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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) in configure.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 in configure.ac
add #define HAVE_FOO 0 to the config_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 #if HAVE_FOO in a source file
make sure you use #if HAVE_FOO for on/off settings, do not use #ifdef