Re: Configure not selecting proper -pthread options

[Ralf Wildenhues]

Hi Kevin,

* Kevin Teich wrote on Thu, Apr 14, 2005 at 11:03:32PM CEST:
> 
> We use the ACX_PTHREAD macro from ac-archive to configure pthread options, 
> from http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html . 
> configure would execute successfully and determine that -pthread was the 
> correct option for this machine, but our programs would not compile, the 
> Makefiles generating link errors for undefined pthread symbols.
> 
> The reason for this is that when configure does its test to figure out how 
> to handle pthreads, it uses a combined compile/link line when testing 
> various options. The test it does for -pthread is to set CFLAGS to 
> -pthread and leave LIBS blank, and it generates a test like this:
*snip*
> Is this a bug, or a logic error in the ACX_PTHREAD macro, or a 
> misconfiguration on my part? Did I do the correct thing to fix it, or is 
> there another work-around?

You are not using ACX_PTHREAD correctly.  From the documentation:
| dnl NOTE: You are assumed to not only compile your program with these
| dnl flags, but also link it with them as well.  e.g. you should link
| dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS

Note I have this from http://ac-archive.sf.net, I don't know whether the
two archives are in sync w.r.t. this macro.

Regards,
Ralf