These rules are checked dynamically at runtime. The checking is
controlled by the cgocheck setting of the GODEBUG environment
variable. The default setting is GODEBUG=cgocheck=1, which implements
reasonably cheap dynamic checks. These checks may be disabled
entirely using GODEBUG=cgocheck=0. Complete checking of pointer
handling, at some cost in run time, is available by setting
GOEXPERIMENT=cgocheck2 at build time.

pkg math/big, method (*Float) Rat(*Rat) (*Rat, Accuracy)
pkg math/big, method (*Float) Set(*Float) *Float
pkg math/big, method (*Float) SetFloat64(float64) *Float
pkg math/big, method (*Float) SetInf(bool) *Float
pkg math/big, method (*Float) SetInt(*Int) *Float
pkg math/big, method (*Float) SetInt64(int64) *Float
pkg math/big, method (*Float) SetMantExp(*Float, int) *Float
pkg math/big, method (*Float) SetMode(RoundingMode) *Float

	// Second, if ContentErr==nil, the content should match Content.
	// If content is large, an alternative to setting Content is to set File,
	// which names a file in the testdata/ directory containing the
	// uncompressed expected content.
	// If content is very large, an alternative to setting Content or File
	// is to set Size, which will then be checked against the header-reported size

pkg syscall (openbsd-386), const SIOCSVNETID ideal-int
pkg syscall (openbsd-386), const SYS_CLOCK_GETRES = 89
pkg syscall (openbsd-386), const SYS_CLOCK_GETTIME = 87
pkg syscall (openbsd-386), const SYS_CLOCK_SETTIME = 88
pkg syscall (openbsd-386), const SYS_FHSTATFS = 65
pkg syscall (openbsd-386), const SYS_FSTAT = 53
pkg syscall (openbsd-386), const SYS_FSTATAT = 42
pkg syscall (openbsd-386), const SYS_FSTATFS = 64

pkg syscall (netbsd-arm64-cgo), const FD_CLOEXEC = 1
pkg syscall (netbsd-arm64-cgo), const FD_CLOEXEC ideal-int
pkg syscall (netbsd-arm64-cgo), const FD_SETSIZE = 256
pkg syscall (netbsd-arm64-cgo), const FD_SETSIZE ideal-int
pkg syscall (netbsd-arm64-cgo), const F_DUPFD = 0
pkg syscall (netbsd-arm64-cgo), const F_DUPFD_CLOEXEC = 12
pkg syscall (netbsd-arm64-cgo), const F_DUPFD_CLOEXEC ideal-int

x[i], i = 2, 1  // set x[0] = 2, i = 1

x[0], x[0] = 1, 2  // set x[0] = 1, then x[0] = 2 (so x[0] == 2 at end)

x[1], x[3] = 4, 5  // set x[1] = 4, then panic setting x[3] = 5.

type Point struct { x, y int }
var p *Point
x[2], p.x = 6, 7  // set x[2] = 6, then panic setting p.x = 7

i = 2
x = []int{3, 5, 7}
for i, x[i] = range x {  // set i, x[2] = 0, x[0]
	break
}

	SETLE DL                                // 0f9ec2
	SETLE R11                               // 410f9ec3
	SETNE (BX)                              // 0f9503
	SETNE (R11)                             // 410f9503
	SETNE DL                                // 0f95c2
	SETNE R11                               // 410f95c3
	SETOC (BX)                              // 0f9103

If CC_FOR_TARGET is not set when the toolchain is built (make.bash or all.bash), CC
can be set on the command line. For example,

	GOOS=ios GOARCH=amd64 CGO_ENABLED=1 CC=$(go env GOROOT)/misc/ios/clangwrap.sh go build

Setting CC is not necessary if the toolchain is built with CC_FOR_TARGET set.

To use the go tool to run individual programs and tests, put $GOROOT/bin into PATH to ensure

The [`asynctimerchan` setting](/pkg/time/#NewTimer) disables this change.
There are no runtime metrics for this change,
This setting may be removed in a future release, Go 1.27 at the earliest.

Go 1.23 changed the mode bits reported by [`os.Lstat`](/pkg/os#Lstat) and [`os.Stat`](/pkg/os#Stat)
for reparse points, which can be controlled with the `winsymlink` setting.

pkg syscall (linux-386), const SYS_TIMERFD_SETTIME ideal-int
pkg syscall (linux-386), const SYS_TIMER_CREATE ideal-int
pkg syscall (linux-386), const SYS_TIMER_DELETE ideal-int
pkg syscall (linux-386), const SYS_TIMER_GETOVERRUN ideal-int
pkg syscall (linux-386), const SYS_TIMER_GETTIME ideal-int
pkg syscall (linux-386), const SYS_TIMER_SETTIME ideal-int
pkg syscall (linux-386), const SYS_TIMES ideal-int