Go version

go version go1.22.1 freebsd/amd64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/ov/.cache/go-build'
GOENV='/home/ov/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='freebsd'
GOINSECURE=''
GOMODCACHE='/home/ov/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='freebsd'
GOPATH='/home/ov/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go122'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go122/pkg/tool/freebsd_amd64'
GOVCS=''
GOVERSION='go1.22.1'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='cc'
CXX='clang++'
CGO_ENABLED='1'
GOMOD='/home/ov/...../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 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2801792256=/tmp/go-build -gno-record-gcc-switches'

What did you do?

I'm trying to cross-compile a project for Linux on a FreeBSD host:

GOOS=linux GOARCH=amd64 CGO_ENABLED=1 CC="gcc13" CXX="g++13" go build -ldflags "-extldflags -static" -o app

I tried different CC/CXX options (clang, gcc, amd64-gcc) - they all behave the same.

What did you see happen?

Here's what I get:

GOOS=linux GOARCH=amd64 CGO_ENABLED=1 CC="gcc13" CXX="g++13" go build -ldflags "-extldflags -static" -o app
# net
/usr/local/go122/src/net/cgo_resnew.go:20:76: cannot use _Ctype_socklen_t(len(b)) (value of type _Ctype_uint) as _Ctype_ulong value in argument to (_C2func_getnameinfo)

There was a similar discussion about this in #33101 and the solution was to set CGO_ENABLED=0. The problem is that my project has some c++ code that needs to be built, so I can't disable cgo.

If I manually modify the flags in cgo_resnew.go and cgo_resold.go so the latter is used for Linux, the compiling progresses, but it then fails on linking with:

/usr/local/go122/pkg/tool/freebsd_amd64/link: running g++13 failed: exit status 1
/usr/local/bin/ld: cannot find -lresolv: No such file or directory
collect2: error: ld returned 1 exit status

I am not sure if modifying the resnew/old was the right thing, so decided to not dig any deeper and create the report instead.

What did you expect to see?

I expect to be able to do cross-compile builds that use the net module with CGO_ENABLED=1. I can do this on Mac with musl, I can do normal builds on FreeBSD. I expect the cross-builds work on FreeBSD, as well.

Thank you.