Re: Guile 1.8.2 Compile Error [GAH]

[Kevin Brott]

On Thu, 2007-11-15 at 13:59 +0100, Ludovic Courtès wrote:
> Hi,
> 
> Mike Gran <address@hidden> writes:
> 
> > You are correct. There is a value in that macro called "_Complex_I" that 
> > is, for some reason, being processed down to "__I", losing the word 
> > "Complex".
> 
> `Complex' in `_Complex_I' can't possibly be macro-expanded.  There must
> be something else.
> 
> Thanks for your help!
> 
> Ludovic.

For what it's worth:

/usr/include/complex.h:
     45 /* 
     46  * a constant expression of type const float _Complex with the
     47  * value of the imaginary unit. (a number i such that i**2 =-1).
     48  * __I is provided by the AIX xlc C99 compiler.
     49  * WARNING: DO NOT USE __I DIRECTLY in an application. Always
     50  * use _Complex_I .
     51  */
     52 #define _Complex_I      __I
     53 
     54 /*
     55  * _Imaginary_I should be a constant expression of type
     56  * const float _Imaginary with the value of the imaginary unit.
     57  * This is optional in C99.
     58  * This is not supported in the AIX xlc C99 compiler.
     59  */
     60 
     61 /* 
     62  * C99 requires this definition of the
     63  * very common variable "I", to use as a simpler way
     64  * to say _Complex_I. Mathematicians who would say
     65  * "3i" will now say in C "3 * I".
     66  */
     67 #undef I
     68 #define I _Complex_I
     69 

Could line 52 be expanded/dereferenced by cpp to make _Complex_I resolve
as __I?

-- 
#include <stddisclaimer.h>
/* Kevin Brott <address@hidden> 
 * Unix Systems Engineer - SA Group - Provtech
 * Providence Health Systems, Tigard, OR
 */


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