bug#68856: .la file dependency_libs dropping sole -lm dependency

[Ileana Dumitrescu]

On 31/01/2024 20:57, Bob Friesenhahn wrote:
> On Wed, 31 Jan 2024, Bob Friesenhahn wrote:
>>
>> bin/bash ./libtool  --tag=CXX --mode=link g++-10 -no-undefined
>> -export-symbols-regex ".*"  -version-info 27:4:24 -L/usr/local/lib
>> -Wl,-rpath,/usr/local/lib -o magick/libGraphicsMagick.la -rpath
>> /usr/local/lib [ list of .lo files ] -lm
>>
>> An I misunderstanding something, or is this a bug in libtool?  What am
>> I missing in order for this to work?
>
> As further information on this issue, I tried using '-lm -lm' and there
> was no change in the results:
>
>    # Libraries that this one depends upon.
>    dependency_libs=' -L/usr/local/lib'
>
>
> Then I tried using '-ljpeg -lm' and I see that the -ljpeg gets added,
> but not the -lm:
>
>    # Libraries that this one depends upon.
>    dependency_libs=' -L/usr/local/lib -ljpeg'
>
>
> and then I tried using '-lm -jpeg', and I see that there are again no
> dependency libraries at all:
>
>    # Libraries that this one depends upon.
>    dependency_libs=' -L/usr/local/lib'
>
> After testing various permutations, I see that anything starting with
> '-lm' gets removed in entirety.
>
> This same thing happens under Ubuntu 20.04 LTS and Ubuntu 22.04 LTS.
>
> Bob

Copied from libtool@gnu.org to bug-libtool@gnu.org, since this is
unintended behavior.

--
Ileana Dumitrescu

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