From: Andrew Schulman <schulman.andrew@epa.gov>
To: cygwin@cygwin.com
Subject: Re: libargp: argp_program_version does not work
Date: Thu, 11 Jul 2013 16:35:00 -0000 [thread overview]
Message-ID: <u4ett8due4p6h9ku1iumscvulp0g688tgk@4ax.com> (raw)
In-Reply-To: <000001ce7e08$2b866830$82933890$%fedin@samsung.com>
> Hello!
>
> I have found a problem: argp_program_version string is ignored by libargp.
Hi Pavel. Thanks for reporting this. I confirm your observation. For
example, when I compile argp's example #2
(http://www.gnu.org/software/libc/manual/html_node/Argp-Example-2.html#Argp-Example-2),
the --version option doesn't work.
> I guess the problem happens because of DLL's nature. DLLs cannot contain
> unresolved symbols, so the DLL has own version of argp_program_version which
> is always initialized to NULL. There's no way to override it.
Also confirmed. argp.h declares argp_program_version as
extern const char *argp_program_version;
But gllib/argp-pv.c initializes it as
const char *argp_program_version = (const char *) 0
Whether there's a way to override that value by one declared in the user's
code, I don't know. Maybe a linker switch?
The same problem also applies to argp_program_bug_address, which is also
extern const char *.
> Is it possible to fix this somehow ? I guess it can be done if we move this
> variable to libargp.dll.a stub library. In this case, a static definition of
> this variable will be picked up from there if there's no definition in the
> program.
This is getting outside of my knowledge. A patch would be welcome.
Could someone with more C or Gnulib knowledge than me comment?
Andrew
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next prev parent reply other threads:[~2013-07-11 15:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-11 10:17 Fedin Pavel
2013-07-11 16:35 ` Andrew Schulman [this message]
2013-07-11 22:02 ` Andrew Schulman
2013-07-12 14:52 ` Fedin Pavel
2013-07-12 15:36 ` Andrew Schulman
2013-07-17 9:57 ` [PATCH] Fix optional variables in libargp Fedin Pavel
2013-07-17 12:59 ` Eric Blake
2013-07-22 7:33 ` Andrew Schulman
2013-07-22 8:12 ` Pavel Fedin
2013-07-22 13:19 ` Pavel Fedin
2013-07-23 15:07 ` Andrew Schulman
2013-07-24 9:56 ` Pavel Fedin
2022-02-18 13:30 ` Andrew Schulman
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