failures during the build of python-host can show up a later in cryptic ways

[GoogleCodeExporter]

We currently build a host version of python in order to build the NaCl version. 
  We build this with -m32 flags so that it matches the bittage of NaCl.  Often 
the host machine doesn't have all the required 32-bit dev packages and so key 
native modules (zlib, binascii, ssl, md5) etc can fail to build.

However, when these modules fail it doesn't cause the python-host build to fail 
(its merry completes with lots of modules missing).

Ideally failure to build any of the core modules would result in a failure of 
the python-host build.

Original issue reported on code.google.com by sbc@google.com on 30 Jan 2015 at 10:17

[GoogleCodeExporter]

Better still, we could try to eliminate the python-host build completely and 
use sel_ldr to run the NaCl python during the build.

Original comment by sbc@google.com on 30 Jan 2015 at 10:19