mlpack mipsel build runs out of space at only 500Mb RAM

Dear MIPS People,

Please see the mipsel build log for mlpack 4.0.0-1,

https://buildd.debian.org/status/fetch.php?pkg=mlpack&arch=mipsel&ver=4.0.0-1&stamp=1667929620&raw=0

The bottom line is:

as: out of memory allocating 4072 bytes after a total of 542392320 bytes
make[3]: *** [src/mlpack/methods/CMakeFiles/mlpack_cf.dir/build.make:79:
src/mlpack/methods/CMakeFiles/mlpack_cf.dir/cf/cf_main.cpp.o] Error 1

The build succeeds on all the other "supported" architectures.

I'll grant you mlpack is a beast to build. "C++ Templates Considered Harmful".

But even so, half a gig RAM does seem a little tight, even if it's
just for the assembler.

I checked, and the involved build has 16GB RAM, with a per-process
limit of 2GB due to architectural restrictions.

Any advice? It's already restricted to a non-parallel build, to try to
lower the footprint. I'm loath to just disable the build on some
architectures, but will if you folks think that's a good idea.

Cheers,

--Barak.