[Bug fortran/21797] [4.0 only] complex(4) sqrt failures on alpha-linux

["fxcoudert at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From fxcoudert at gcc dot gnu dot org  2005-06-14 10:55 -------
Well, my latest tests on alphaev67-linux
(http://gcc.gnu.org/ml/gcc-testresults/2005-06/msg00870.html) does not show any
improvement (most failures are due to this problem). What I don't understand is
why rth doesn't have this problem (from
http://gcc.gnu.org/ml/gcc-testresults/2005-06/msg00640.html, you can see that he
didn't have this problem even before the patch was committed).

I don't have much time to look at this now, but generated code looks OK:

$ cat a.f90.t02.original 
MAIN__ ()
{
  complex4 z;
  complex4 c;

  z = __complex__ (4.0e+0, 0.0);
  c = csqrtf (z);

Even using this straight from C works OK with the system compiler:

$ cat a.c 
#include <complex.h>
#include <math.h>

int main (void) {
  complex z;
  z = 4;
  z = csqrtf(z);
  printf ("%g\n",z);
  return 0;
}
$ gcc a.c -lm && ./a.out
2

But it fails if you use the 4.1.0 compiler:

$ ./bin/gcc -static -lm a.c 
a.c: In function 'main':
a.c:8: warning: incompatible implicit declaration of built-in function 'printf'
/tmp/cce9eolp.o: In function `main':
/tmp/cce9eolp.o(.text+0x50): undefined reference to `csqrtf'
collect2: ld returned 1 exit status


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21797