Re: libtool C++ link bug with -lm functions with Sun Workshop compiler

[Bob Friesenhahn]

On Thu, 20 Mar 2008, Tim Mooney wrote:
> > Perhaps it is not best to run most of your configure script using the C++ 
> > compiler.  Only run the C++ compiler to test C++ things.
>
> I don't disagree, but at the same time, if everything a project is going
> to build is going to be compiled by the C++ compiler, doesn't it make
> sense for the C++ compiler to actually do the tests?  If it's the C++

Good point.  However, it may be that some autoconf tests intended for 
C don't work properly when used with the C++ compiler.

> compiler that needs to see the prototype for sqrt(), and it's the C++
> compiler that's going to initiate the link, it doesn't make a lot of
> sense for the tests to be conducted by the C compiler.  That's hardly a
> good test; there are several reasons why what the C compiler can see for
> prototypes or test link might differ from what the C++ compiler would.
>
> There are projects out there, beyond GNU aspell, that are using the C++
> compiler for many of the configure tests.  Are they all wrong to do so?

I don't recall if you mentioned the libtool version you are using. 
Libtool 2.2 usually uses the C++ compiler to link C++ programs and 
libraries.  I just re-verified that it does do so for Solaris 10 with 
the Studio 12 compiler.  Upgrading to 2.2, or the first subsequent 
release (scheduled for April 1st) may be the solution you are looking 
for.

Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/