[Bug go/54918] New: libgo.so.0 is not runtime compatible between gcc-4.6.2 and gcc-4.7.x

["gafton at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54918

             Bug #: 54918
           Summary: libgo.so.0 is not runtime compatible between gcc-4.6.2
                    and gcc-4.7.x
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: go
        AssignedTo: ian@airs.com
        ReportedBy: gafton@gmail.com


gcc-4.6.2 shipped a libgo.so.0.0.0 runtime library.

Compiling a simple hello world binary against that libgo worked okay:

bash$ cat hello.go
package main
import "fmt"
func main() {
  fmt.Println("Hello, world")
}
bash$ gccgo -o hello hello.go
bash$ ./hello
Hello, world

When  the gcc runtime is updated on the system to gcc-4.7.2, the previouslt
compiled binary against the gcc-4.6.2 libgo.so.0 no longer works:

bash$ ./hello
./hello: symbol lookup error: ./hello: undefined symbol: libgo_os.os.Envs

Clearly the two libgo.so.0.0.0 libraries are not compatible between gcc-4.6.x
and gcc-4.7.x - as such, the soname versioning should reflect that.