mustHaveDWARF(t)

	testRuntimeTypeAttr(t, "-ldflags=-linkmode=internal")
}

// External linking requires a host linker (https://golang.org/src/cmd/cgo/doc.go l.732)
func TestRuntimeTypeAttrExternal(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	testenv.MustHaveCGO(t)

	mustHaveDWARF(t)

	// Explicitly test external linking, for dsymutil compatibility on Darwin.
	if runtime.GOARCH == "ppc64" {

	}

	return deps, nil
}

// externalLinkingReason reports the reason external linking is required
// even for programs that do not use cgo, or the empty string if external
// linking is not required.
func externalLinkingReason(p *Package) (what string) {
	// Some targets must use external linking even inside GOROOT.
	if platform.MustLinkExternal(cfg.Goos, cfg.Goarch, false) {

			// Nothing to do, the relocation will be laid out in reloc
			return true
		}
		if target.IsExternal() {
			// External linker will do this relocation.
			return true
		}

		// Internal linking, build a PLT entry and change the relocation
		// target to that entry.
		if r.Add() != 0 {
			ldr.Errorf(s, "PLT call with non-zero addend (%v)", r.Add())
		}
		addpltsym(target, ldr, syms, targ)

	// tls and procid (thread) pointers. thr_new() requires the tls
	// pointers, though the tid pointers can be nil.
	// However, newosproc0 is currently unreachable because builds
	// utilizing c-shared/c-archive force external linking.
	param := thrparam{
		start_func: uintptr(fn),
		arg:        nil,
		stack_base: uintptr(stack), //+stacksize?
		stack_size: stacksize,
		child_tid:  nil, // minit will record tid
		parent_tid: nil,

			if s.ABI() != ABI0 {
				continue
			}
			// runtime.addmoduledata is a host ABI function, so it doesn't
			// need FUNCDATA anyway. Moreover, cmd/link has special logic
			// for linking it in eccentric build modes, which breaks if it
			// has FUNCDATA references (e.g., cmd/cgo/internal/testplugin).
			//
			// TODO(cherryyz): Fix cmd/link's handling of plugins (see
			// discussion on CL 523355).

`nativeLink__Variant__` (e.g. `nativeLinkDebug` and `nativeLinkRelease`) extends `main__Variant__Implementation`::
Used for linking the application.
This configuration contains the libraries of the application and is therefore used when invoking the Swift linker to link it.

// runtime.elf_restgpr1 with an appropriate offset based on the number
// register operations required when linking external objects which
// make these calls. For GPR/FPR saves, the minimum register value is
// 14, for VR it is 20.
//
// These are only used when linking such cgo code internally. Note, R12
// and R0 may be used in different ways than regular ELF compliant
// functions.

			// nothing to do, the relocation will be laid out in reloc
			return true
		}
		if target.IsExternal() {
			// External linker will do this relocation.
			return true
		}
		// Internal linking.
		if r.Add() != 0 {
			ldr.Errorf(s, "PLT reference with non-zero addend (%v)", r.Add())
		}
		// Build a PLT entry and change the relocation target to that entry.
		addpltsym(target, ldr, syms, targ)

`nativeLinkTest__Variant__` (e.g. `nativeLinkTest`) extends `test__Variant__ExecutableImplementation`::
Used for linking the unit test.
This configuration contains the libraries of the unit test and is therefore used when invoking the {cpp} linker to link it.

In addition, they attach the `xcTest` or `run` task to the `check` lifecycle task.
It also create the `testImplementation` dependency configuration.
Dependencies that are only needed for test compilation, linking and runtime may be added to this configuration.
The `xctest` script block behave similarly to a `application` or `library` script block.