cmd/gogio: add -tags flag for supplying extra tags to the build

Signed-off-by: Elias Naur <mail@eliasnaur.com>

cmd/gogio/androidbuild.go

@@ -203,6 +203,7 @@ func compileAndroid(tmpDir string, tools *androidTools, bi *buildInfo) (err erro
 			"build",
 			"-ldflags=-w -s "+bi.ldflags,
 			"-buildmode=c-shared",
+			"-tags", bi.tags,
 			"-o", libFile,
 			bi.pkg,
 		)

cmd/gogio/help.go

@@ -34,6 +34,8 @@ and archive. Buildmode exe outputs an .ipa file for iOS or tvOS, an .apk file
 for Android or a directory with the WebAssembly module and support files for
 a browser.
 
+The -ldflags and -tags flags pass extra linker flags and tags to the go tool.
+
 As a special case for iOS or tvOS, specifying a path that ends with ".app"
 will output an app directory suitable for a simulator.
 

cmd/gogio/iosbuild.go

@@ -411,7 +411,7 @@ func archiveIOS(tmpDir, target, frameworkRoot string, bi *buildInfo) error {
 			"-ldflags=-s -w "+bi.ldflags,
 			"-buildmode=c-archive",
 			"-o", lib,
-			"-tags", "ios",
+			"-tags", "ios "+bi.tags,
 			bi.pkg,
 		)
 		lipo.Args = append(lipo.Args, lib)

cmd/gogio/jsbuild.go

@@ -22,6 +22,7 @@ func buildJS(bi *buildInfo) error {
 		"go",
 		"build",
 		"-ldflags="+bi.ldflags,
+		"-tags="+bi.tags,
 		"-o", filepath.Join(out, "main.wasm"),
 		bi.pkg,
 	)

cmd/gogio/main.go

@@ -33,12 +33,14 @@ var (
 	keepWorkdir   = flag.Bool("work", false, "print the name of the temporary work directory and do not delete it when exiting.")
 	linkMode      = flag.String("linkmode", "", "set the -linkmode flag of the go tool")
 	extraLdflags  = flag.String("ldflags", "", "extra flags to the Go linker")
+	extraTags     = flag.String("tags", "", "extra tags to the Go tool")
 )
 
 type buildInfo struct {
 	name    string
 	pkg     string
 	ldflags string
+	tags    string
 	target  string
 	appID   string
 	version int
@@ -96,6 +98,7 @@ func mainErr() error {
 		dir:     dir,
 		version: *version,
 		minsdk:  *minsdk,
+		tags:    *extraTags,
 	}
 	if bi.appID == "" {
 		bi.appID = appIDFromPackage(pkgPath)