Re: config headers and #undefs

[Akim Demaille]

Kevin Ryde <address@hidden> writes:

> I'm using AM_CONFIG_HEADER to insert a couple of configure-time
> defines into headers which will be installed.  This works well, except
> that I want to have one literal #undef pass through, rather than be
> commented out like normally happens.
> 
> Perhaps a special marker could stop selected #undef's from getting
> transformed, for instance,
> 
>         #define __need_size_t
>         #include <stddef.h>
>         #undef __need_size_t /*NOTATEMPLATE*/

This is typically what should happen in config.h.  config.h is
strictly equivalent to a series of -D flags passed to the compiler.
Anything else, such as including a header, belongs to system.h.

Really, unless I misunderstood something, you are getting out of the
Autoconf model.