ -163,3 +211,39 @@ func (details *OutFmtDetails) ToEnvMap() map[string]string {
 
 	return envMap
 }
+
+func defaultAppExt(conf *Config) string {
+	// Handle build mode specific extensions first
+	switch conf.BuildMode {
+	case BuildModeCArchive:
+		return ".a"
+	case BuildModeCShared:
+		switch conf.Goos {
+		case "windows":
+			return ".dll"
+		case "darwin":
+			return ".dylib"
+		default:
+			return ".so"
+		}
+	case BuildModeExe:
+		// For executable mode, handle target-specific logic
+		if conf.Target != "" {
+			if strings.HasPrefix(conf.Target, "wasi") || strings.HasPrefix(conf.Target, "wasm") {
+				return ".wasm"
+			}
+			return ".elf"
+		}
+
+		switch conf.Goos {
+		case "windows":
+			return ".exe"
+		case "wasi", "wasip1", "js":
+			return ".wasm"
+		}
+		return ""
+	}
+
+	// This should not be reached, but kept for safety
+	return ""
+}

internal/build/outputs_test.go

@@ -364,3 +364,241 @@ func TestBuildOutFmtsNativeTarget(t *testing.T) {
 		})
 	}
 }
+
+func TestBuildOutFmtsBuildModes(t *testing.T) {
+	tests := []struct {
+		name        string
+		pkgName     string
+		buildMode   BuildMode
+		outFile     string
+		mode        Mode
+		target      string
+		goos        string
+		appExt      string
+		expectedOut string
+	}{
+		// C-Archive tests
+		{
+			name:        "c_archive_build_linux",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCArchive,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "linux",
+			appExt:      ".a",
+			expectedOut: "libmylib.a",
+		},
+		{
+			name:        "c_archive_build_with_outfile",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCArchive,
+			outFile:     "custom.a",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "linux",
+			appExt:      ".a",
+			expectedOut: "libcustom.a",
+		},
+		{
+			name:        "c_archive_build_with_path",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCArchive,
+			outFile:     "build/custom.a",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "linux",
+			appExt:      ".a",
+			expectedOut: "build/libcustom.a",
+		},
+
+		// C-Shared tests
+		{
+			name:        "c_shared_build_linux",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCShared,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "linux",
+			appExt:      ".so",
+			expectedOut: "libmylib.so",
+		},
+		{
+			name:        "c_shared_build_windows",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCShared,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "windows",
+			appExt:      ".dll",
+			expectedOut: "mylib.dll",
+		},
+		{
+			name:        "c_shared_build_darwin",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCShared,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "darwin",
+			appExt:      ".dylib",
+			expectedOut: "libmylib.dylib",
+		},
+		{
+			name:        "c_shared_embedded_target",
+			pkgName:     "mylib",
+			buildMode:   BuildModeCShared,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "rp2040",
+			goos:        "windows",
+			appExt:      ".so", // embedded follows linux rules
+			expectedOut: "libmylib.so",
+		},
+
+		// Executable tests
+		{
+			name:        "exe_build_linux",
+			pkgName:     "myapp",
+			buildMode:   BuildModeExe,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "linux",
+			appExt:      "",
+			expectedOut: "myapp",
+		},
+		{
+			name:        "exe_build_windows",
+			pkgName:     "myapp",
+			buildMode:   BuildModeExe,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "windows",
+			appExt:      ".exe",
+			expectedOut: "myapp.exe",
+		},
+		{
+			name:        "exe_remove_lib_prefix",
+			pkgName:     "libmyapp",
+			buildMode:   BuildModeExe,
+			outFile:     "",
+			mode:        ModeBuild,
+			target:      "",
+			goos:        "linux",
+			appExt:      "",
+			expectedOut: "myapp",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			conf := &Config{
+				Mode:      tt.mode,
+				BuildMode: tt.buildMode,
+				Target:    tt.target,
+				Goos:      tt.goos,
+				OutFile:   tt.outFile,
+				AppExt:    tt.appExt,
+			}
+
+			crossCompile := &crosscompile.Export{}
+			result, err := buildOutFmts(tt.pkgName, conf, false, crossCompile)
+
+			if err != nil {
+				t.Fatalf("buildOutFmts failed: %v", err)
+			}
+
+			if result.Out != tt.expectedOut {
+				t.Errorf("buildOutFmts(%q, buildMode=%v, target=%q, goos=%q) = %q, want %q",
+					tt.pkgName, tt.buildMode, tt.target, tt.goos, result.Out, tt.expectedOut)
+			}
+		})
+	}
+}
+
+func TestApplyBuildModeNaming(t *testing.T) {
+	tests := []struct {
+		name      string
+		baseName  string
+		buildMode BuildMode
+		target    string
+		goos      string
+		expected  string
+	}{
+		// Executable tests
+		{
+			name:      "exe_linux",
+			baseName:  "myapp",
+			buildMode: BuildModeExe,
+			target:    "",
+			goos:      "linux",
+			expected:  "myapp",
+		},
+		{
+			name:      "exe_remove_lib_prefix",
+			baseName:  "libmyapp",
+			buildMode: BuildModeExe,
+			target:    "",
+			goos:      "linux",
+			expected:  "myapp",
+		},
+
+		// C-Archive tests
+		{
+			name:      "c_archive_linux",
+			baseName:  "mylib",
+			buildMode: BuildModeCArchive,
+			target:    "",
+			goos:      "linux",
+			expected:  "libmylib",
+		},
+		{
+			name:      "c_archive_existing_prefix",
+			baseName:  "libmylib",
+			buildMode: BuildModeCArchive,
+			target:    "",
+			goos:      "linux",
+			expected:  "libmylib",
+		},
+
+		// C-Shared tests
+		{
+			name:      "c_shared_linux",
+			baseName:  "mylib",
+			buildMode: BuildModeCShared,
+			target:    "",
+			goos:      "linux",
+			expected:  "libmylib",
+		},
+		{
+			name:      "c_shared_windows",
+			baseName:  "mylib",
+			buildMode: BuildModeCShared,
+			target:    "",
+			goos:      "windows",
+			expected:  "mylib", // Windows doesn't use lib prefix
+		},
+		{
+			name:      "c_shared_embedded_rp2040",
+			baseName:  "mylib",
+			buildMode: BuildModeCShared,
+			target:    "rp2040",
+			goos:      "darwin",
+			expected:  "libmylib", // embedded follows linux rules
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := applyPrefix(tt.baseName, tt.buildMode, tt.target, tt.goos)
+			if result != tt.expected {
+				t.Errorf("applyBuildModeNaming(%q, %v, %q, %q) = %q, want %q",
+					tt.baseName, tt.buildMode, tt.target, tt.goos, result, tt.expected)
+			}
+		})
+	}
+}