overriding default compile flags when building python extensions
Dear Debian Python community,
how does one control or override the default flags used by setup.py
(setuptools module) when compiling a C extension for a python module?
The intention is to switch off -g in pygalmesh, because of memory
constraints on 32 bit systems when compiling against CGAL, see
Bug#928140, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=928140
A failed build, e.g. i386 at
https://buildd.debian.org/status/fetch.php?pkg=pygalmesh&arch=i386&ver=0.3.1-1&stamp=1556128605&raw=0
shows -g is used twice. The second usage comes from CFLAGS in
dpkg-buildflags, which I can control.
The first -g is the problem (in "-DNDEBUG -g -fwrapv -O2 -Wall"). The
advice from the internet (stackoverflow) is exceedingly poor on this
question, in most cases addressing how to add flags, not how to change
the existing default flags. Alternatives like
OPT="" python3 ./setup.py
simply do not work.
The default in question appears to be the OPT variable defined in
/usr/lib/python3.7/config-3.7m-x86_64-linux-gnu/Makefile
But how to override it?
Upstream (Nico) suggests instead to build with CC=clang++. Is this a
good alternative for Debian python modules?
Drew
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