From: Simon Marchi <simon.marchi@efficios.com>
To: 10walls@gmail.com
Cc: cygwin@cygwin.com
Subject: Re: Cygwin libtool confused about link library
Date: Mon, 9 Mar 2020 17:01:50 -0400 [thread overview]
Message-ID: <7266f738-eddd-14b2-9908-846faa76290d@efficios.com> (raw)
In-Reply-To: <1adb66fe-fa05-225c-6996-7b9ba8f2a90b@gmail.com>
> Hello libtool folks,
> Any ideas about this? Something confused the file magic command?
> dlltool --identify does show libdl.a is associated with cygwin1.dll for
> example.
Hi,
I stumbled on this and dug into libtool, here's what I found.
As part of the process of identifying the nature these libraries, libtool uses
this nm + sed snippet [1]:
win32_nmres=`eval $NM -f posix -A \"$func_to_tool_file_result\" |
$SED -n -e '
1,100{
/ I /{
s|.*|import|
p
q
}
}'`
;;
The sed scripts looks for a line containing the " I " string.
With binutils < 2.34, the nm output looked like:
/usr/lib/libdl.a[d000000.o]: libdl_dll_iname I 0000000000000000
With binutils 2.34, the corresponding line is:
/usr/lib/libdl.a[d000000.o]: libdl_dll_iname D 0
And therefore the library is mis-identified.
The commit that introduced this regression is:
commit a288c270991de1578ad28ac312120f4167347234
Author: Alan Modra <amodra@gmail.com>
Date: Fri May 3 21:36:46 2019 +0930
PR24511, nm should not mark symbols in .init_array as "t"
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 restored the
behavior is:
commit 40bfb9762747f8336b17c70a0173d10200fa62eb
Author: Alan Modra <amodra@gmail.com>
Date: Thu Feb 27 17:28:47 2020 +1030
Re: PR24511, nm should not mark symbols in .init_array as "t"
So this should all go back to normal when there is a binutils 2.34.1 release and it is
packaged by Cygwin. In the mean time, the commit that restored the behavior could maybe
be backported in the Cygwin package, but I don't know what the habits are in Cygwin for
this kind of thing.
Simon
[1] https://github.com/autotools-mirror/libtool/blob/b9b44533fbf7c7752ffd255c3d09cc360e24183b/build-aux/ltmain.in#L3050-L3059
next prev parent reply other threads:[~2020-03-09 21:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 10:40 [ANNOUNCEMENT] Updated: binutils-2.34-1 (x86/x86_64) JonY
2020-02-29 19:23 ` Marco Atzeri
2020-03-01 2:18 ` JonY
2020-03-01 11:00 ` Marco Atzeri
2020-03-01 13:02 ` Cygwin libtool confused about link library JonY
2020-03-09 21:01 ` Simon Marchi [this message]
2020-03-09 23:19 ` JonY
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