On May 26, 2004, Bob Friesenhahn <[EMAIL PROTECTED]> wrote: > It also depends on libtool being 100% accurate in determining if a > library is a static library or a shared library since static > libraries don't support library dependencies.
And there's another problem. When libtool passes -ldependency in the command line, the linker will look for libdependency in the directories where it looks for libraries (-L). If libdependency is only brought in by another shared library that has it in DT_RPATH, libdependency will be looked for in the --rpath-link search path, and it will have to be a shared library, i.e., static libs will be ignored. Now consider the following scenario: - libfoo.la is linked with libdep.la, but libdep.la was PIC and static-only. Both are installed. - libdep is rebuilt as both static and shared, and reinstalled. - program links with libfoo.la, using symbols from libdep.la that weren't brought into libfoo.la - libtool sees libdep.la is available as a shared lib, so it drops it from the link command. Link fails because libfoo.so doesn't bring in libdep.a. The only way to avoid this sort of problem would be to annotate libfoo.la with some indication that libdep.la was static-only at the time libfoo.la was created, as opposed to attempting to detect what kind of lib it is at the time libfoo.la is linked into something else. I.e., for libraries that are built as both dynamic and static, libtool would have to keep two dependency lists, one for the dynamic version, and one for the static version, such that the dynamic dependency list doesn't contain dependencies that are shared libraries. I think it can be made to work, but it's going to be a significant amount of work, and there are probably some additional problems that I haven't thought of. Risky... -- Alexandre Oliva http://www.ic.unicamp.br/~oliva/ Red Hat Compiler Engineer [EMAIL PROTECTED], gcc.gnu.org} Free Software Evangelist [EMAIL PROTECTED], gnu.org} _______________________________________________ Libtool mailing list [EMAIL PROTECTED] http://lists.gnu.org/mailman/listinfo/libtool
