Re: __LDBL_MANT_DIG__

[Perry Smith <pedz at easesoftware dot net>]

Thanks Gaby...

To recap, my current quest is to resolve references to symbols like  
__floatdidf.  This is in a library for ppc64/soft-float.

Ian pointed me to ppc64-fp.c.  When I try to compile it, TFtype is  
undefined.  It is suppose to get defined in fp-bit.h but only if  
__LDBL_MANT_DIG__ is set to 113 or 106.  Right now, in the  
environment that I have now, ___LDBL_MANT_DIG__ is set to 53.  In the  
RS/6000, long doubles are 106.  (I'm not sure if "long double" is the  
right term to use here.)

I am compiling with -maix64.  It appears to me that some parts of gcc  
or libgcc assume that this implies long double but c-cppbuiltin.c  
appears to not make that assumption.

I'm not sure where or how to address this issue.

On Jan 12, 2006, at 10:05 AM, Gabriel Dos Reis wrote:

> Perry Smith <pedz@easesoftware.net> writes:
>
> | Sorry for such a lame question:
> |
> | Where does __LDBL_MANT_DIG__ get defined?  (gcc 4.0.2)
>
> a built-in macro.  See gcc/c-cppbuiltin.c
>
> -- Gaby