Re: Fix for _Complex_I problems

[Greg Troxel]

Looking over your patch again, I feel quite a bit better about it.

It checks for the standard first, and

  -
  +#if defined (GUILE_I)
   /* For an SCM object Z which is a complex number (ie. satisfies
      SCM_COMPLEXP), return its value as a C level "complex double". */
   #define SCM_COMPLEX_VALUE(z)                                    \
  -  (SCM_COMPLEX_REAL (z) + _Complex_I * SCM_COMPLEX_IMAG (z))
  +  (SCM_COMPLEX_REAL (z) + GUILE_I * SCM_COMPLEX_IMAG (z))
  +#endif

really is very close to a remedial define of _Complex_I.  So the impact
on conforming systems is small, and limited to a reader of the code
having to chase the GUILE_I definition.

+# When compiling with GCC on some OSs (Solaris, AIX), _Complex_I doesn't work;
+# in the reported cases so far, 1.0fi works well instead.

I would add

# This is a workaround for the failure of these systems to conform to C99.

So this all seems ok to me.