lynx.abraxas@xxxxxxxxxx wrote: > I'm wondering why my selfcompiled avr-gcc under Linux is not capable of binary > numbers like b00010110. In much code there is this binary syntax and it is > very annoying having to change it into hex manually. How can I give avr-gcc > this ability? This feature has existed as a patch for years but only only recently was added to FSF gcc. So you'll either need to use a recent version of gcc 4.3 (r125346 or later) or you'll need to use somebody's AVR out-of-tree patchset which contained the patch. Or I suppose you could try backporting the patch yourself. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23479 http://gcc.gnu.org/viewcvs?view=rev&revision=125346 http://gcc.gnu.org/ml/gcc-patches/2007-04/msg01458.html Brian