[Numpy-discussion] numpy ignores OPT/FOPT under Python3

[Thomas Unterthiner]

Hi!

I want to use the OPT/FOPT environment viariables to set compiler flags 
when compiling numpy. However it seems that they get ignored under 
python3. Using Ubuntu 14.04 and numpy 1.9.0, I did the following:

 >export OPT="-march=native"
 >export FOPT = "-march=native"
 > python setup.py build   # "python" executes python2.7
[...snip...]
C compiler: x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing 
-march=native -fPIC
^C

obviously under python 2.7, the additional march flag works as expected. 
However, using python3:

 >export OPT="-march=native"
 >export FOPT = "-march=native"
 >python3 setup.py build
[.... snip ...]
C compiler: x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall 
-Wstrict-prototypes -g -fstack-protector --param=ssp-buffer-size=4 
-Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC
^C


obviously, the flags aren't used in python 3.  Did I overlook something 
here? Do $OPT/$FOPT only work in Python 2.7 by design, is this a bug or 
did I miss something?

Cheers

Thomas