gollvm: can't find some C std pthread_xxx functions #45424
Description
What version of Go are you using (go version)?
$ go version go version go1.16 gollvm LLVM 13.0.0git linux/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GO111MODULE="off" GOARCH="amd64" GOBIN="/home/jxzhang/workspace/gowork/bin" GOCACHE="/home/jxzhang/.cache/go-build" GOENV="/home/jxzhang/.config/go/env" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOINSECURE="" GOMODCACHE="/home/jxzhang/workspace/gowork/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="linux" GOPATH="/home/jxzhang/workspace/gowork" GOPRIVATE="" GOPROXY="https://goproxy.cn,direct" GOROOT="/home/jxzhang/.local/go" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/home/jxzhang/.local/gollvm/tools" GOVCS="" GOVERSION="go1.16 gollvm LLVM 13.0.0git" GCCGO="/home/jxzhang/.local/gollvm/bin/llvm-goc" AR="ar" CC="/home/jxzhang/workspace/llvm_area/llvm-project/build/bin/clang" CXX="/home/jxzhang/workspace/llvm_area/llvm-project/build/bin/clang++" CGO_ENABLED="1" GOMOD="" 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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build4207555597=/tmp/go-build -gno-record-gcc-switches -funwind-tables"
What did you do?
I wrote a cgo demo which call pthread std functions and tried to compile it with gollvm
Here is a link on play.golang- https://play.golang.org/p/PiaY0AIGprl
Though the code can't run on play.golang for some reason...
What did you expect to see?
Compile succeed with gollvm
What did you see instead?
An error caused by an undefined reference occured
ccode.c:11: error: undefined reference to 'pthread_join'
In addition to this function, there are some other functions that also have this error:
pthread_once, pthread_mutexattr_init, pthread_mutexattr_settype, pthread_key_create, pthread_getspecific, pthread_mutexattr_destroy ...
Some extra observations
These functions above seems different between pthread_create which can be referenced normally
jx $ nm /home/jx/.local/gollvm/lib64/libgo.so.13git | grep pthread_create
00000000010831e0 t __wrap_pthread_create
w pthread_create
jx $ nm /home/jx/.local/gollvm/lib64/libgo.so.13git | grep pthread_join
jx $ nm /home/jx/.local/gollvm/lib64/libgo.so.13git | grep pthread_once
w pthread_once