C/C++ Configuration Created by configure Script
These are configuration files for various features as detected by configure
.
Include only those files you need (in order to reduce rebuilds when a setting changes).
Settings here are only C/C++ #define
directives, so they apply only to C/C++ source,
not to Makefiles.
Adding a New Setting:
- do
AC_DEFINE(HAVE_FOO)
inconfigure.ac
when a setting should be set - choose the proper
config_host/config_XXX.h
file to use- if it is a global setting (such as availability of a compiler feature),
use
config_host/config_global.h
- otherwise check if there is a matching
config_host/config_XXX.h
file - if none matches, add a new one:
- add
config_host/config_XXX.h.in
here, with just#ifndef
include guard - add
AC_CONFIG_HEADERS([config_host/config_XXX.h])
next to the others inconfigure.ac
- add
- if it is a global setting (such as availability of a compiler feature),
use
- add
#define HAVE_FOO 0
to theconfig_host/config_XXX.h
, possibly with a comment (do not use#undef HAVE_FOO
, unless the setting has more values than on/off) - add
#include <config_XXX.h>
before any #ifHAVE_FOO
in a source file - make sure you use
#if HAVE_FOO
for on/off settings, do not use#ifdef