compiling newlib

[Paul Zimmermann]

thank you Jeff for your answer.

In return I found I believe an issue with newlib's tgammaf function, for
input -0, where it gives +inf instead of -inf:

$ cat e.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#ifdef NEWLIB
/* without this, newlib says: undefined reference to `__errno' */
int errno;
int* __errno () { return &errno; }
#endif

int
main (int argc, char *argv[])
{
  float x = -0.0;
  float y = tgammaf (x);
  printf ("x=%.9e y=%.9e\n", x, y);
  return 0;
}

With glibc :

$ gcc e.c -lm
$ ./a.out 
x=-0.000000000e+00 y=-inf

With NEWLIB :

$ gcc -DNEWLIB e.c /localdisk/zimmerma/newlib/libm/libm.a
$ ./a.out 
x=-0.000000000e+00 y=inf

Best regards,
Paul