On Wed, Apr 13, 2011 at 10:57 PM, Patrick Rutkowski <rutski89@xxxxxxxxx> wrote: > Hmm, very interesting. Is it possible to determine what the > memory alignment requirements are on a given implementation? (I think: "... on a given architecture.") Looking for portable ways, google found http://coding.derkeiler.com/Archive/C_CPP/comp.lang.c/2007-03/msg04634.html don't know whether it is good or even correct. > Or do you really have to go and manually look at the > documentation for every system+arch you're releasing on, and > manually keep track of alignment requirements? Usually you should not need to keep track of alignment requirments, I think. The code I meet often lost alignment issues as soon as it was improved and written cleaner, which also for me often solved byte order issues. > I wrote a little test case which allocates a few dozen memory > blocks with malloc() and then examines them to guess what the > system's alignment seems to be, but obviously I don't want to > use that as a final solution. If you just need some "selector", what with something like struct test_s { char c; long i;}; and checking if sizeof(struct test_s) is 8 (4 byte aligned) or 16 (8 byte aligned) or so? oki, Steffen
