Re: multithread CPPFLAGS

[Yoann Vandoorselaere]

Hi Bruno,

Le lundi 25 août 2008 à 11:46 +0200, Bruno Haible a écrit :
> Yoann Vandoorselaere wrote:
> > >   - it does not need to see a thread-aware errno,
> > > hence it does not need to compile with THREADCPPFLAGS.
> > 
> > Not using a thread-aware errno from an application that indirectly use
> > thread through a library (which use thread-aware errno). Are you
> > completely sure this is safe?
> 
> Instead of discussing whether I'm "completely sure" and what we can "assume",
> can you show a test program that decides the question without any doubt?

We'd need to know the problem deeper in order to write a specific test
case (part of which should be written within a shared library). Right
now, what has been discussed is a potential problem with errno, but that
one is not especially harmful, and depending on the system, there might
be other issues.

Note that I wrote a simple test case using libprelude, and checking
errno value from a program using the threaded libprelude features, but
not using any specific threads CFLAGS in order to compile: no problem
noticed.

Is there any specific reason why you oppose adding this THREADCPPFLAGS
variable? It's a two line change and can always be useful (example:
providing thread dependencies to other program that might want to use
thread). 

-- 
Yoann Vandoorselaere <address@hidden>