From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH 1/2] daemon: Fix '--version'.
Date: Thu, 01 Sep 2016 14:15:22 +0200
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In-Reply-To: <87pooo3zpk.fsf@gmail.com> (Alex Vong's message of "Thu, 01 Sep
	2016 14:23:51 +0800")
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To: Alex Vong <alexvong1995@gmail.com>
Cc: guix-devel@gnu.org

Alex Vong <alexvong1995@gmail.com> skribis:

> ludo@gnu.org (Ludovic Court=C3=A8s) writes:

[...]

>> #include <argp.h>
>>
>> const char *argp_program_version =3D "foo";
>> const char *argp_program_bug_address =3D "foo@example.org";
>>
>> static const struct argp_option options[] =3D
>>   {
>>     { "system", 's', "SYSTEM", 0,
>>       "assume SYSTEM as the current system type" },
>>     { 0, 0, 0, 0, 0 }
>>   };
>>
>> static const struct argp argp =3D
>>   {
>>     options, NULL,
>>     NULL, "doc",
>>     NULL, NULL,
>>     NULL
>>   };
>>
>> int
>> main (int argc, char *argv[])
>> {
>>   argp_parse (&argp, argc, argv, 0, 0, 0);
>>   return 0;
>> }
>
> I think you have isolated the problem! This test case does not work for
> me.
>
>
> I get the following output after building with
> (g++ -O2 -flto version.cxx):

What if you compile with =E2=80=98gcc=E2=80=99 (and rename to foo.c) instea=
d of =E2=80=98g++=E2=80=99?

It might be a symbol visibility problem, or name mangling issue.

Ludo=E2=80=99.