[Bug target/31161] __builtin_cexpi is broken on Darwin

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-03-15 09:40 -------
Yes, I'll restore 4.2.0 behavior here.  Though maybe falling back to a function
call to cexp would be more natural...

The Problem with Fortran and C++ is that they assume a C99 runtime and so they
effectively set TARGET_C99_FUNCTIONS and provide fallback implementations.  For
example libgfortran contains

#if !defined(HAVE_CEXP)
#define HAVE_CEXP 1
double complex
cexp (double complex z)
{
  double a, b;
  double complex v;

  a = REALPART (z);
  b = IMAGPART (z);
  COMPLEX_ASSIGN (v, cos (b), sin (b));
  return exp (a) * v;
}
#endif

and C++ simply relies on the target cexp() functioning correctly.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31161