GNU bug report logs - #22895
broken handling of spaces after -{L,R,l}

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Michael <mhofma <at> googlemail.com>
Subject: bug#22895: closed (Re: bug#22895: broken handling of spaces after
 -{L,R,l})
Date: Mon, 21 Oct 2024 17:59:03 +0000

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Your bug report

#22895: broken handling of spaces after -{L,R,l}

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 22895 <at> debbugs.gnu.org.

-- 
22895: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22895
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
To: 22895-done <at> debbugs.gnu.org
Cc: Michael <mhofma <at> googlemail.com>
Subject: Re: bug#22895: broken handling of spaces after -{L,R,l}
Date: Mon, 21 Oct 2024 20:56:22 +0300

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Thank you for your bug report and patch. It was addressed in this bug
report [1], and it was patched in this commit [2].

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=60731
[2] 
https://git.savannah.gnu.org/cgit/libtool.git/commit/?id=fb617e2ba0809218486323823b74f706cedd9aac

-- 
Ileana Dumitrescu

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

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From: Michael <mhofma <at> googlemail.com>
To: bug-libtool <at> gnu.org
Subject: broken handling of spaces after -{L,R,l}
Date: Thu, 3 Mar 2016 09:40:39 +0100

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Hi,

in m4/libtool.m4, the handling of spaces after -{L,R,l} for parsing
linker commands looks as follows:

  case $prev$p in
    -L* | -R* | -l*)
      # Some compilers place space between "-{L,R}" and the path.
      # Remove the space.
      if test x-L = "$p" ||
         test x-R = "$p"; then
         prev=$p
         continue
      fi

This seems to be broken for two reasons:
1. The case handling captures -l, but the following tests consider only
-L and -R.
2. The tests for equality use an x on the left side, but not on the
right side.

A working code should look as follows (patch is attached):

  case $prev$p in
    -L* | -R* | -l*)
      # Some compilers place space between "-{L,R,l}" and the path.
      # Remove the space.
      if test x-L = "x$p" ||
         test x-R = "x$p" ||
         test x-l = "x$p"; then
         prev=$p
         continue
      fi

I stumbled across this bug when using gfortran (5.3.1) which emits the
following (valid) line:

  Driving: gfortran -v conftest.o -l gfortran -l m -shared-libgcc

The current (broken) libtool leads to "-l -l" in the "postdeps_FC"
variable. After the fix, the correct "-lgfortran -lm" appears.


Best regards,
Michael

[libtool_fix_space_handling.patch (text/x-patch, attachment)]

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