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Re: RFA: libtool.m4

From: Ralf Wildenhues
Subject: Re: RFA: libtool.m4
Date: Fri, 1 May 2009 10:33:43 +0200
User-agent: Mutt/1.5.18 (2008-05-17)

* JonY wrote on Wed, Apr 29, 2009 at 12:53:54PM CEST:
> On 4/29/2009 15:26, Kai Tietz wrote:
>> 2009/4/28 Ralf Wildenhues<address@hidden>:
>>> * Kai Tietz wrote on Tue, Apr 28, 2009 at 02:29:12PM CEST:
>>>>>> In the libtool.m4 in function _LT_CHECK_MAGIC_METHOD the current check
>>>>>> for mingw doesn't treat the x64 proper.
>>>>>> It checks for 'file_magic file format pei*-i386(.*architecture:
>>>>>> i386)?', what is right for 32-bit mingw, but for 64-bit version this
>>>>>> string needs to be changed to something like 'file_magic file format
>>>>>> pei*(.*architecture: i386)?'
>>>> I did the libtool testsuite run for w64 target and found no serious
>>>> issues (as I expected). But the underlying issue isn't tested in the
>>>> suite at all my initial post is pointing on. The problem is that the
>>>> pattern used (and so also in libtool itself) for detection if a dll
>>>> (windows shared object) is generated is wrong.
>>> So, can you devise a short example, or ideally even a testsuite addition
>>> to git Libtool that exposes this issue?  Alternatively, describe the
>>> situation in which you encountered it.
>>>> in aclocal.m4 there is the line
>>>> 'lt_cv_deplibs_check_method='file_magic file format
>>>> pei*-i386(.*architecture: i386)?'
>>>> which doesn't fit for 64-bit dlls.
>>>> lt_cv_deplibs_check_method='file_magic file format
>>>> pei*-(i386|x86_64)(.*architecture: i386)?'

> I am confused on the following 2 functions work.
> deplibs_check_method
> func_win32_libid

The shell function tries to differentiate between static libraries on
the one hand, and import libraries and DLLs on the other.  It does so
by trying out a couple of heuristics.

The deplibs_check_method is just a hint to libtool on which method to
use in order to search for deplibs, that is, library dependencies.

> Sorry my shell scripting was never good to begin with. So here are some  
> possibly helpful info.

The information that I would like to have is the following:
Kai has reported some kind of bug.  Please tell me how you
noticed it.  What do I need to do to reproduce it (you may
assume for the moment that I had a w64 system to test with)?

I think I know what and how to fix things, but I also want to
make sure that we don't trip over a similar bug again in the
future, so I need a way to (allow you to) reproduce it (on
your system).


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