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

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Package: libtool; Reported by: Michael <mhofma@HIDDEN>; dated Thu, 3 Mar 2016 10:26:02 UTC; Maintainer for libtool is bug-libtool@HIDDEN.

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Subject: Re: bug#22895: broken handling of spaces after -{L,R,l}
To: Gilles Gouaillardet <gilles.gouaillardet@HIDDEN>
References: <56D7F887.8090703@HIDDEN>
 <CAAkFZ5uym-Ww_FhMWvQPoF+JoeUrOG7LZ03t6bhdXDjD-UEHDA@HIDDEN>
From: Michael <mhofma@HIDDEN>
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Date: Fri, 4 Mar 2016 09:10:44 +0100
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Am 04.03.2016 um 07:14 schrieb Gilles Gouaillardet:
> That sounds like a duplicate of
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=21137

Yes, but only half. Your patch fixes only the missing "x"s in the tests,
but not the missing test for "-l".


Best regards,
Michael
Information forwarded to bug-libtool@HIDDEN:
bug#22895; Package libtool. Full text available.

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Subject: Re: bug#22895: broken handling of spaces after -{L,R,l}
From: Gilles Gouaillardet <gilles.gouaillardet@HIDDEN>
To: Michael <mhofma@HIDDEN>
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That sounds like a duplicate of
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=21137

Cheers,

Gilles

On Thu, Mar 3, 2016 at 5:40 PM, Michael <mhofma@HIDDEN> wrote:
> 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
>
> _______________________________________________
> Bug-libtool mailing list
> Bug-libtool@HIDDEN
> https://lists.gnu.org/mailman/listinfo/bug-libtool
>
Information forwarded to bug-libtool@HIDDEN:
bug#22895; Package libtool. Full text available.

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To: bug-libtool@HIDDEN
From: Michael <mhofma@HIDDEN>
Subject: broken handling of spaces after -{L,R,l}
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This is a multi-part message in MIME format.
--------------090702020906090402040503
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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

--------------090702020906090402040503
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diff --git a/m4/libtool.m4 b/m4/libtool.m4
index ee292af..8349119 100644
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -7557,10 +7557,11 @@ if AC_TRY_EVAL(ac_compile); then
     case $prev$p in
 
     -L* | -R* | -l*)
-       # Some compilers place space between "-{L,R}" and the path.
+       # Some compilers place space between "-{L,R,l}" and the path.
        # Remove the space.
-       if test x-L = "$p" ||
-          test x-R = "$p"; then
+       if test x-L = "x$p" ||
+          test x-R = "x$p" ||
+          test x-l = "x$p"; then
 	 prev=$p
 	 continue
        fi

--------------090702020906090402040503--
Acknowledgement sent to Michael <mhofma@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-libtool@HIDDEN. Full text available.
Report forwarded to bug-libtool@HIDDEN:
bug#22895; Package libtool. Full text available.
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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.