compiler: pass -cflags and -ldflags to tinygo CLI command

Signed-off-by: Ron Evans <ron@hybridgroup.com>

compiler/compiler.go

@@ -32,7 +32,8 @@ func init() {
 type Config struct {
 	Triple     string   // LLVM target triple, e.g. x86_64-unknown-linux-gnu (empty string means default)
 	GC         string   // garbage collection strategy
-	CFlags     []string // flags to pass to cgo
+	CFlags     []string // cflags to pass to cgo
+	LDFlags    []string // ldflags to pass to cgo
 	DumpSSA    bool     // dump Go SSA, for compiler debugging
 	Debug      bool     // add debug symbols for gdb
 	RootDir    string   // GOROOT for TinyGo

main.go

@@ -34,6 +34,8 @@ type BuildConfig struct {
 	debug      bool
 	printSizes string
 	initInterp bool
+	cFlags     []string
+	ldFlags    []string
 }
 
 // Helper function for Compiler object.
@@ -41,10 +43,16 @@ func Compile(pkgName, outpath string, spec *TargetSpec, config *BuildConfig, act
 	if config.gc == "" && spec.GC != "" {
 		config.gc = spec.GC
 	}
+
+	// Append command line passed CFlags and LDFlags
+	spec.CFlags = append(spec.CFlags, config.cFlags...)
+	spec.LDFlags = append(spec.LDFlags, config.ldFlags...)
+
 	compilerConfig := compiler.Config{
 		Triple:     spec.Triple,
 		GC:         config.gc,
 		CFlags:     spec.CFlags,
+		LDFlags:    spec.LDFlags,
 		Debug:      config.debug,
 		DumpSSA:    config.dumpSSA,
 		RootDir:    sourceDir(),
@@ -497,6 +505,8 @@ func main() {
 	ocdOutput := flag.Bool("ocd-output", false, "print OCD daemon output during debug")
 	initInterp := flag.Bool("initinterp", true, "enable/disable partial evaluator of generated IR")
 	port := flag.String("port", "/dev/ttyACM0", "flash port")
+	cFlags := flag.String("cflags", "", "additional cflags for compiler")
+	ldFlags := flag.String("ldflags", "", "additional ldflags for linker")
 
 	if len(os.Args) < 2 {
 		fmt.Fprintln(os.Stderr, "No command-line arguments supplied.")
@@ -516,6 +526,14 @@ func main() {
 		initInterp: *initInterp,
 	}
 
+	if *cFlags != "" {
+		config.cFlags = strings.Split(*cFlags, " ")
+	}
+
+	if *ldFlags != "" {
+		config.ldFlags = strings.Split(*ldFlags, " ")
+	}
+
 	os.Setenv("CC", "clang -target="+*target)
 
 	switch command {