env TESTGO_VERSION=go1.21
env TESTGO_VERSION_SWITCH=switch

# First, test 'go mod download' outside of a module.
#
# There is no go.mod file into which we can record the selected toolchain,
# so unfortunately these version switches won't be as reproducible as other
# go commands, but that's still preferable to failing entirely or downloading
# a module zip that we don't understand.

# GOTOOLCHAIN=auto should run the newer toolchain
env GOTOOLCHAIN=auto

	} else if b.gccSupportsFlag(compiler, "-fdebug-prefix-map=a=b") {
		defs = append(defs, "-fdebug-prefix-map="+b.WorkDir+"=/tmp/go-build")
	}
	if b.gccSupportsFlag(compiler, "-gno-record-gcc-switches") {
		defs = append(defs, "-gno-record-gcc-switches")
	}
	return b.Shell(a).run(p.Dir, p.ImportPath, nil, compiler, "-Wall", "-g",
		"-I", a.Objdir, "-I", inc, "-o", ofile, defs, "-c", cfile)
}

    #  You can specify the handling type of procedure synonym.
    #   NONE - No handling. (default)
    #   INCLUDE - It includes procedure synonyms.
    #   SWITCH - It switches all normal procedures to procedure synonyms.
    #
    #; procedureSynonymHandlingType = NONE
    # - - - - - - - - - -/

    # /- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

	m.Inter = inter
	m.Type = typ
	// The hash is used in type switches. However, compiler statically generates itab's
	// for all interface/type pairs used in switches (which are added to itabTable
	// in itabsinit). The dynamically-generated itab's never participate in type switches,
	// and thus the hash is irrelevant.
	// Note: m.Hash is _not_ the hash used for the runtime itabTable hash table.

//
// runtime.cgocall (below) calls entersyscall so as not to block
// other goroutines or the garbage collector, and then calls
// runtime.asmcgocall(_cgo_Cfunc_f, frame).
//
// runtime.asmcgocall (in asm_$GOARCH.s) switches to the m->g0 stack
// (assumed to be an operating system-allocated stack, so safe to run
// gcc-compiled code on) and calls _cgo_Cfunc_f(frame).
//
// _cgo_Cfunc_f invokes the actual C function f with arguments

If a developer continuously changes a single file, there is likely no need to rebuild all the other files in the project.

However, what happens when the same developer switches to a new branch created last week?
The files are rebuilt, even though the developer is building something that has been built before.

This is where a *build cache* is helpful.

            " Version ${fixedScalaVersion} is not compatible with org.scala-sbt:zinc_2.13:" + ScalaBasePlugin.DEFAULT_ZINC_VERSION
        failureHasCause(expectedMessage)
    }

    def "trying to use an old version of Zinc switches to Gradle-supported version"() {
        settingsFile << """
            rootProject.name = "scala"
        """
        buildFile << """
            apply plugin: 'scala'

// systemstack calls fn directly and returns.
// Otherwise, systemstack is being called from the limited stack
// of an ordinary goroutine. In this case, systemstack switches
// to the per-OS-thread stack, calls fn, and switches back.
// It is common to use a func literal as the argument, in order
// to share inputs and outputs with the code around the call
// to system stack:
//
//	... set up y ...

type Extensions struct {
	// x-kubernetes-preserve-unknown-fields stops the API server
	// decoding step from pruning fields which are not specified
	// in the validation schema. This affects fields recursively,
	// but switches back to normal pruning behaviour if nested
	// properties or additionalProperties are specified in the schema.
	// False means that the pruning behaviour is inherited from the parent.
	// False does not mean to activate pruning.

	BYTE $0xC2; WORD $4
	RET // unreached; make assembler happy

// Trampoline to resume execution from exception handler.
// This is part of the control flow guard workaround.
// It switches stacks and jumps to the continuation address.
// DX and CX are set above at the end of sigtrampgo
// in the context that starts executing at sigresume.
TEXT runtime·sigresume(SB),NOSPLIT,$0
	MOVL	DX, SP
	JMP	CX