}{
		{[]byte(`-r:foo -L/usr/white\ space/lib -lfoo\ bar -lbar\ baz`), []string{"-r:foo", "-L/usr/white space/lib", "-lfoo bar", "-lbar baz"}},
		{[]byte(`-lextra\ fun\ arg\\`), []string{`-lextra fun arg\`}},
		{[]byte("\textra     whitespace\r\n"), []string{"extra", "whitespace\r"}},
		{[]byte("     \r\n      "), []string{"\r"}},

	// are valid in the shell script we use for comparison.
	f.Add([]byte(`-r:foo -L/usr/white\ space/lib -lfoo\ bar -lbar\ baz`))
	f.Add([]byte(`-lextra\ fun\ arg\\`))
	f.Add([]byte("\textra     whitespace\r"))
	f.Add([]byte("     \r      "))
	f.Add([]byte(`"-r:foo" "-L/usr/white space/lib" "-lfoo bar" "-lbar baz"`))
	f.Add([]byte(`"-lextra fun arg\\"`))
	f.Add([]byte(`"     \r\n\      "`))
	f.Add([]byte(`""`))
	f.Add([]byte(``))

		if err := checkCompilerFlags("test", "test", f); err == nil {
			t.Errorf("missing error for %q", f)
		}
	}
}

var goodLinkerFlags = [][]string{
	{"-Fbar"},
	{"-lbar"},
	{"-Lbar"},
	{"-fpic"},
	{"-fno-pic"},
	{"-fPIC"},
	{"-fno-PIC"},
	{"-fpie"},
	{"-fno-pie"},
	{"-fPIE"},
	{"-fno-PIE"},
	{"-fsanitize=hands"},
	{"-g"},
	{"-ggdb"},
	{"-march=souza"},

rm _cgo_yy.go

# Reject #cgo CFLAGS: -fplugin=foo.so
cp x.go.txt x.go
cp y_fplugin.go.txt y.go
! go build x
stderr 'invalid flag in #cgo CFLAGS: -fplugin=foo.so'

# Reject #cgo CFLAGS: -lbar -fplugin=foo.so
cp y_lbar_fplugin.go.txt y.go
! go build x
stderr 'invalid flag in #cgo CFLAGS: -fplugin=foo.so'

# Reject #cgo pkg-config: -foo
cp y_pkgconfig_dash_foo.txt y.go
! go build x

TEXT ·Or8(SB), NOSPLIT, $0-9
	MOVD	ptr+0(FP), R3
	MOVBZ	val+8(FP), R4
	LWSYNC
again:
	LBAR	(R3), R6
	OR	R4, R6
	STBCCC	R6, (R3)
	BNE	again
	RET

// void ·And8(byte volatile*, byte);
TEXT ·And8(SB), NOSPLIT, $0-9
	MOVD	ptr+0(FP), R3
	MOVBZ	val+8(FP), R4
	LWSYNC
again:
	LBAR	(R3), R6
	AND	R4, R6
	STBCCC	R6, (R3)
	BNE	again
	RET

// func Or(addr *uint32, v uint32)

	"FNMADDCC",
	"FNMADDS",
	"FNMADDSCC",
	"FNMSUB",
	"FNMSUBCC",
	"FNMSUBS",
	"FNMSUBSCC",
	"FRSP",
	"FRSPCC",
	"FSUB",
	"FSUBCC",
	"FSUBS",
	"FSUBSCC",
	"ISEL",
	"MOVMW",
	"LBAR",
	"LHAR",
	"LSW",
	"LWAR",
	"LWSYNC",
	"MOVDBR",
	"MOVWBR",
	"MOVB",
	"MOVBU",
	"MOVBZ",
	"MOVBZU",
	"MOVH",
	"MOVHBR",
	"MOVHU",
	"MOVHZ",
	"MOVHZU",
	"MOVW",

	PASTECC R3, R4                  // 7c23270d
	COPY R3, R4                     // 7c23260c

	// load-and-reserve
	LBAR (R4)(R3*1),$1,R5           // 7ca32069
	LBAR (R4)(R0),$1,R5             // 7ca02069
	LBAR (R4),$0,R5                 // 7ca02068
	LBAR (R3),R5                    // 7ca01868
	LHAR (R4)(R3*1),$1,R5           // 7ca320e9
	LHAR (R4)(R0),$1,R5             // 7ca020e9

	"SO",
}

// plan9OpMap maps an Op to its Plan 9 mnemonics, if different than its GNU mnemonics.
var plan9OpMap = map[Op]string{
	LWARX:     "LWAR",
	LDARX:     "LDAR",
	LHARX:     "LHAR",
	LBARX:     "LBAR",
	LWAX:      "MOVW",
	LHAX:      "MOVH",
	LWAUX:     "MOVWU",
	LHAU:      "MOVHU",
	LHAUX:     "MOVHU",
	LDX:       "MOVD",
	LDUX:      "MOVDU",
	LWZX:      "MOVWZ",
	LWZUX:     "MOVWZU",

			p.To.Type = rt
			p.To.Reg = y
		}

	case ssa.OpPPC64LoweredAtomicAnd8,
		ssa.OpPPC64LoweredAtomicAnd32,
		ssa.OpPPC64LoweredAtomicOr8,
		ssa.OpPPC64LoweredAtomicOr32:
		// LWSYNC
		// LBAR/LWAR	(Rarg0), Rtmp
		// AND/OR	Rarg1, Rtmp
		// STBCCC/STWCCC Rtmp, (Rarg0)
		// BNE		-3(PC)
		ld := ppc64.ALBAR
		st := ppc64.ASTBCCC

		// atomic 8/32 and/or.
		// *arg0 &= (|=) arg1. arg2=mem. returns memory. auxint must be zero.
		// LBAR/LWAT	(Rarg0), Rtmp
		// AND/OR	Rarg1, Rtmp
		// STBCCC/STWCCC Rtmp, (Rarg0), Rtmp
		// BNE		Rtmp, -3(PC)
		{name: "LoweredAtomicAnd8", argLength: 3, reg: gpstore, asm: "AND", faultOnNilArg0: true, hasSideEffects: true},