On Tue, 21 Oct 2003, Bill Moseley wrote: > I'm revisiting an old thread. I'm using autoconf 2.57. > > http://mail.gnu.org/archive/html/autoconf/2003-06/msg00013.html > > If I use AC_CHECK_LIB does configure try to *run* the program? No. It only does a link to see if the specified symbol is resolved. > What's happening is configure and make run fine, but ldd shows "not > found" for libz's runtime linkage. > > I'm linking with zlib which is installed in /usr/local/lib, but it seems > that on this machine (Solaris 2.6) that /usr/local/lib is not part of > the default search path. > > This causes confusion because configure is saying libz is found and then > make check fails saying libz is not found. A correct -R option needs to be specified, or set LD_LIBRARY_PATH > Another thing that is confusing (and I'm not sure if it's related to why > configure is not failing the libz check) is that the problem only > happens when using a --prefix setting. > > Without a --prefix the final link link has -R/usr/local/lib added. > But if --prefix=/foo is used then that -R setting is *replaced* with > -R/foo. I understand that, but I'm wondering if configure should also > be prefix aware. I don't believe that Autoconf uses or provides -R options at all. It sounds like this is coming from elsewhere within the configure script. > So the result is the program only fails when a --prefix is used, which > is also confusing for the person trying to install the application. > > It would be nice if configure would catch this. But I'm not sure if > it's because configure is not actually running the test program for > zlib, or if configure is using a different -R when linking the test > program vs. linking the application. > > Or maybe it's something completely different. Autoconf does not establish a linker run path by default since that would be highly controversial, and would break many package distribution schemes. You probably will need to arrange for setting a linker run path within your portion of the configure script. If you are not cross-compiling, then you are free to compile, link, and run, rather than just compiling and linking. Bob ====================================== Bob Friesenhahn bfriesen@xxxxxxxxxxxxxxxxxxx http://www.simplesystems.org/users/bfriesen
