David Cournapeau wrote: > Robert Kern wrote: > >> David Cournapeau wrote: >> >> >>> Hi, >>> >>> This is a bit OT, but I wasted quite some time on this time, when >>> using 64 bits integers and ctypes on ubuntu edgy. As I know other people >>> use ubuntu with numpy, this may save some headache to others. I found >>> this behaviour which looks like a bug in ctypes for python2.5 on edgy >>> ubuntu: >>> >>> python2.5 -c "from ctypes import sizeof, c_longlong; print >>> sizeof(c_longlong)" >>> >>> prints 4 instead of 8, which in my case is problematic for >>> structures alignement. This affects only python2.5, and does not affect >>> a python installed from sources. Can anybody else reproduce this ? >>> >>> >> Can you try a similar program in C compiled with the same C compiler that you >> used to build ctypes? sizeof(long long) does not have to be 8 bytes; it just >> has >> to be at least as large as sizeof(long). >> >> >> > I thought that ISO C99 required long long to be at least 64 bits, and > that gcc followed this by default: > Ok, I found the problem: python 2.5 is configured with the option --with-system-ffi. If I compile python2.5 original sources with this option, I have the same problem, so it looks like a ffi-related problem. I will investigate this, because this is really annoying, but this has nothing to do with python nor numpy anymore,
cheers, David ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
