cmd/go: -C option not documented in go -h or go help

[willfaught]

Go version

go version go1.21.4 darwin/amd64

What operating system and processor architecture are you using (go env)?

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/Users/Will/Library/Caches/go-build'
GOENV='/Users/Will/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/Will/Library/Application Support/go/pkg/mod'
GONOPROXY='github.com/FrontRowXP,github.com/frontrowxp'
GONOSUMDB='github.com/FrontRowXP,github.com/frontrowxp'
GOOS='darwin'
GOPATH='/Users/Will/Library/Application Support/go'
GOPRIVATE='github.com/FrontRowXP,github.com/frontrowxp'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/Cellar/go/1.21.4/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/Cellar/go/1.21.4/libexec/pkg/tool/darwin_amd64'
GOVCS=''
GOVERSION='go1.21.4'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/Will/Developer/work/backend/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/bx/qk0phsxd265fqj512dnnpg080000gn/T/go-build1657097353=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

go -h
go help

What did you expect to see?

-C flag documented

What did you see instead?

No mention

[fzipp]

go help / go -h don't document flags. The -C flag is documented in go help build:

...
The build flags are shared by the build, clean, get, install, list, run,
and test commands:

	-C dir
		Change to dir before running the command.
		Any files named on the command line are interpreted after
		changing directories.
		If used, this flag must be the first one in the command line.
...