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From: Harlan Stenn
Subject: AM_C*FLAGS and C*FLAGS
Date: Mon, 26 Jun 2006 04:34:18 +0000

We are told that we should not use CPPFLAGS or CFLAGS in a,
as they are for users.

The trick is that if we use a 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

- the right values end up in AM_CFLAGS and AM_CPPFLAGS
- CFLAGS and CPPFLAGS are empty in config.status


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