[Bug go/65404] New: cgo tool on powerpc-linux-gnu maybe incomplete

[Bug go/65404] New: cgo tool on powerpc-linux-gnu maybe incomplete

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

            Bug ID: 65404
           Summary: cgo tool on powerpc-linux-gnu maybe incomplete
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: doko at gcc dot gnu.org
                CC: cmang at google dot com

cgo tool on powerpc-linux-gnu maybe incomplete

the symptom noted at https://launchpad.net/bugs/1431032
shows an error:
dist/src/github.com/lxc/lxd/shared/container.go:11:2: C source files not
allowed when not using cgo: sqlite3-binding.c

another not yet implemented issue is the support for PPC relocations, reported
as
https://github.com/golang/go/issues/10118

[Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

--- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
There is nothing in the cgo tool which would cause this error.

When the command runs "go", which go tool is actually running?  The difference
may be that on platforms other than powerpc-linux-gnu it is running the go tool
from the gc compiler, but on powerpc-linux-gnu it is running the go tool from
the gccgo compiler.  This could potentially happen because the gc compiler does
not support 32-bit powerpc.

[Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

--- Comment #2 from Matthias Klose <doko at gcc dot gnu.org> ---
see http://paste.ubuntu.com/10586128/

afaics it is both running the go tool from GCC 5. no other go tool is
installed.

[Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete

[stgraber at stgraber dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

Stéphane Graber <stgraber at stgraber dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |stgraber at stgraber dot org

--- Comment #3 from Stéphane Graber <stgraber at stgraber dot org> ---
Hi,

Correct, on both my powerpc and ppc64le systems, I'm running:

(vivid-ppc64el)stgraber@kelsey01:~$ go version
go version go1.4.2 gccgo (Ubuntu 5-20150309-1ubuntu1) 5.0.0 20150310
(experimental) [trunk revision 221296] linux/ppc64le

(vivid-powerpc-sbuild)root@winton-06:~# go version
go version go1.4.2 gccgo (Ubuntu 5-20150309-1ubuntu1) 5.0.0 20150310
(experimental) [trunk revision 221296] linux/ppc


The ppc64le one works fine, the powerpc one fails.
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Subject: [Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide404

--- Comment #4 from Ian Lance Taylor <ian at airs dot com> ---
OK, found it.  Thanks.  Will send patch shortly.

[Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete

[ian at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

--- Comment #5 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Thu Mar 12 16:41:28 2015
New Revision: 221396

URL: https://gcc.gnu.org/viewcvs?rev=221396&root=gcc&view=rev
Log:
    PR go/65404
go/build: cgo works on linux/pcc.

Modified:
    trunk/libgo/go/go/build/build.go

[Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

Ian Lance Taylor <ian at airs dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Ian Lance Taylor <ian at airs dot com> ---
This one should be fixed.

[Bug go/65404] cgo tool on powerpc-linux-gnu maybe incomplete

[stgraber at stgraber dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

--- Comment #7 from Stéphane Graber <stgraber at stgraber dot org> ---
So with the cherry-picked fix, I get:

(vivid-powerpc-sbuild)root@winton-06:~# cat test.go
package main

/*
#include <stdio.h>
now
void hello() {
        printf("Hello world!\n");
}
*/
import "C"

func main() {
    C.hello()
}

(vivid-powerpc-sbuild)root@winton-06:~# go build -v -x test.go
WORK=/tmp/go-build320378268
command-line-arguments
mkdir -p $WORK/command-line-arguments/_obj/
cd /root
CGO_LDFLAGS="-g" "-O2" /usr/lib/gcc/powerpc-linux-gnu/5/cgo -objdir
$WORK/command-line-arguments/_obj/ -gccgo -- -I
$WORK/command-line-arguments/_obj/ test.go
# command-line-arguments
./test.go:13:5: call of non-function C.hello


So cgo is now supported and I don't have to force it with CGO_ENABLED=1 but I
still can't use my cgo function.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65404

--- Comment #8 from Stéphane Graber <stgraber at stgraber dot org> ---
Mathias suggested this may be #65417 but I'm not familiar enough with gccgo and
cgo to know whether that's the case or not.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide404

--- Comment #9 from Ian Lance Taylor <ian at airs dot com> ---
It could be due to PR 65417, yes.