> -----Original Message----- > From: Weddington, Eric > Sent: Monday, November 19, 2012 8:58 AM > To: Thomas, George; avr-gcc-list@nongnu.org > Subject: RE: [avr-gcc-list] Align attribute in gcc requiring alignment of 2 > for Xmegas with USB. > > > Section 20.13.7 of the Xmega manual speaks about the requirement of 16 > bit > > alignment. > > > > http://www.atmel.com/images/doc8331.pdf > > > > As the MAXIMUM_ALIGNMENT in avr.h is set to 1, it throws an error when > > trying to compile. > > > > I have attached a patch which sets it to 2 by default in the compiler. > > I have also attached a case which fails. > > > > Would this be an acceptable change ? > > Hi George, > > No, this would not be an acceptable change, because it is changing the data > alignment for the whole compiler, when there is only a restriction on a > data structure for a single peripheral for a small subset of the AVR > processors. > > This is why the data attribute "aligned" exists. Just do this for your data > structure: > __attribute__ ((aligned (2))) >
Excuse me, perhaps I have this wrong... (It's still early for me). Does changing MAXIMUM_ALIGNMENT allow the aligned attribute to work? If we don't change MAXIMUM_ALIGNMENT, are you saying that the aligned attribute fails? If so, then YES, I would be open to a change that allows it to work... Eric _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
