= Config.site =


When cross-compiling, it's sometimes helpful to store the settings in a shell script, such as config.site.
For example: you may want to tell configure that RTEMS has a int32_t available to it, but the configure script can't find the int32_t, then config.site can be used to tell configure there is an int32_t.

For RTEMS, a place that would make sense for config.site might be: /opt/rtems-4.11/share/config.site

 # /opt/rtems-4.11/share/config.site for configure
     #
     # Change some defaults.
     test "$prefix" = NONE && prefix=/opt/rtems-4.11/
     test "$exec_prefix" = NONE && exec_prefix=/opt/rtems-4.11/
     test "$sharedstatedir" = '${prefix}/com' && sharedstatedir=/var
     test "$localstatedir" = '${prefix}/var' && localstatedir=/var
     
     # Give Autoconf 2.x generated configure scripts a shared default
     # cache file for feature test results, architecture-specific.
     if test "$cache_file" = /dev/null; then
       cache_file="$prefix/var/config.cache"
       # A cache file is only valid for one C compiler.
       CC=gcc
     fi

To get a configure script to read config.site input on the command line:
$ CONFIG_SITE=/opt/rtems-4.11/share/config.site=  References  =

http://www.gnu.org/software/autoconf/manual/autoconf-2.67/html_node/Site-Defaults.html