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 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 <amo...@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 <amo...@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
> Thanks for investigating, I'll see about doing a new binutils release.
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