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Porting apcupsd seem to be quite easy at least at first glance.
OS detection:
it is done configure.in with the macro AM_CONDITIONAL and AC_DEFINE.
The AM_CONDITIONAL is for Makefile generating HAVE_SUN_OS_TRUE=' ' or
HAVE_SUN_OS_TRUE='#' for example if you have or not SUNOS. It expand these
variables and they become comments or spaces. Now it is used for selecting the
compiler switches.
The AC_DEFINE define HAVE_SUN_OS in the config.h file so that the C
preprocessor can know which OS we are compiling for.
For adding a new OS:
In configure.in add:
if test $HAVE_UNAME=yes -a x`uname -s` = xSunOS
then
AM_CONDITIONAL(HAVE_NEW_OS, /bin/true)
AC_DEFINE(HAVE_NEW_OS)
else
AM_CONDITIONAL(HAVE_NEW_OS, /bin/false)
fi
In acconfig.h add:
#undef HAVE_NEW_OS
then regenerate the configure script and config.h.in files with autoregen.sh.
This thing is useful for compilers too. I have added checks for GCC so that
the Makefile know if we are using GCC or not.
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