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

			if err := os.WriteFile(cSrc, cMain, 0600); err != nil {
				t.Fatalf("failed to write C source file: %v", err)
			}

			dstBin := dir.Join(name)
			cmd, err := cc(config.cFlags...)
			if err != nil {
				t.Fatal(err)
			}
			cmd.Args = append(cmd.Args, config.ldFlags...)
			cmd.Args = append(cmd.Args, "-o", dstBin, cSrc, lib)
			mustRun(t, cmd)

			cmd = hangProneCmd(dstBin)
			replaceEnv(cmd, "LD_LIBRARY_PATH", ".")

			// 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

		t.Fatalf("failed to create mod file: %v", err)
	}

	// As of 2018-07-17, lldb doesn't support compressed DWARF, so
	// disable it for this test.
	cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags=all=-N -l", "-ldflags=-compressdwarf=false", "-o", "a.exe")
	cmd.Dir = dir
	cmd.Env = append(os.Environ(), "GOPATH=") // issue 31100
	out, err := cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("building source %v\n%s", err, out)

/*
// intentionally write the same LDFLAGS differently
// to test correct handling of LDFLAGS.
#cgo linux LDFLAGS: -L. -lcgosotest
#cgo dragonfly LDFLAGS: -L. -l cgosotest
#cgo freebsd LDFLAGS: -L. -l cgosotest
#cgo openbsd LDFLAGS: -L. -l cgosotest
#cgo solaris LDFLAGS: -L. -lcgosotest
#cgo netbsd LDFLAGS: -L. libcgosotest.so
#cgo darwin LDFLAGS: -L. libcgosotest.dylib
#cgo windows LDFLAGS: -L. libcgosotest.a

//sys	Dup2(from int, to int) (err error)
//sys	dup3(from int, to int, flags int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)
//sys	Fchmod(fd int, mode uint32) (err error)
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Flock(fd int, how int) (err error)
//sys	Fpathconf(fd int, name int) (val int, err error)
//sys	Fstat(fd int, stat *Stat_t) (err error)

//sys	Chdir(path string) (err error)
//sys	Chflags(path string, flags int) (err error)
//sys	Chmod(path string, mode uint32) (err error)
//sys	Chown(path string, uid int, gid int) (err error)
//sys	Chroot(path string) (err error)
//sys	Close(fd int) (err error)
//sys	Dup(fd int) (nfd int, err error)
//sys	Dup2(from int, to int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)

[compiler:gccgo] skip 'gccgo does not support -ldflags -X'
env GO111MODULE=off
go build run_go.go

# Apply identity function to GOPATH
exec ./run_go$GOEXE $GOPATH/src/my.pkg/main $GOPATH IDENTITY build -o $WORK/tmp/a.exe -ldflags -X=my.pkg.Text=linkXworked
exec $WORK/tmp/a.exe
stderr 'linkXworked'
rm $WORK/tmp/a.exe

[!GOOS:windows] stop 'rest of the tests only apply to Windows'

# Replace '\' with '/' in GOPATH