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Re: OT: gcc warning: implicit declaration of function


Bryce Schober wrote:
[shell]
$ arm-elf-gcc -g -c -Wall -o obj/test.o test.c
test.c: In function `main':
test.c:6: warning: implicit declaration of function `abs'
[/shell]

[test.c]
#include <stdlib.h>

int main(int argc, char *argv[])
{
    int a = abs(-3);

    return a;
}
[/test.c]


Try adding -E and see what the preprocessed source looks like.
I'd guess you're using newlib, and there's something funky
with newlib's headers.  I never have used newlib, so I wouldn't know.
What version of gcc and newlib are you using?
- Dan


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