RE: Defining Macros With Literal Values

[Eric Lemings]

> -----Original Message-----
> From: Andreas Schwab [mailto:address@hidden 
> Sent: Wednesday, October 26, 2005 2:28 PM
> To: Eric Lemings
> Cc: 'address@hidden'; 'address@hidden'
> Subject: Re: Defining Macros With Literal Values
> 
> 
> Eric Lemings <address@hidden> writes:
> 
> > Greetings,
> >
> > I have a tricky little problem I was hoping someone could help me 
> > with.  I am trying to write an Autotools macro that 
> extracts the value 
> > of a macro from a system header file and defines another 
> preprocessor 
> > macro with the same value.
> 
> You can use AC_DEFINE_UNQUOTED to define a macro to the 
> result of a shell substitution.  You can easily extract the 
> value from the output of the preprocessor.

Well it sounds easy?  I've been trying to use AC_PREPROC_IFELSE but
it does not look like the macro captures the preprocessed output.
Or should I just use the $ac_cpp variable directly?

Eric.