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<DIV>John,</DIV>
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<DIV>I’ve seen that error when trying to use the rubenvb versions of MinGW-w64.
As you found, it’s a bad interaction with configure trying to extract the
libraries needed to link Fortran code, from the verbose compiler output which
includes the entire GCC configure line used by rubenvb, particularly the
--with-host-libstdcxx='-static -lstdc++ -lm' part. I contacted him on
Sourceforge over a year ago asking if he could just add a space between -lm and
the apostrophe, which I believe would fix the problem, but evidently he never
made that change. Updating the autotools version used by Ipopt might also fix
the issue, but that’s easier said than done and I don’t think Stefan has had
time to finish that process.</DIV>
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<DIV>If you don’t need GCC 4.8, I recommend using TDM-GCC (<A
title=http://tdm-gcc.tdragon.net/
href="http://tdm-gcc.tdragon.net/">http://tdm-gcc.tdragon.net/</A>) instead.
It’s been the most reliable MinGW-w64 distribution that I’ve been able to find,
for the purposes of building Ipopt.</DIV>
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<DIV>-Tony</DIV>
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