var set_crosscall2 func()

// cgoHasExtraM is set on startup when an extra M is created for cgo.
// The extra M must be created before any C/C++ code calls cgocallback.
var cgoHasExtraM bool

// cgoUse is called by cgo-generated code (using go:linkname to get at
// an unexported name). The calls serve two purposes:
// 1) they are opaque to escape analysis, so the argument is considered to
// escape to the heap.

Carlos Amedee <******@****.***> 1715265901 -0400

// On those systems the cgo resolver does not require the cgo tool.
// (The term "cgo resolver" was locked in by GODEBUG settings
// at a time when the cgo resolver did require the cgo tool.)
//
// Adding netdns=go to GODEBUG will prefer the go resolver.
// Adding netdns=cgo to GODEBUG will prefer the cgo resolver.
//
// The Resolver struct has a PreferGo field that user code
// may set to prefer the go resolver. It is documented as being

environment variable when running the go tool: set it to 1 to enable
the use of cgo, and to 0 to disable it. The go tool will set the
build constraint "cgo" if cgo is enabled. The special import "C"
implies the "cgo" build constraint, as though the file also said
"//go:build cgo".  Therefore, if cgo is disabled, files that import
"C" will not be built by the go tool. (For more about build constraints

# Issue #66456

[!cgo] skip
[GOOS:windows] skip
[GOOS:plan9] skip

# Generate a file with a very long #cgo LDFLAGS line.
# This used to cause "go build" to fail with "argument list too long".
go generate

# Build with the generated file.
go build

-- go.mod --
module cgolongcmd

go 1.22
-- generate.go --
//go:build ignore

package main

import (
	"fmt"
	"log"
	"os"
	"bytes"
)

	"unsafe"
)

// Addresses collected in a cgo backtrace when crashing.
// Length must match arg.Max in x_cgo_callers in runtime/cgo/gcc_traceback.c.
type cgoCallers [32]uintptr

// argset matches runtime/cgo/linux_syscall.c:argset_t
type argset struct {
	args   unsafe.Pointer
	retval uintptr
}

// wrapper for syscall package to call cgocall for libc (cgo) calls.
//

[!fuzz] skip
[!cgo] skip
[short] skip
env GOCACHE=$WORK/cache

# Test that fuzzing works with cgo (issue 65169)

go test -fuzz=. -fuzztime=1x
stdout ok
! stdout FAIL

-- go.mod --
module example.com/p

go 1.20
-- c.go --
package p

import "C"
-- c_test.go --
package p

import "testing"

func Fuzz(f *testing.F) {
	f.Add(0)
	f.Fuzz(func(t *testing.T, x int) {})

# building the commands.
#
# CGO_ENABLED: Controls cgo usage during the build. Set it to 1
# to include all cgo related files, .c and .go file with "cgo"
# build directive, in the build. Set it to 0 to ignore them.
#
# GO_EXTLINK_ENABLED: Set to 1 to invoke the host linker when building
# packages that use cgo.  Set to 0 to do all linking internally.  This

	< image/gif, image/jpeg, image/png;

	# cgo, delayed as long as possible.
	# If you add a dependency on CGO, you must add the package
	# to cgoPackages in cmd/dist/test.go as well.
	RUNTIME
	< C
	< runtime/cgo
	< CGO
	< runtime/msan, runtime/asan;

	# runtime/race
	NONE < runtime/race/internal/amd64v1;
	NONE < runtime/race/internal/amd64v3;

		CoroCgo(callerStopCallback, iterNested)
	})
}

var toCall func()

//export go_callback_coro
func go_callback_coro(handle C.uintptr_t) {
	h := cgo.Handle(handle)
	h.Value().(func())()
	h.Delete()
}

func callFromC(f func()) {
	C.call_go(C.uintptr_t(cgo.NewHandle(f)))
}

func CoroCgo(driver func(iter.Seq[int]) error, seq iter.Seq[int]) {
	if err := driver(seq); err != nil {
		println("error:", err.Error())