ss_sp     *byte
	ss_flags  int32
	pad_cgo_0 [4]byte
	ss_size   uintptr
}

type sigcontext struct {
	sc_pc         uint64
	sc_regs       [32]uint64
	sc_flags      uint32
	sc_extcontext [0]uint64
}

type ucontext struct {
	uc_flags     uint64
	uc_link      *ucontext
	uc_stack     stackt
	uc_sigmask   usigset
	uc_x_unused  [0]uint8
	uc_pad_cgo_0 [8]byte
	uc_mcontext  sigcontext

	}
	if opts.cpu != "" {
		run = append(run, "-cpu="+opts.cpu)
	}
	if t.json {
		run = append(run, "-json")
	}

	if opts.gcflags != "" {
		build = append(build, "-gcflags=all="+opts.gcflags)
	}
	if opts.ldflags != "" {
		build = append(build, "-ldflags="+opts.ldflags)
	}
	if opts.buildmode != "" {
		build = append(build, "-buildmode="+opts.buildmode)
	}

	pkgs = opts.packages()

	mc_fpformat      uint32
	mc_ownedfp       uint32
	mc_flags         uint32
	mc_fpstate       [128]uint32
	mc_fsbase        uint32
	mc_gsbase        uint32
	mc_xfpustate     uint32
	mc_xfpustate_len uint32
	mc_spare2        [4]uint32
}

type ucontext struct {
	uc_sigmask  sigset
	uc_mcontext mcontext
	uc_link     *ucontext
	uc_stack    stackt
	uc_flags    int32
	__spare__   [4]int32
	pad_cgo_0   [12]byte

	fp_flags int32
	pad      int32
}

type mcontext struct {
	mc_gpregs gpregs
	mc_fpregs fpregs
	mc_flags  int32
	mc_pad    int32
	mc_spare  [8]uint64
}

type ucontext struct {
	uc_sigmask  sigset
	uc_mcontext mcontext
	uc_link     *ucontext
	uc_stack    stackt
	uc_flags    int32
	__spare__   [4]int32
	pad_cgo_0   [12]byte
}

type timespec struct {
	tv_sec  int64

mkdir tmp5

# First build: no external linking expected
go build -ldflags=-tmpdir=tmp1 -o $devnull ./noUseOfCgo &

# Second build: using only "runtime/cgo", expect internal linking.
go build -ldflags=-tmpdir=tmp2 -o $devnull ./usesInternalCgo &

# Third build: program uses only "runtime/cgo", so we would normally
# expect internal linking, except that cflags contain suspicious entries

			// build C code (if any) and link with Go code
			cmd, err := cc(config.cFlags...)
			if err != nil {
				t.Fatalf("error running cc: %v", err)
			}
			cmd.Args = append(cmd.Args, config.ldFlags...)
			cmd.Args = append(cmd.Args, "-o", outPath, "-I", dir.Base())
			if tc.cSrc != "" {
				cmd.Args = append(cmd.Args, srcPath(tc.cSrc))
			}

	fp_flags int32
	fp_pad   int32
}

type mcontext struct {
	mc_gpregs gpregs
	mc_fpregs fpregs
	mc_flags  int32
	mc_pad    int32
	mc_spare  [8]uint64
}

type ucontext struct {
	uc_sigmask  sigset
	uc_mcontext mcontext
	uc_link     *ucontext
	uc_stack    stackt
	uc_flags    int32
	__spare__   [4]int32
	pad_cgo_0   [12]byte
}

type timespec struct {
	tv_sec  int64

	mc_r12           uint64
	mc_r13           uint64
	mc_r14           uint64
	mc_r15           uint64
	mc_trapno        uint32
	mc_fs            uint16
	mc_gs            uint16
	mc_addr          uint64
	mc_flags         uint32
	mc_es            uint16
	mc_ds            uint16
	mc_err           uint64
	mc_rip           uint64
	mc_cs            uint64
	mc_rflags        uint64
	mc_rsp           uint64

			cmdline := []string{"build", "-gcflags", "-S=2"}

			// Append flags, but don't override -gcflags=-S=2; add to it instead.
			for i := 0; i < len(flags); i++ {
				flag := flags[i]
				switch {
				case strings.HasPrefix(flag, "-gcflags="):
					cmdline[2] += " " + strings.TrimPrefix(flag, "-gcflags=")
				case strings.HasPrefix(flag, "--gcflags="):

					Directives: p.Internal.Build.XTestDirectives,
				},
				Imports:    ximports,
				RawImports: rawXTestImports,

				Asmflags:       p.Internal.Asmflags,
				Gcflags:        p.Internal.Gcflags,
				Ldflags:        p.Internal.Ldflags,
				Gccgoflags:     p.Internal.Gccgoflags,
				Embed:          xtestEmbed,
				OrigImportPath: p.Internal.OrigImportPath,
				PGOProfile:     p.Internal.PGOProfile,
			},
		}