Re: AC_C_LONG_DOUBLE is obsolescent.

[Bob Friesenhahn]

On Wed, 9 Apr 2008, Eric Blake wrote:
> > long double is not an extension.  Did you mistake it with long long?
>
> Indeed.  A closer look at C89 requires 'long double'.  Therefore,
> AC_TYPE_LONG_DOUBLE should always succeed.

But AC_C_LONG_DOUBLE should report failure if 'long double' does not 
support a larger range than 'double' due to this documentation:

  "If the C compiler supports a working long double type with more
   range or precision than the double type, define HAVE_LONG_DOUBLE."

Based on the description, it seems that AC_TYPE_LONG_DOUBLE_WIDER is 
the new name for AC_C_LONG_DOUBLE but if it is used, then source code 
modifications are required.

Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/