Jean-Francois Dockes
2006-Jan-13 06:48 UTC
[Xapian-devel] xapian-config --libs outputs libstdc++.la as a dependency
Hello, I am hearing of users having trouble linking with libxapian (on slackware and gentoo systems, and 0.9.2 I think), and I am not too sure where the problem comes from, or what the correct solution could be, so I am just asking here in case someone has a quick answer. What happens is that "xapian-config --libs" outputs libstdc++.la in the list of libraries. Something like: -L/usr/i686-pc-linux-gnu/bin -L/usr/i686-pc-linux-gnu/lib \ /usr/lib/gcc/i686-pc-linux-gnu/3.4.4/libstdc++.la As recoll is linked with g++, this generates an error (I guess it might work if libtool was used?). The libstdc++ data seems to come from libxapian.la ('dependency_libs' variable). I don't see this happening on any on my systems (FreeBSD, Solaris, Redhat 7.3, Fedora core 4), so I guess I'll have to install gentoo somewhere to look into this, except if someone here can tell me what goes wrong and what I could do about it. I am pasting a libxapian.la (from a gentoo system) at the end of this message. Regards, J.F. Dockes # libxapian.la - a libtool library file # Generated by ltmain.sh - GNU libtool 1.5.18 (1.1220.2.245 2005/05/16 08:55:27) # # Please DO NOT delete this file! # It is necessary for linking the library. # The name that we can dlopen(3). dlname='libxapian.so.8' # Names of this library. library_names='libxapian.so.8.0.0 libxapian.so.8 libxapian.so' # The name of the static archive. old_library='libxapian.a' # Libraries that this one depends upon. dependency_libs=' -L/usr/i686-pc-linux-gnu/bin -L/usr/i686-pc-linux-gnu/lib /usr/lib/gcc/i686-pc-linux-gnu/3.4.4/libstdc++.la' # Version information for libxapian. current=8 age=0 revision=0 # Is this an already installed library? installed=yes # Should we warn about portability when linking against -modules? shouldnotlink=no # Files to dlopen/dlpreopen dlopen='' dlpreopen='' # Directory that this library needs to be installed in: libdir='/usr/lib'
Olly Betts
2006-Jan-13 21:47 UTC
[Xapian-devel] xapian-config --libs outputs libstdc++.la as a dependency
On Fri, Jan 13, 2006 at 07:48:10AM +0100, Jean-Francois Dockes wrote:> What happens is that "xapian-config --libs" outputs libstdc++.la in the > list of libraries. Something like: > > -L/usr/i686-pc-linux-gnu/bin -L/usr/i686-pc-linux-gnu/lib \ > /usr/lib/gcc/i686-pc-linux-gnu/3.4.4/libstdc++.laHmm, that's not good. I guess we need to recursively check for .la files in dependency_libs and substitute the actual library to link against, plus the contents of the .la file's dependency_libs. That's a bit fiddly though... We might be able to get away with just dropping libstdc++.la, since linking C++ code should pull it in anyway. I can't see any other .la files making it in there unless we start depending on other libraries. Anyway, I'll take a look.> As recoll is linked with g++, this generates an error (I guess it might > work if libtool was used?).If you're using libtool, then xapian-config --ltlibs should be used instead (which happens automatically if you use XO_LIB_XAPIAN in configure.in/configure.ac and use AC_PROG_LIBTOOL or AM_PROG_LIBTOOL). Cheers, Olly
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