Hi Bob, thanks for your reply. Bob Friesenhahn ([EMAIL PROTECTED]):
> On Tue, 9 Dec 2003, Billy Biggs wrote: > > > I have a C program that uses a library which internally uses C++, > > [...] > > > > 1. Why does my program need to be linked with a C++ compiler in > > some cases and not in others? Shared libraries should bring in > > their own dependencies, or libtool should find them, no? Is > > something broken with how the library is built? > > Operating system support varies regarding embedded dependency > information in shared libraries, so depending on that feature is not > portable. Libtool would help handle library dependencies if the > problem library was linked using libtool, since then there would be a > .la file associated with the library which includes the known library > dependencies. > > Besides library dependencies, C++ code may also have different program > intialization requirements (e.g. to support static construction, > destruction, and exceptions) so a different startup module (the code > that eventually invokes main()) may be supplied by the compiler. OK, this makes sense, so this establishes that I should use a C++ compiler to link my program, now it's just a question of how. > > 2. I use libtool (but I do not understand why I use it). Is the > > following correct for my program_LINK command if I use libtool: > > > > program_LINK = $(LIBTOOL) --mode=link $(CXX) $(AM_CFLAGS) > > $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@ > > This seems to be from an Automake generated Makefile. Are you using > Automake? Passing the C++ compiler as the tool to use for linking > seems reasonable. I am using automake (hence why I posted to the automake list). I want to make sure that this is the 'correct' way to do this though, I find it scary to redefine the full link command like this when all I want to do is change the linker from using CCLD to CXX. > > 3. Who defines CXXLD and how? I have seen this variable > > referenced, it looks like I should use it above (to match CCLD), > > but nothing seems to define it. Is it obsolete? > > I believe that this is a definition generated by the AC_PROG_LIBTOOL > autoconf macro. If you are not including libtool with your package, > then this macro won't be defined. If you are embedding libtool in > your package, then you should definitely include AC_PROG_LIBTOOL in > configure.ac. I included AC_PROG_LIBTOOL in my configure.ac, along with AC_PROG_CXX and AC_LANG([C++]) yet none of this seems to get me CXXLD. $ libtool --version ltmain.sh (GNU libtool) 1.5.0a (1.1220.2.25 2003/08/01 19:08:35) Debian: 49 $ $ autoconf --version autoconf (GNU Autoconf) 2.57 Thanks again, -Billy _______________________________________________ Libtool mailing list [EMAIL PROTECTED] http://mail.gnu.org/mailman/listinfo/libtool
