Dale Mellor <dale@xxxxxxxxxxxxxxxxxxxx> writes:
> I recieved about half a dozen responses to this and the overriding
> message is: config.h is worse than useless for packages which install
> libraries and public header files, so don't use it (bottom line is, the
> library developer has no control over the environment in which a library
> gets linked, and the environment that was in effect when the library was
> built is largely irrelevant). The situation might change in future, but
> it is unlikely. You'll just have to work out your own solutions to
> problems of conveying useful autoconf data to eventual application
> programs.
I've posted this on several occasions. This strategy works great for me.
#! /bin/sh
## $Id: mksystem,v 1.8 2004/01/12 06:09:27 rra Exp $
##
## Create include/inn/system.h from include/config.h.
##
## include/config.h is generated by autoconf and contains all of the test
## results for a platform. Most of these are only used when building INN,
## but some of them are needed for various definitions in the header files
## for INN's libraries. We want to be able to install those header files
## and their prerequisites, but we don't want to define the normal symbols
## defined by autoconf since they're too likely to conflict with other
## packages.
##
## This script takes the path to awk as its first argument and the path to
## include/config.h as its second argument and generates a file suitable
## for being included as <inn/system.h>. It contains only the autoconf
## results needed for INN's API, and the symbols that might conflict with
## autoconf results in other packages have INN_ prepended.
cat <<EOF
/* Automatically generated by mksystem from config.h; do not edit. */
/* This header contains information obtained by INN at configure time that
is needed by INN headers. Autoconf results that may conflict with the
autoconf results of another package have INN_ prepended to the
preprocessor symbols. */
#ifndef INN_SYSTEM_H
#define INN_SYSTEM_H 1
EOF
$1 '
/^#define HAVE_C99_VAMACROS/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE_GNU_VAMACROS/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE_INET6/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE_INTTYPES_H/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE_MSYNC_3_ARG/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE_STDBOOL_H/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE_SYS_BITTYPES_H/ { print $1 " INN_" $2 " " $3 }
/^#define HAVE__BOOL/ { print $1 " INN_" $2 " " $3 }
' $2
cat <<EOF
#endif /* INN_SYSTEM_H */
EOF
--
Russ Allbery (rra@xxxxxxxxxxxx) <http://www.eyrie.org/~eagle/>
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