os/user: fails to compile with 'osusergo' tag on linux/amd64

[sbinet]

What version of Go are you using (go version)?

$> go version
go version devel +eb4f33243e Fri Apr 13 03:15:02 2018 +0000 linux/amd64

Does this issue reproduce with the latest release?

no. osusergo is for next release.

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

$> go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/binet/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/binet/dev/go/gocode"
GORACE=""
GOROOT="/home/binet/sdk/go"
GOTMPDIR=""
GOTOOLDIR="/home/binet/sdk/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build320271274=/tmp/go-build -gno-record-gcc-switches"

What did you do?

$> cd ./src/os/user
$> go build -tags osusergo
# os/user
./getgrouplist_unix.go:32: undefined: maxGroups
./getgrouplist_unix.go:33: undefined: maxGroups

What did you expect to see?

A completely static, no-libc, os/user package being successfully built.

What did you see instead?

couldn't see anything through my tears. but I have a CL coming up.

[gopherbot]

Change https://golang.org/cl/106837 mentions this issue: os/user: add missing osusergo build tag guard

[tklauser]

/cc @kolyshkin @bradfitz @ianlancetaylor

[kolyshkin]

@sbinet thanks for the catch (and the fix) 🤝

[gopherbot]

Change https://golang.org/cl/107299 mentions this issue: os/user: fix build on darwin with "osusergo" build tag

[gopherbot]

Change https://golang.org/cl/107300 mentions this issue: cmd/dist, os/user: test os/user in osusergo mode as well, fix plan9 & windows

[gopherbot]

Change https://golang.org/cl/107304 mentions this issue: os/user: fix osusergo build on Solaris