We are told that we should not use CPPFLAGS or CFLAGS in a Makefile.am, as they are for users.
The trick is that if we use a configure.ac file to help decide what flags may be needed, >inside< this configure script we need to use CFLAGS and CPPFLAGS to effect the running of configure. (I say CFLAGS adn CPPFLAGS, but I have a possibly incorrect memory that for configure tests, they all need to be in CFLAGS.) Assuming this is true (ie, I am not mistaken), how can one make these "choices" in a configure script and then "decompose" these choices so that: - the right values end up in AM_CFLAGS and AM_CPPFLAGS - CFLAGS and CPPFLAGS are empty in config.status H
