Joe Maimon wrote: > The last time I had a problem with libltdl, I has to execute a make > manually in the source tree libltdl directory. > > After that everything worked, including rebuilds.
It turns out it's a problem with newer versions of libltdl. Warning: this message is long and complicated. To recap, when you see: ... undefined reference to `lt__PROGRAM__LTX_preloaded_symbols' it's a bug in libltdl / libtool. See: http://git.savannah.gnu.org/cgit/libtool.git/tree/libltdl/ltdl.h There's a line: #define lt_preloaded_symbols lt__PROGRAM__LTX_preloaded_symbols Which causes the problem. The apparent *intent* of the libtool crazies is to define this symbol inside of libtool. The source code they distribute contains this inside of their "libltdl/m4/libtool.m4": libtool.m4:lt__PROGRAM__LTX_preloaded_symbols[[]] = libtool.m4: return lt__PROGRAM__LTX_preloaded_symbols; Ok... that looks reasonable, right? Except that the *installed* version of libtool on the systems with this bug looks like: libtool:lt_${my_prefix}_LTX_preloaded_symbols[]; libtool:lt_${my_prefix}_LTX_preloaded_symbols[] = libtool: return lt_${my_prefix}_LTX_preloaded_symbols; And what is "my_prefix" set to? Nothing useful, that's for sure. But it gets better. There's *another* file distributed with the main libtool code. That file is intended to be used by projects like FreeRADIUS, in order to create the "right" version of libtool for each platform. FreeRADIUS has one (ltmain.sh, right beside the top-level configure and Makefile). The version of ltmain.sh distributed with the upstream libltdl source code has: ltmain.m4sh:lt_${my_prefix}_LTX_preloaded_symbols[]; ltmain.m4sh:lt_${my_prefix}_LTX_preloaded_symbols[] = ltmain.m4sh: return lt_${my_prefix}_LTX_preloaded_symbols; Aha! That's it. The ltmain.sh that everyone is supposed to use doesn't match the version of ltdl.h that they're also supposed to use. To recap, the version of libtool used to BUILD libltdl has the right symbols defined. But when libltdl is *installed*, that symbol disappears, and is replaced by lt_libltdl_LTX_preloaded_symbols. The version of libtool that the *suckers* like FreeRADIUS are supposed to use has references to t__PROGRAM__LTX_preloaded_symbols, but it does NOT have references to lt_libltdl_LTX_preloaded_symbols. It's like libtool and libltdl are some kind of sick joke. The solution *seems* to be simple. Update the FreeRADIUS source code to add: #define lt__PROGRAM__LTX_preloaded_symbols \ lt_libltdl_LTX_preloaded_symbols It then compiles and runs. Did I mention I hate libtool and libltdl? I hate them with a passion that (in contrast) makes a rabid dog look like a good babysitter for your children. Alan DeKok. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
