GNU bug report logs - #21309
libtool should not use the dangerous, undocumented AC_TRY_EVAL macro, currently broken

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Vincent Lefevre <vincent <at> vinc17.net>
Subject: bug#21309: closed (Re: bug#21309: libtool generates binary data
 in config.log due to buggy escaping)
Date: Fri, 18 Oct 2024 14:53:02 +0000

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Your bug report

#21309: libtool should not use the dangerous, undocumented AC_TRY_EVAL macro, currently broken

which was filed against the libtool package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 21309 <at> debbugs.gnu.org.

-- 
21309: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=21309
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
To: 21309-done <at> debbugs.gnu.org
Cc: Vincent Lefevre <vincent <at> vinc17.net>
Subject: Re: bug#21309: libtool generates binary data in config.log due to
 buggy escaping
Date: Fri, 18 Oct 2024 17:50:35 +0300

[Message part 3 (text/plain, inline)]

Thank you (again :) for the bug report and patch!

The fix you provided has been applied to the development branch:
https://git.savannah.gnu.org/cgit/libtool.git/commit/?h=development&id=f7d11c71dbf23b6a7bc8a273782d3aa3dab08b23

-- 
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

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From: Vincent Lefevre <vincent <at> vinc17.net>
To: bug-libtool <at> gnu.org
Subject: libtool generates binary data in config.log due to buggy escaping
Date: Thu, 20 Aug 2015 03:56:02 +0200

I've reported the following bug in the Debian BTS:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=796180

but I can reproduce it with the official libtool 2.4.6.

When I run "./configure" with MPFR, the generated config.log file
contains binary data:

configure:9458: /usr/bin/nm -B conftest.o \| sed -n -e 's/^.*[ ]\([ABCDGIRSTW][ABCDGIRSTW]*\)[ ][ ]*\([_A-Za-z][_A-Za-z0-9]*\)$/^A ^B ^B/p' | sed '/ __gnu_lto/d' \> conftest.nm

where ^A and ^B are the ASCII characters of code 1 and 2 respectively.
Thus, the "file" utility thinks that this is a binary file, so that
"less" + "lesspipe" mangles the file. Rather annoying!

The generated "libtool" script contains:

global_symbol_pipe="sed -n -e 's/^.*[    ]\\([ABCDGIRSTW][ABCDGIRSTW]*\\)[       ][      ]*\\([_A-Za-z][_A-Za-z0-9]*\\)\$/\\1 \\2 \\2/p' | sed '/ __gnu_lto/d'"

So, I suppose that the binary data come from the \\1 and \\2.

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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