Fix for bug #17. Solaris provides stubs (who knows why, but they do) for

the pthreads library that don't do anything but are there when no special
options are given.  Both the GNU compiler and the Sun compiler could
sometimes ignore the -K* options, causing badness when building with
posix threads.  Don't try those options ;).

We still try -pthread and -pthreads because the compilers *do* error
when they see those options and some versions of the GNU compiler do
understand those flags (and do all the right things in that case).

This commit was SVN r10126.

config/ompi_config_pthreads.m4

@@ -381,7 +381,15 @@ AC_DEFUN([OMPI_INTL_POSIX_THREADS_SPECIAL_FLAGS],[
 # Put -mt before -mthreads because HP-UX aCC will properly compile
 # with -mthreads (reading as -mt), but emit a warning about unknown
 # flags hreads.  Stupid compilers.
-pflags="-Kthread -kthread -pthread -pthreads -mt -mthreads"
+
+case "${host_cpu}-${host_os}" in
+  *solaris*)
+    pflags="-pthread -pthreads -mt"
+  ;;
+  *)
+    pflags="-Kthread -kthread -pthread -pthreads -mt -mthreads"
+  ;;
+esac
 
 # Only run C++ and Fortran if those compilers already configured
 AC_PROVIDE_IFELSE([AC_PROG_CC],