Re: [fedora-india] [fedora-classroom] Introductory workshop on GNU autotools
On Mon, May 3, 2010 at 6:48 PM, Bruno Wolff III <bruno(a)wolff.to> wrote:
On Mon, May 03, 2010 at 08:15:20 -0500,
Bruno Wolff III <bruno(a)wolff.to> wrote:
>
> I'll be travelling from home to work during the meeting time, so probably
> won't catch much of it live, but will read the logs after the fact.
> One question I have is how to handle when you need the math library and/or
> simple X stuff. I have been doing some DSO linking cleanup and have been
> recommending adding -lm or -lX11 to the prog_ADD type variable in the
> Makefile.am to fix these cases, but I am wondering if there is a better
> way to do that?
That should have been prog_LDADD.
If you want to be really generic (which is the point of autotools
anyway), you can use the AC_CHECK_LIB macro to check for presence of
the library in question (libm, libX11). So you will have:
AC_CHECK_LIB([m], [sin],,[AC_MSG_ERROR("No libm present")])
AC_CHECK_LIB([X11], [XOpenDisplay],,[AC_MSG_ERROR("No libX11 present")])
This does the check and adds the required flags to LDFLAGS if present.
If not, it returns an error.
--
Siddhesh Poyarekar
http://siddhesh.in