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Description of problem:
Compiling any program using round or roundf will show abnormal behaviour even
when including math.h. Problem is that round and roundf (and probably more) are
not declared in any of the header files. Gcc silently ignores the problem per
default, but adding -Wall, the real cause of the problem is shown. The following
small program shows the error:

#include <stdio.h>
#include <math.h>
int main(void) {
  float n,r;
  n=19.5;
  r=round(n);
  printf("%f %f\n",n,r);
  return 0;
}



Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Create any program using round/roundf and #include <math.h>
2. Compile and link with -lm
3. See output from round function call be completely messed up.
    

Actual Results:  [bme@overmind bme]$ gcc -Wall test.c -o test -lm
test.c: In function `main':
test.c:6: warning: implicit declaration of function `round'
[bme@overmind bme]$ ./test                        
19.500000 32768.000000


Expected Results:  [bme@overmind bme]$ gcc -Wall test.c -o test -lm
[bme@overmind bme]$ ./test                        
19.500000 20.000000


Additional info:

[bme@overmind bme]$ rpm -q --whatprovides /usr/include/math.h
glibc-devel-2.3.2-4.80.6
[bme@overmind bme]$ rpm -q --whatprovides /lib/libm.so.6     
glibc-2.3.2-4.80.6