pkgs/development/python-modules/dlib/build-cores.patch

   1 diff --git a/setup.py b/setup.py
   2 index 0c8d8f16..565ef8ef 100644
   3 --- a/setup.py
   4 +++ b/setup.py
   5 @@ -172,21 +172,7 @@ class CMakeBuild(build_ext):
   6          subprocess.check_call(cmake_build, cwd=build_folder)
   7
   8  def num_available_cpu_cores(ram_per_build_process_in_gb):
   9 -    if 'TRAVIS' in os.environ and os.environ['TRAVIS']=='true':
  10 -        # When building on travis-ci, just use 2 cores since travis-ci limits
  11 -        # you to that regardless of what the hardware might suggest.
  12 -        return 2
  13 -    try:
  14 -        mem_bytes = os.sysconf('SC_PAGE_SIZE') * os.sysconf('SC_PHYS_PAGES')
  15 -        mem_gib = mem_bytes/(1024.**3)
  16 -        num_cores = multiprocessing.cpu_count()
  17 -        # make sure we have enough ram for each build process.
  18 -        mem_cores = int(floor(mem_gib/float(ram_per_build_process_in_gb)+0.5));
  19 -        # We are limited either by RAM or CPU cores.  So pick the limiting amount
  20 -        # and return that.
  21 -        return max(min(num_cores, mem_cores), 1)
  22 -    except ValueError:
  23 -        return 2 # just assume 2 if we can't get the os to tell us the right answer.
  24 +    return os.getenv("NIX_BUILD_CORES", 1)
  25
  26
  27  from setuptools.command.test import test as TestCommand