runtime/cgo: linux_syscall.c:67:13: error: implicit declaration of function 'setresgid' is invalid in C99 [-Werror,-Wimplicit-function-declaration]

[kmlebedev]

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

go version go1.19 darwin/amd64

Does this issue reproduce with the latest release?

yes

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

go env Output

```
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/tochka/Library/Caches/go-build"
GOENV="/Users/tochka/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/tochka/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/tochka/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.19"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/tochka/GolandProjects/seaweedfs/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/zv/tqq_jjhx3sb04kjw8565qmf00000gn/T/go-build1384732046=/tmp/go-build -gno-record-gcc-switches -fno-common"
```

What did you do?

1. git clone https://github.com/seaweedfs/seaweedfs.git
2. cd ../weed; CGO_ENABLED=1 GOOS=linux go build -race -tags "" -ldflags "-extldflags -static "

What did you expect to see?

make dev
export SWCOMMIT=fa2ccd8e
export SWLDFLAGS="-X github.com/seaweedfs/seaweedfs/weed/util.COMMIT="
cd ../weed; CGO_ENABLED=0 GOOS=linux go build  -tags "" -ldflags "-extldflags -static "; mv weed ../docker/
docker build --no-cache -t chrislusf/seaweedfs:local -f Dockerfile.local .

What did you see instead?

make dev_race
export SWCOMMIT=fa2ccd8e
export SWLDFLAGS="-X github.com/seaweedfs/seaweedfs/weed/util.COMMIT="
cd ../weed; CGO_ENABLED=1 GOOS=linux go build -race -tags "" -ldflags "-extldflags -static "; mv weed ../docker/
# runtime/cgo
linux_syscall.c:67:13: error: implicit declaration of function 'setresgid' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
linux_syscall.c:67:13: note: did you mean 'setregid'?
/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/unistd.h:593:6: note: 'setregid' declared here
linux_syscall.c:73:13: error: implicit declaration of function 'setresuid' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
linux_syscall.c:73:13: note: did you mean 'setreuid'?
/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/unistd.h:595:6: note: 'setreuid' declared here

[ianlancetaylor]

You are cross-compiling from Darwin to Linux with CGO_ENABLED=1. That requires setting CC to a cross-compiler that generates Linux objects using Linux header files. You aren't doing that.

[kmlebedev]

@ianlancetaylor I tried setting https://words.filippo.io/easy-windows-and-linux-cross-compilers-for-macos/

1. CC="x86_64-linux-musl-gcc" CXX="x86_64-linux-musl-g++" :

cd ../weed; CGO_ENABLED=1 CC="x86_64-linux-musl-gcc" CXX="x86_64-linux-musl-g++" GOOS=linux go build -race -tags "" -ldflags "-extldflags -static "; mv weed ../docker/
# github.com/seaweedfs/seaweedfs/weed
runtime.mallocgc: relocation target __tsan_malloc not defined
runtime.runfinq: relocation target __tsan_finalizer_goroutine not defined
runtime.(*sweepLocked).sweep: relocation target __tsan_free not defined
runtime.goexit1: relocation target __tsan_go_end not defined
runtime.gfget: relocation target __tsan_malloc not defined
runtime.(*p).init: relocation target __tsan_proc_create not defined
runtime.(*p).destroy: relocation target __tsan_go_end not defined
runtime.(*p).destroy: relocation target __tsan_proc_destroy not defined
runtime.RaceDisable: relocation target __tsan_go_ignore_sync_begin not defined
runtime.RaceEnable: relocation target __tsan_go_ignore_sync_end not defined
runtime.raceinit: relocation target __tsan_init not defined
runtime.raceinit: relocation target __tsan_map_shadow not defined
runtime.racefini: relocation target __tsan_fini not defined
runtime.racemapshadow: relocation target __tsan_map_shadow not defined
runtime.racegostart: relocation target __tsan_go_start not defined
runtime.raceacquireg: relocation target __tsan_acquire not defined
runtime.raceacquirectx: relocation target __tsan_acquire not defined
runtime.racereleaseg: relocation target __tsan_release not defined
runtime.racereleaseacquireg: relocation target __tsan_release_acquire not defined
runtime.racereleasemergeg: relocation target __tsan_release_merge not defined
runtime.stackalloc: relocation target __tsan_malloc not defined
/usr/local/go/pkg/tool/darwin_amd64/link: too many errors

and
2. CC="x86_64-linux-musl-gcc" CXX="x86_64-linux-musl-g++" :

cd ../weed; CGO_ENABLED=1 CC="x86_64-w64-mingw32-gcc" CXX="x86_64-w64-mingw32-g++" GOOS=linux go build -race -tags "" -ldflags "-extldflags -static "; mv weed ../docker/
# runtime/cgo
gcc_linux_amd64.c: In function '_cgo_sys_thread_start':
gcc_linux_amd64.c:63:9: error: unknown type name 'sigset_t'; did you mean '_sigset_t'?
   63 |         sigset_t ign, oset;
      |         ^~~~~~~~
      |         _sigset_t
gcc_linux_amd64.c:68:9: error: implicit declaration of function 'sigfillset' [-Werror=implicit-function-declaration]
   68 |         sigfillset(&ign);
      |         ^~~~~~~~~~
gcc_linux_amd64.c:63:23: error: unused variable 'oset' [-Werror=unused-variable]
   63 |         sigset_t ign, oset;
      |                       ^~~~
cc1: all warnings being treated as errors

As it turned out, this is not a completely trivial task, maybe there is an up-to-date instruction?

[kmlebedev]

It seems that this has not yet been resolved.
#42382
@dr2chase Please reopen the issue

[seankhliao]

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For questions please refer to https://github.com/golang/go/wiki/Questions