The `debug/elf` package now defines [PT_OPENBSD_NOBTCFI]. This [ProgType] is
used to disable Branch Tracking Control Flow Integrity (BTCFI) enforcement

it is expected to work. It is disabled by default when cross-compiling
as well as when the CC environment variable is unset and the default
C compiler (typically gcc or clang) cannot be found on the system PATH.
You can override the default by setting the CGO_ENABLED
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

The environment variable `GODEBUG`
can hold a comma-separated list of these settings.
For example, if a Go program is running in an environment that contains

	GODEBUG=http2client=0,http2server=0

then that Go program will disable the use of HTTP/2 by default in both
the HTTP client and the HTTP server.
It is also possible to set the default `GODEBUG` for a given program
(discussed below).

// pointer types, because we generate code passing a struct ptr rather
// than using the typedef. This warning is expected and does not break
// a normal build.
// We can only disable -Wincompatible-pointer-types starting with GCC 5.

// #if __GNU_MAJOR__ >= 5
//
// #pragma GCC diagnostic ignored "-Wincompatible-pointer-types"
//
// typedef struct {
// 	int a;

which becomes an attribute for all the fields in the corresponding
field declaration. An empty tag string is equivalent to an absent tag.
The tags are made visible through a <a href="/pkg/reflect/#StructTag">reflection interface</a>
and take part in <a href="#Type_identity">type identity</a> for structs
but are otherwise ignored.
</p>

<pre>
struct {

				directive := fields[1]
				funcName := fields[2]
				if directive == "nocallback" {
					fatalf("#cgo nocallback disabled until Go 1.23")
					f.NoCallbacks[funcName] = true
				} else if directive == "noescape" {
					fatalf("#cgo noescape disabled until Go 1.23")
					f.NoEscapes[funcName] = true
				}
			}
		}
	}
	f.Preamble = strings.Join(linesOut, "\n")
}

pkg syscall (darwin-arm64), const EV_CLEAR ideal-int
pkg syscall (darwin-arm64), const EV_DELETE = 2
pkg syscall (darwin-arm64), const EV_DELETE ideal-int
pkg syscall (darwin-arm64), const EV_DISABLE = 8
pkg syscall (darwin-arm64), const EV_DISABLE ideal-int
pkg syscall (darwin-arm64), const EV_DISPATCH = 128
pkg syscall (darwin-arm64), const EV_DISPATCH ideal-int
pkg syscall (darwin-arm64), const EV_ENABLE = 4

pkg syscall (freebsd-arm64), const EV_CLEAR ideal-int
pkg syscall (freebsd-arm64), const EV_DELETE = 2
pkg syscall (freebsd-arm64), const EV_DELETE ideal-int
pkg syscall (freebsd-arm64), const EV_DISABLE = 8
pkg syscall (freebsd-arm64), const EV_DISABLE ideal-int
pkg syscall (freebsd-arm64), const EV_DISPATCH = 128
pkg syscall (freebsd-arm64), const EV_DISPATCH ideal-int
pkg syscall (freebsd-arm64), const EV_DROP = 4096

pkg syscall (freebsd-riscv64), const EV_DELETE = 2 #53466
pkg syscall (freebsd-riscv64), const EV_DELETE ideal-int #53466
pkg syscall (freebsd-riscv64), const EV_DISABLE = 8 #53466
pkg syscall (freebsd-riscv64), const EV_DISABLE ideal-int #53466
pkg syscall (freebsd-riscv64), const EV_DISPATCH = 128 #53466
pkg syscall (freebsd-riscv64), const EV_DISPATCH ideal-int #53466

pkg syscall (darwin-386), const EVFILT_WRITE = -2
pkg syscall (darwin-386), const EV_ADD = 1
pkg syscall (darwin-386), const EV_CLEAR = 32
pkg syscall (darwin-386), const EV_DELETE = 2
pkg syscall (darwin-386), const EV_DISABLE = 8
pkg syscall (darwin-386), const EV_DISPATCH = 128
pkg syscall (darwin-386), const EV_ENABLE = 4
pkg syscall (darwin-386), const EV_EOF = 32768
pkg syscall (darwin-386), const EV_ERROR = 16384