[Bug go/65134] New: gccgo ignores the attribute "constructor" in a subdirectory

["e29253 at jp dot ibm.com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65134

            Bug ID: 65134
           Summary: gccgo ignores the attribute "constructor" in a
                    subdirectory
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: e29253 at jp dot ibm.com
                CC: cmang at google dot com

Created attachment 34813
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34813&action=edit
Example to reproduce the constructor problem

Gccgo ignores a C-function with the "constructor" attribute in a subdirectory.
In the attached example, gc executes a C-function init() in sub.go before a Go
function main(), but gccgo does not:

~/example$ export GOPATH=$(pwd)
~/example$ /usr/local/go/bin/go version
go version go1.4.2 linux/amd64
~/example$ /usr/local/go/bin/go run src/main/main.go
Hello from constructor
Hello from main

~/example$ export LD_LIBRARY_PATH=/usr/local/gccgo/lib64:$LD_LIBRARY_PATH
~/example$ /usr/local/gccgo/bin/go version
go version gccgo (GCC) 5.0.0 20150115 (experimental) linux/amd64
~/example$ /usr/local/gccgo/bin/go run src/main/main.go
Hello from main

~/example$

It seems this difference is due to that gccgo cannot detect a function with the
constructor attribute in an archived objects created in a subdirectory. Is
there any workaround to avoid this problem?