Differences
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| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
| avr:usage [2013/09/18 14:52] – sdolt | avr:usage [2014/07/07 16:09] – [Liens utiles] sbolay |
|---|
| |Calculateur de fusible|[[http://www.engbedded.com/fusecalc/]]| | |Calculateur de fusible|[[http://www.engbedded.com/fusecalc/]]| |
| |Comprendre les registres d'entrée/sortie|[[http://iamsuhasm.wordpress.com/tutsproj/avr-gcc-tutorial/]]| | |Comprendre les registres d'entrée/sortie|[[http://iamsuhasm.wordpress.com/tutsproj/avr-gcc-tutorial/]]| |
| | |
| | |
| | ===== FAQ ===== |
| | see error "multiple definition of `_floatsisf'" |
| | look especially to the position of the **-lm** flag |
| | |
| | <code bash> |
| | $ avr-gcc -mmcu=attiny85 -o main.elf main.c |
| | /usr/local/CrossPack-AVR-20130212/lib/gcc/avr/4.6.2/../../../../avr/lib/avr25/libc.a(floatsisf.o):../../../libm/fplib/floatsisf.S:46: multiple definition of `__floatsisf' |
| | /usr/local/CrossPack-AVR-20130212/lib/gcc/avr/4.6.2/avr25/libgcc.a(_si_to_sf.o):/Users/cs/Developer/Repos/Microcontroller/CrossPack-AVR/compile/avr-gcc-4.6.2/build-objects/avr/avr25/libgcc/../../.././gcc/fp-bit.c:1336: first defined here |
| | collect2: ld returned 1 exit status |
| | |
| | $ avr-gcc -mmcu=attiny85 -lm -o main.elf main.c |
| | /usr/local/CrossPack-AVR-20130212/lib/gcc/avr/4.6.2/../../../../avr/lib/avr25/libc.a(floatsisf.o):../../../libm/fplib/floatsisf.S:46: multiple definition of `__floatsisf' |
| | /usr/local/CrossPack-AVR-20130212/lib/gcc/avr/4.6.2/avr25/libgcc.a(_si_to_sf.o):/Users/cs/Developer/Repos/Microcontroller/CrossPack-AVR/compile/avr-gcc-4.6.2/build-objects/avr/avr25/libgcc/../../.././gcc/fp-bit.c:1336: first defined here |
| | collect2: ld returned 1 exit status |
| | |
| | $ avr-gcc -mmcu=attiny85 -o main.elf main.c -lm |
| | $ |
| | </code> |
