Subject: Re: Cygwin libtool confused about link library
To: Simon Marchi <simon DOT marchi AT efficios DOT com>
References: <1adb66fe-fa05-225c-6996-7b9ba8f2a90b AT gmail DOT com>
 <7266f738-eddd-14b2-9908-846faa76290d AT efficios DOT com>
From: JonY <10walls AT gmail DOT com>
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Message-ID: <8d616249-401b-db48-ae9a-cd77b15c63e6@gmail.com>
Date: Mon, 9 Mar 2020 23:19:47 +0000
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From: JonY <10walls AT gmail DOT com>
To: Simon Marchi <simon DOT marchi AT efficios DOT com>
Cc: cygwin AT cygwin DOT com, Libtool List <libtool AT gnu DOT org>
Message-ID: <8d616249-401b-db48-ae9a-cd77b15c63e6 AT gmail DOT com>
Subject: Re: Cygwin libtool confused about link library
References: <1adb66fe-fa05-225c-6996-7b9ba8f2a90b AT gmail DOT com>
 <7266f738-eddd-14b2-9908-846faa76290d AT efficios DOT com>
In-Reply-To: <7266f738-eddd-14b2-9908-846faa76290d AT efficios DOT com>

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On 3/9/20 9:01 PM, Simon Marchi wrote:
>> Hello libtool folks,
>> Any ideas about this? Something confused the file magic command?
>> dlltool --identify does show libdl.a is associated with cygwin1.dll fo=
r
>> example.
>=20
> Hi,
>=20
> I stumbled on this and dug into libtool, here's what I found.
>=20
> As part of the process of identifying the nature these libraries, libto=
ol uses
> this nm + sed snippet [1]:
>=20
> 	win32_nmres=3D`eval $NM -f posix -A \"$func_to_tool_file_result\" |
> 	  $SED -n -e '
> 	    1,100{
> 		/ I /{
> 		    s|.*|import|
> 		    p
> 		    q
> 		}
> 	    }'`
> 	;;
>=20
> The sed scripts looks for a line containing the " I " string.
>=20
> With binutils < 2.34, the nm output looked like:
>=20
>   /usr/lib/libdl.a[d000000.o]: libdl_dll_iname I 0000000000000000
>=20
> With binutils 2.34, the corresponding line is:
>=20
>   /usr/lib/libdl.a[d000000.o]: libdl_dll_iname D 0
>=20
> And therefore the library is mis-identified.
>=20
> The commit that introduced this regression is:
>=20
>   commit a288c270991de1578ad28ac312120f4167347234
>   Author: Alan Modra <amodra AT gmail DOT com>
>   Date:   Fri May 3 21:36:46 2019 +0930
>=20
>       PR24511, nm should not mark symbols in .init_array as "t"
>=20
> I tried building the latest commit on the binutils-2_34-branch, and the=
 behavior
> has been restored (the line shows " I " again).  The commit that restor=
ed the
> behavior is:
>=20
>   commit 40bfb9762747f8336b17c70a0173d10200fa62eb
>   Author: Alan Modra <amodra AT gmail DOT com>
>   Date:   Thu Feb 27 17:28:47 2020 +1030
>=20
>       Re: PR24511, nm should not mark symbols in .init_array as "t"
>=20
> So this should all go back to normal when there is a binutils 2.34.1 re=
lease and it is
> packaged by Cygwin.  In the mean time, the commit that restored the beh=
avior could maybe
> be backported in the Cygwin package, but I don't know what the habits a=
re in Cygwin for
> this kind of thing.
>=20
> Simon
>=20
> [1] https://github.com/autotools-mirror/libtool/blob/b9b44533fbf7c7752f=
fd255c3d09cc360e24183b/build-aux/ltmain.in#L3050-L3059
>=20

Thanks for investigating, I'll see about doing a new binutils release.


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