On Mon, 5 Oct 2009, Ben Pfaff wrote:
To try to head off the problem, I'm thinking about putting
something like this after each command that adds to LIBS:
AC_RUN_IFELSE([AC_LANG_PROGRAM([], [])],
[:],
[AC_MSG_FAILURE([Cannot run program linked against $LIBS.])],
[:])
Am I on the right track? It seems to me that there should
already be a mechanism to help with this, but I do not see one.
This is a rather complex issue since the problem can be corrected by
LD_LIBRARY_LFLAGS, ldconfig/crle, by formally installing the library,
or by libtool at link time. Since autoconf does not use libtool in
its testing, it does not benefit from the extra smarts provided by
libtool, and so autoconf tests are more fragile. For example,
autoconf can't know about library dependencies that libtool may be
able to figure out later (via installed .la files) and so the
configure script developer needs to provide way to add all of these
dependencies to LIBS.
In summary, your idea seems nice, but it might block builds which
would otherwise succeed and work.
Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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