Re: Libtool mishandling of C++ libraries requiring -pthread

[Peter O'Gorman]

On 02/01/2012 05:49 PM, Bob Friesenhahn wrote:

> The libltdl module loader does need to load the dependency libraries
> since the system might not do this at all, or might not do it fully or
> correctly. It can't do this without knowing the libraries used. This has
> been known to be a definite factor for C-language modules which link
> with C++ libraries.
>
> If Gary is reading this, I assume that his memory would be better than
> mine and perhaps he can add some wisdom.
>
> > Note that the GCC maintainters closed the bug requesting -pthread still
> > add -lpthread even under -nostdlib as invalid.
>
> I would have done the same.
>
> The easiest fix is likely for libtool to know that if -pthread was
> specified to the compiler that it should add -lthread while linking.

Well, I don't know why libtool insists on -nostdlib, but I think we 
should just give up on it and assume the compiler works.

If g++ creates output on any platform that is unable to find libstdc++ 
at runtime then that is a broken compiler, in my opinion.

It's easier by far to stop trying to second guess the compiler than 
adding more complications (translating -pthread to whatever the threads 
library is).

Peter