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

$ go version
go version go1.15 linux/amd64

Does this issue reproduce with the latest release?

yes

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

4.15.0-117-generic #118~16.04.1-Ubuntu SMP Sat Sep 5 23:35:06 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

What did you do?

Created a golang package 'test' using following commands
go install -buildmode=shared std
go install -buildmode=shared -linkshared test

above commands will create libstd.so and libtest.so under
go/pkg/linux_amd64_dynlink folder

Created a C program to use libtest.so
int main(int argc, char **argv) {
void *handle= dlopen ("libtest.so", RTLD_LAZY);
if (!handle) {
fputs (dlerror(), stderr);
exit(1);
}
...
}

dlopen is failed with following error
libstd.so: undefined symbol: main.main

What did you expect to see?

dlopen should succeed

What did you see instead?

libstd.so: undefined symbol: main.main
This error is coming for any package. GOROOT and GOPATH are set correctly.