On Thu, Feb 23, 2012 at 4:42 PM, Georg-Johann Lay <a...@gjlay.de> wrote: > Paul Thomas schrieb: >> >> I'm getting very wrong math in one instance using a casting, negative >> numbers and a division. If I don't do any 1 of those three things it >> works fine. This is with an atxmega32a4 using both the atmel avr-gcc >> 4.5.1 (avr-gcc (AVR_8_bit_GNU_Toolchain_3.2.3_314) 4.5.1) as well as >> 4.5.1 gcc built with the script from AvrFreaks. The code snippet to >> demonstrate this is: ... > > > Without a minimal example that *compiles* and is legal C code no one will be > able to say anything about this. Same for guessing the compiler options. > > With almost 99.9% certainty your problem is somewhere else; not in the > arithmetic and not in the cast. > > 4.5.x has PR46779 and PR39633 open, for example, but with obfuscated code > there is no clue... > > Johann
Here's the compiler options: avr-gcc -gdwarf-2 -Wall -Wno-attributes -O2 -mmcu=atxmega32a4 -I./include -I../common/include -c -o cpv.o cpv.c avr-gcc -gdwarf-2 -Wall -Wno-attributes -O2 -mmcu=atxmega32a4 -I./include -I../common/include -c -o ../common/avrpacket.o ../common/avrpacket.c avr-gcc -gdwarf-2 -Wall -Wno-attributes -O2 -mmcu=atxmega32a4 -I./include -I../common/include -c -o ../common/crc.o ../common/crc.c avr-gcc -gdwarf-2 -Wall -Wno-attributes -O2 -mmcu=atxmega32a4 -I./include -I../common/include -Wl,-Map,cpv.map -o cpv.elf cpv.o ../common/avrpacket.o ../common/crc.o avr-objdump -h -S cpv.elf > cpv.lst I'll try and reduce this to a simple program, that can be compiled. The main thing is that uart_putchar (i.e. printf) is tied up in a custom interrupt/dma library, but I can just use a simple uart_putchar function for this. thanks, Paul _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
