Date: Mon, 12 Jan 2009 11:55:11 +0000 From: "Andrew Brampton" <brampton@gmail.com> To: hackers@freebsd.org Subject: Determine if a kernel is built with a specific option? Message-ID: <d41814900901120355h780a3232u14fa1e5da8f280ad@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hi,
I was wondering how a autoconf configure script can determine if the
kernel is built with a particular option. In this case the code I have
can make use of the FreeBSD polling driver, which by default isn't
built into a kernel. So I want my configure script to determine if the
kernel supports it, if so sets a #define, otherwise doesn't.
In the past I have basically hacked my way though these configure
scripts by looking at other examples. One such example I found was for
Linux, which does something like this:
AC_CACHE_CHECK(for device polling kernel extension, ac_cv_linux_poll_extension,
[if grep polling `find_linuxpath include/linux/netdevice.h` >/dev/null
2>&1; then
ac_cv_linux_poll_extension=yes
else ac_cv_linux_poll_extension=no; fi])
if test $ac_cv_linux_poll_extension = yes; then
AC_DEFINE(HAVE_LINUX_POLLING)
fi
So I simply want to figure out an equalavant check I can do on FreeBSD.
thanks
Andrew
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?d41814900901120355h780a3232u14fa1e5da8f280ad>