> > main.o: In function `main': > > /Users/rwessels/tmp/log_bug/main.c:9: undefined reference to `log' > > you probably did not link the math library. try adding "-lm" when you're > linking.
Actually:
[tron@HAL9000 log]$ cat log.c
#include <msp430.h>
#include <math.h>
unsigned int foo = 10;
int main()
{
double var = log(foo);
var++;
return 0;
}
[tron@HAL9000 log]$ msp430-gcc -Os -lm -mmcu=msp430g2553 -o log log.c
/tmp/ccprYmUi.o: In function `main':
log.c:(.init9+0xc): undefined reference to `log'
collect2: ld returned 1 exit status
[tron@HAL9000 log]$ pacman -Q gcc-msp430 msp430-libc
gcc-msp430 4.6.3-3
msp430-libc 20120224-2
[tron@HAL9000 log]$ pacman -Ql msp430-libc | grep libm
[snip]
msp430-libc /usr/msp430/lib/libm.a
[snip]
[tron@HAL9000 log]$ msp430-gcc -L/usr/msp430/lib -Os -lm
-mmcu=msp430g2553 -o log log.c
/tmp/ccgcsd6H.o: In function `main':
log.c:(.init9+0xc): undefined reference to `log'
collect2: ld returned 1 exit status
Not exactly sure why, but this issue happened to me before as I was
linking a static library I wrote.
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