Bug regarding "-Wl" setting of libtool in autoconf context.

[Yvan FOURNIER]

Hello,

When libtool is used in conjunction
with autoconf and automake, the "wl="" values in the generated
libtool
script remain empty (instead of wl="-Wl,")
in many cases, even with compilers sur as PGI or IBM XL compilers
which require link option to be passed
through -Wl,... as they do not accept direct syntax.

Link then fails as options are passed
directly to the compiler without the -Wl,... protection,
and the compiler complains.

This is a longstanding bug, an I found
a workaround in a configure.in file from HDF5, as follows :

if test "x$GCC" != "xyes";
then
  echo 'fixing $wl in libtool'
ed - libtool <<EOF 2> /dev/null
/^wl=""/s//wl="-Wl,"/
w
q
EOF
fi

But this workaround occasionally fails
to work with libtool2 (I have had to move it closer to the end of configure.ac
to have it work most of the time, so
I suspect a race condition with other auconf actions).

I do not know if this bug has been reported
before (it is old, but still there), an am not sure if the bug is in
autoconf or in libtool, but it would
seem that setting wl="-Wl," by default and only unsetting it
for GCC or 
a compiler known not to need it would
seem sane.

Best regards,

        Yvan
Fournier


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