On 09.06.2014 01:54, Sturla Molden wrote:

Why does 64-bit MinGW require -O0 and -DDEBUG?

https://github.com/numpy/numpy/blob/master/numpy/distutils/mingw32ccompiler....

Is this a bug or intentional?

probably a temporary commit that was never removed, it originates from 2008:

commit 55446eef45da7a66ee300e68cd99411467efdb9c Author: David Cournapeau cournape@gmail.com Date: Sat Dec 20 17:31:48 2008 +0000

Remove optimization flags for now, to speed up builds. --- numpy/distutils/mingw32ccompiler.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)