c: `#ifdef _WIN32
		    __declspec(dllexport)
			#endif
		    extern unsigned char *GoFn21();`,
		support: `//export GoFn21
		          func GoFn21() *byte { return new(byte) }`,
		body: `C.GoFn21()`,
		fail: true,
	},
	{
		// Returning a C pointer is fine.
		name: "exportok",
		c: `#include <stdlib.h>
		    #ifdef _WIN32
		    __declspec(dllexport)
			#endif

	re(`-f(no-)?exceptions`),
	re(`-f(no-)?fast-math`),
	re(`-f(no-)?inline-functions`),
	re(`-finput-charset=([^@\-].*)`),
	re(`-f(no-)?fat-lto-objects`),
	re(`-f(no-)?keep-inline-dllexport`),
	re(`-f(no-)?lto`),
	re(`-fmacro-backtrace-limit=(.+)`),
	re(`-fmessage-length=(.+)`),
	re(`-f(no-)?modules`),
	re(`-f(no-)?objc-arc`),
	re(`-f(no-)?objc-nonfragile-abi`),
	re(`-f(no-)?objc-legacy-dispatch`),

			fmt.Fprintf(fgcch, "};\n")
			gccResult = "struct " + exp.ExpName + "_return"
		}

		// Build the wrapper function compiled by gcc.
		gccExport := ""
		if goos == "windows" {
			gccExport = "__declspec(dllexport) "
		}
		s := fmt.Sprintf("%s%s %s(", gccExport, gccResult, exp.ExpName)
		if fn.Recv != nil {
			s += p.cgoType(fn.Recv.List[0].Type).C.String()
			s += " recv"
		}
		forFieldList(fntype.Params,