Re: [Bug-gsl] Dear Teacher, I have a problem with GSL, if you have free time, please help me!

[Frank Reininghaus]

Hi,

in general, it's very difficult to tell what the problem is if you do
not provide compilable source code.

The errors you are getting look unrelated to GSL:

Am 17. Januar 2012 11:46 schrieb Fu Changhong
>>gcc -O3 -I../include `pkg-config --cflags opencv` `pkg-config --cflags gsl` 
>>-c particles.c -o particles.o
>>particles.c: In function ‘resample’:
>>particles.c:157:3: warning: passing argument 4 of ‘qsort’ from incompatible 
>>pointer type [enabled by default]
>>/usr/include/stdlib.h:761:13: note: expected ‘__compar_fn_t’ but argument is 
>>of type ‘int (*)(void *, void *)’

Check your use of the 'qsort' function in that line.

>>gcc
>  -O3 -I../include `pkg-config --cflags opencv` `pkg-config --cflags gsl`
>  `pkg-config --libs opencv` `pkg-config --libs gsl` ../src/observation.o
>  ../src/utils.o ../src/observe.c -o observe
>>/tmp/cctSW8s8.o: In function `arg_parse':
>>observe.c:(.text+0x160): undefined reference to `cvLoadImage'
>>observe.c:(.text+0x1d4): undefined reference to `cvLoadImage'

The cannnot find the library which contains the cv* symbols.

>>observation.c:(.text+0x500): undefined reference to `sqrt'

>>observation.c:(.text+0x92f): undefined reference to `exp'
>>observation.c:(.text+0x956): undefined reference to `sqrt'

You can probably fix these errors by adding '-lm' to the arguments
passed to the linker.

Note that this mailing list is actually for bugs reports concerning GSL.

Best regards,
Frank