From: Ian Lance Taylor <iant@google.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Olaf van der Spek <olafvdspek@gmail.com>, binutils@sourceware.org
Subject: Re: Support for automatic linking via pragma
Date: Fri, 04 Mar 2011 16:52:00 -0000 [thread overview]
Message-ID: <mcrpqq625h4.fsf@google.com> (raw)
In-Reply-To: <AANLkTi=CZRDnpi5dJOyamgBHA2ckzQFEb3qyhV7gsLSA@mail.gmail.com> (H. J. Lu's message of "Fri, 4 Mar 2011 08:44:09 -0800")
"H.J. Lu" <hjl.tools@gmail.com> writes:
> On Fri, Mar 4, 2011 at 8:29 AM, Olaf van der Spek <olafvdspek@gmail.com> wrote:
>> On Mon, Feb 28, 2011 at 7:17 PM, Olaf van der Spek <olafvdspek@gmail.com> wrote:
>>> Hi,
>>>
>>> I've submitted a feature request for automatic linking via pragma:
>>> http://sourceware.org/bugzilla/show_bug.cgi?id=12485
>>> What do others think about the idea?
>>
>> Somebody?
>>
>> Let me quote the request:
>> MSVC supports the following pragma, which can be used to automatically link a
>> library when a header file is included. This is used by for example Boost.
>>
>> It makes linking with the right lib a lot simpler. No more fiddling
>> with autoconf to detect the right lib name.
>>
>
> Not necessarily. Unlike DSO, object files don't have ABI/API
> information. You may not link foo.o compiled with glibc 2.5/libbar
> 1.3 against glibc 2.13/libbar 1.9
I don't see how that is relevant to what Olaf is talking about.
What Olaf is saying is that he wants to be able to have a .h file
automatically a -l option to the link command line.
What you are saying is that if that you have a .o file, you have to link
against the -l which corresponds to the .h file which was used when the
.o file was compiled. That is of course a real problem, but it's a
problem that exists whether or not we implement the MSVC pragma.
Ian
next prev parent reply other threads:[~2011-03-04 16:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-28 18:17 Olaf van der Spek
2011-03-04 16:30 ` Olaf van der Spek
2011-03-04 16:44 ` H.J. Lu
2011-03-04 16:52 ` Ian Lance Taylor [this message]
2011-03-04 16:55 ` H.J. Lu
2011-03-04 17:31 ` Kai Tietz
2011-03-04 17:35 ` Olaf van der Spek
2011-03-04 18:40 ` Ian Lance Taylor
2011-03-04 17:31 ` Olaf van der Spek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=mcrpqq625h4.fsf@google.com \
--to=iant@google.com \
--cc=binutils@sourceware.org \
--cc=hjl.tools@gmail.com \
--cc=olafvdspek@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).