GNU bug report logs - #24768
uninstalled executable does not work when compiling for 32-bit Cygwin

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Package: libtool; Reported by: Bruno Haible <bruno@HIDDEN>; dated Sat, 22 Oct 2016 22:29:02 UTC; Maintainer for libtool is bug-libtool@HIDDEN.

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From: Bruno Haible <bruno@HIDDEN>
To: bug-libtool@HIDDEN
Subject: Re: uninstalled executable does not work when compiling for 32-bit
 Cygwin
Date: Sat, 19 Nov 2016 01:22:54 +0100
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A more detailed analysis of the problem submitted in
http://lists.gnu.org/archive/html/bug-libtool/2016-10/msg00000.html
has been sent to the cygwin mailing list:
https://cygwin.com/ml/cygwin/2016-11/msg00242.html

The workaround is to build *outside* the /home and /usr file hierarchies of
Cygwin. Somewhere in /cygdrive/c/Users for example.

Bruno
Information forwarded to bug-libtool@HIDDEN:
bug#24768; Package libtool. Full text available.

Message received at 24768 <at> debbugs.gnu.org:


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From: Bruno Haible <bruno@HIDDEN>
To: bug-libtool@HIDDEN
Subject: Re: uninstalled executable does not work when compiling for 32-bit
 Cygwin
Date: Sat, 19 Nov 2016 01:22:54 +0100
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A more detailed analysis of the problem submitted in
http://lists.gnu.org/archive/html/bug-libtool/2016-10/msg00000.html
has been sent to the cygwin mailing list:
https://cygwin.com/ml/cygwin/2016-11/msg00242.html

The workaround is to build *outside* the /home and /usr file hierarchies of
Cygwin. Somewhere in /cygdrive/c/Users for example.

Bruno
Information forwarded to bug-libtool@HIDDEN:
bug#24768; Package libtool. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Bruno Haible <bruno@HIDDEN>
To: bug-libtool@HIDDEN
Subject: uninstalled executable does not work when compiling for 32-bit Cygwin
Date: Sun, 23 Oct 2016 00:28:24 +0200
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Hi,

A 64-bit Cygwin environment [on Windows 10 in my case] (canonical platform
triplet: x86_64-pc-cygwin) has the following cross-compilation toolchains
(all installable through setup-x86_64.exe):

  * i686-pc-cygwin            (32-bit Cygwin)
  * i686-w64-mingw32          (32-bit mingw)
  * x86_64-w64-mingw32        (64-bit mingw)

and the executables built with the corresponding *-gcc compilers work out-of-
the-box (since they are Windows executables).

The problem
-----------

When compiling for 32-bit Cygwin a package that uses GNU libtool to
create a shared library and link with this shared library, uninstalled
executables (i.e. the executables in the build tree before "make install")
do not work. In order to make them work it is necessary to augment PATH:
add the particular .libs directory(ies) that contain the library(ies) that
the program is linked against.

I think this is a bug because
  - Other platforms do not have this problem (not even 32-bit mingw or
    64-bit mingw).
  - The .libs directory is an undocumented internal of GNU libtool.

How to reproduce
----------------

The package below is a GNU libiconv snapshot with GNU libtool 2.4.6.

$ wget http://www.haible.de/bruno/gnu/libiconv-20161022.tar.gz
$ tar xvfz libiconv-20161022.tar.gz
$ cd libiconv

$ PATH=/usr/local/cygwin32/bin:/usr/i686-pc-cygwin/sys-root/usr/bin:$PATH
$ ./configure --host=i686-pc-cygwin --prefix=/usr/local/cygwin32 \
            CC=i686-pc-cygwin-gcc \
            CXX=i686-pc-cygwin-g++ \
            CPPFLAGS="-I/usr/local/cygwin32/include -Wall" \
            LDFLAGS="-L/usr/local/cygwin32/lib"
...
$ make
...
$ src/iconv_no_i18n.exe --help
$ echo $?
127
$ PATH=lib/.libs:$PATH src/iconv_no_i18n.exe --help
Usage: iconv_no_i18n.exe ...
...
$ echo $?
0

For comparison, it works when compiling to 32-bit mingw
-------------------------------------------------------

$ PATH=/usr/local/mingw32/bin:$PATH
$ ./configure --host=i686-w64-mingw32 --prefix=/usr/local/mingw32 \
            CC=i686-w64-mingw32-gcc \
            CXX=i686-w64-mingw32-g++ \
            CPPFLAGS="-I/usr/local/mingw32/include -Wall" \
            LDFLAGS="-L/usr/local/mingw32/lib"
...
$ make
...
$ src/iconv_no_i18n.exe --help
Usage: iconv_no_i18n.exe ...
...
$ echo $?
0


Best regards,

                 Bruno
--
In memoriam Nunilo and Alodia <http://en.wikipedia.org/wiki/Nunilo_and_Alodia>
Acknowledgement sent to Bruno Haible <bruno@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-libtool@HIDDEN. Full text available.
Report forwarded to bug-libtool@HIDDEN:
bug#24768; Package libtool. Full text available.
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