William "Chops" Westfield wrote: > On Jan 26, 2012, at 2:10 PM, Georg-Johann Lay wrote: > >> I tested the code with avr-gcc 4.5 and command line options -Os -mmcu=atmega8 >> >> With the attributes, the object size is 54 bytes. >> Without the attributes the object size is 64 bytes. > > 4.5.3 ? Whatever this issue is, it apparently snuck in between 4.5.2 and > 4.5.3.
The only remarkable difference between 4.5.2 and 4.5.3 is the fix of PR42240. Depending on what distribution you use, your distributor added more patches, so we don't know. > and more substantial diffs, including the following. > "naked" deletes the prolog, but adds instructions in the body... > -.LM7: > +.LSM6: > ldi r24,lo8(5) > - rjmp .L8 > + rcall putch > + rjmp .L4 > .L3: > -.LM8: > +.LSM7: > cpi r24,lo8(-127) > brne .L5 > -.LM9: > +.LSM8: > ldi r24,lo8(4) > - rjmp .L8 > + rcall putch > + rjmp .L4 > .L5: > -.LM10: > +.LSM9: > ldi r24,lo8(3) > Some of the diff noise is because of different debug symbols/labels; Hunans see more without -g because of reduces debug info noise. The other changes look reasonable with fix PR42240. You may also want to have a look at OS_task and OS_main function attributes. If an older toolchain works better for you, maybe you are fine with the older version. Johann _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
