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Re: libtool for C++
Re: libtool for C++
Mon, 28 Jan 2002 11:20:32 -0600
It is NOT up-to-date for CVS HEAD and alpha versions of Libtool.
"Steve M. Robbins" wrote:
> The libtool manual suggests strongly that one not use it
> for C++ libraries.
> Is this section of the document up-to-date with the stable
> release of libtool? CVS libtool?
> -------------------- from libtool manual ---------------------
> 11.1 Writing libraries for C++
> Creating libraries of C++ code should be a fairly straightforward
> process, because its object files differ from C ones in only three
> 1.Because of name mangling, C++ libraries are only usable by
> the C++ compiler that created them. This decision was made
> by the designers of C++ in order to protect users from
> conflicting implementations of features such as constructors,
> exception handling, and RTTI.
> 2.On some systems, the C++ compiler must take special actions
> for the dynamic linker to run dynamic (i.e., run-time)
> initializers. This means that we should not call `ld' directly to
> link such libraries, and we should use the C++ compiler
> 3.C++ compilers will link some Standard C++ library in by
> default, but libtool does not know which are these libraries, so
> it cannot even run the inter-library dependence analyzer to
> check how to link it in. Therefore, running `ld' to link a C++
> program or library is deemed to fail. However, running the
> C++ compiler directly may lead to problems related with
> inter-library dependencies.
> The conclusion is that libtool is not ready for general use for C++
> libraries. You should avoid any global or static variable
> initializations that would cause an "initializer element is not
> constant" error if you compiled them with a standard C compiler.
> There are other ways of working around this problem, but they are
> beyond the scope of this manual.
> Furthermore, you'd better find out, at configure time, what are the
> C++ Standard libraries that the C++ compiler will link in by
> default, and explicitly list them in the link command line.
> Hopefully, in the future, libtool will be able to do this job by itself.
> From this section, it is unclear whether libtool uses the C++
> compiler or "ld" to do the linking. If the former, then it sounds
> like the remaining hurdle (from #3) is to discover with which
> standard libraries the compiler is linking. Is this accurate?
> by Rocket to the Moon,
> by Airplane to the Rocket,
> by Taxi to the Airport,
> by Frontdoor to the Taxi,
> by throwing back the blanket and laying down the legs ...
> - They Might Be Giants
> Libtool mailing list
Robert Boehne Software Engineer
Ricardo Software Chicago Technical Center
TEL: (630)789-0003 x. 238
- libtool for C++, Steve M. Robbins, 2002/01/25
- Re: libtool for C++,
Robert Boehne <=