// Rel calls [Clean] on the result.
func Rel(basepath, targpath string) (string, error) {
	baseVol := VolumeName(basepath)
	targVol := VolumeName(targpath)
	base := Clean(basepath)
	targ := Clean(targpath)
	if sameWord(targ, base) {
		return ".", nil
	}
	base = base[len(baseVol):]
	targ = targ[len(targVol):]
	if base == "." {
		base = ""

  linkDebug -> assembleDebug [dir=back]
  check -> build [dir=back]
  compileReleaseCpp -> linkRelease -> assembleRelease [dir=back]
  clean

  // Ensure ordering
  compileDebugCpp -> compileReleaseCpp -> clean [style=invis]
  {rank=same compileDebugCpp compileReleaseCpp clean}

  check -> assemble -> assembleDebug -> assembleRelease [style=invis]
  {rank=same check assemble assembleDebug assembleRelease}

  check -> build [dir=back]
  compileReleaseCpp -> createRelease -> assembleRelease [dir=back]
  clean

  // Ensure ordering
  compileDebugCpp -> compileReleaseCpp -> clean [style=invis]
  {rank=same compileDebugCpp compileReleaseCpp clean}

  assemble -> empty1 -> empty2 -> check [style=invis]
  {rank=same assemble check empty1 empty2}
  empty1[shape=plain, label=""]

    def "clean assemble with precompiled headers" () {
        given:
        runner.testGroup = 'pre-compiled header builds'
        runner.buildSpec {
            displayName("Using PCH")
            invocation {
                args("-PusePCH")
                tasksToRun("clean", "assemble")
            }
        }
        runner.baseline {

	// care".
	nlen, alen, slen := int(b[1]), int(b[2]), int(b[3])
	if nlen == 0xff {
		nlen = 0
	}
	if alen == 0xff {
		alen = 0
	}
	if slen == 0xff {
		slen = 0
	}
	l := 4 + nlen + alen + slen
	if len(b) < l {
		return 0, nil, errInvalidAddr
	}
	data := b[4:]
	var name string
	var addr []byte
	if nlen > 0 {
		name = string(data[:nlen])

        def snapshot = reportFile.snapshot()
        then:
        executedAndNotSkipped ":test", ":jacocoTestReport", ":jacocoTestCoverageVerification"
        reportFile.assertIsFile()

        when:
        succeeds "clean"
        then:
        reportFile.assertDoesNotExist()

        when:
        withBuildCache().run "jacocoTestReport", "jacocoTestCoverageVerification"
        then:

	"unsafe"
)

// The compiler emits calls to runtime.addCovMeta
// but this code has moved to rtcov.AddMeta.
func addCovMeta(p unsafe.Pointer, dlen uint32, hash [16]byte, pkgpath string, pkgid int, cmode uint8, cgran uint8) uint32 {
	id := rtcov.AddMeta(p, dlen, hash, pkgpath, pkgid, cmode, cgran)
	if id == 0 {
		throw("runtime.addCovMeta: coverage package map collision")
	}
	return id

        withBuildCache().run 'clean', cacheableTask

        then:
        executedAndNotSkipped(cacheableTask)
        cacheOperations.assertStoredToLocalCacheForTask(cacheableTask)
        cacheOperations.assertNotStoredToRemoteCacheForTask(cacheableTask)

        when:
        pullOnly()
        cacheOriginInputFile.text = 'remote'
        withBuildCache().run 'clean', cacheableTask

        then:

        def firstBuildId = buildInvocationId
        def firstBuildCacheKey = buildCacheKey(":write")
        originBuildInvocationId(":write") == null

        when:
        succeeds "clean", "write"

        then:
        skipped ":write"
        def secondBuildId = buildInvocationId
        firstBuildId != secondBuildId
        with(origin(":write")) {
            buildInvocationId == firstBuildId

            invocation {
                cleanTasks("clean")
                args("--build-cache")
            }
            warmUpCount = 2
            invocationCount = 4
        }
        runner.baseline {
            displayName("fully up-to-date")
        }
        runner.baseline {
            displayName("non-cached")
            invocation {
                cleanTasks('clean')
            }
            warmUpCount = 2