<p>As detailed here:<br>
<a href="http://arma.sourceforge.net/docs.html#uword">http://arma.sourceforge.net/docs.html#uword</a></p>
<p>Armadillo uses 64 bit word length by default when using a c++11 capable compiler. When used with mlpack this leads to errors such as</p>
<pre><code>error: arma::memory::acquire(): out of memory
terminate called after throwing an instance of 'std::bad_alloc'
what(): std::bad_alloc
</code></pre>
<p>I've tried uncommenting the relevant line in include/armadillo_bits/config.hpp, and using -DARMA_64BIT_WORD when running cmake with mlpack. However when I link this version of mlpack my application immediately segfaults:</p>
<pre><code>Program received signal SIGSEGV, Segmentation fault.
0x00007ffff791f905 in long double boost::math::lanczos::lanczos17m64::lanczos_sum_expG_scaled<long double>(long double const&) ()
from /nfs/users/nfs_j/jl11/installations/pangwas/mlpack/build_64/lib/libmlpack.so.1
(gdb) bt
#0 0x00007ffff791f905 in long double boost::math::lanczos::lanczos17m64::lanczos_sum_expG_scaled<long double>(long double const&) ()
from /nfs/users/nfs_j/jl11/installations/pangwas/mlpack/build_64/lib/libmlpack.so.1
#1 0x00007ffff791133f in _GLOBAL__sub_I_discrete_distribution.cpp () from /nfs/users/nfs_j/jl11/installations/pangwas/mlpack/build_64/lib/libmlpack.so.1
#2 0x00007ffff7de9306 in ?? () from /lib64/ld-linux-x86-64.so.2
</code></pre>
<p>Could you provide advice on how to compile and link mlpack correctly when using the newer versions of Armadillo?</p>
<p>Thanks!</p>
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