I am encountering errors just like reported in https://github.com/golang/go/issues/30374 on 1.12.5, where it should be fixed, but can’t comment thereI can of course comment, and now did, so this thread is obsolete - sorry for the noise.
$ go version go version go1.12.5 linux/amd64
go env Output
$ go env GOARCH="amd64" GOBIN="" GOCACHE="/home/simon/.cache/go-build" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOOS="linux" GOPATH="/media/ext4_data/Coding/go" GOPROXY="" GORACE="" GOROOT="/media/ext4_data/Linux/source/go" GOTMPDIR="" GOTOOLDIR="/media/ext4_data/Linux/source/go/pkg/tool/linux_amd64" GCCGO="gccgo" CC="gcc" CXX="g++" CGO_ENABLED="1" GOMOD="/home/simon/tmp/syncthing/go.mod" 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-build248314634=/tmp/go-build -gno-record-gcc-switches"
Running all tests with -coverpkg on all packages
git clone https://github.com/syncthing/syncthing.git
cd syncthing
go test -short -coverprofile coverage.out -coverpkg ./cmd/...,./lib/... ./cmd/... ./lib/...
results in errors like previously reported:
2019/05/15 16:02:50 duplicate symbol go.constinfo.main (types 45 and 45) in github.com/syncthing/syncthing/cmd/strelaypoolsrv and /home/simon/.cache/go-build/87/87afda35dba0b8de44e2f9d449eda7ce4caef7ed781612883b4e457eab1ee3d5-d(_go_.o)
The same also happens with just ./.... I cleaned out ~/.cache/go-build for good measure, didn’t change anything.