First, isn't compilation is limited by the amount of virtual memory?

Turning the question around, what is the point of buildd arbitrarily
imposing a 4GB virtual memory limit (if it is indeed hardcoded)? If it
isn't hardcoded, trying to fix scrambled spaghetti compiler code is
sadly not a very practical suggestion. The issue according to the
maintainer is really about why servers running the buildd service fail
because of a 4GB out-of-memory error on the server. The 4GB limit means
he can't build the shogun-octave package on the buildd server, so he
cannot create the package for the distro. It can, however, be built with
8GB virtual memory. That's really not much memory for a complex
scientific application compilation. Servers typically have much more
physical (and virtual) memory than that; the average server sold last
year had 18GB physical memory.

Could the 4GB limit be increased to 8GB?

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https://bugs.launchpad.net/bugs/1090819

Title:
  libshogun-dev upgrade impossible - shogun-octave missing due to 4GB
  out-of-memory compilation error

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