Build system: give the possibility to disable POSIX threads in configure script

(cherry picked from commit f560ae8f)

license.txt

@@ -162,7 +162,7 @@ License: LGPL-3+
  You should have received a copy of the GNU Lesser General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-Files: m4/ax_blas.m4, m4/ax_lapack.m4, m4/ax_pthread.m4
+Files: m4/ax_blas.m4, m4/ax_lapack.m4
 Copyright: 2008, Steven G. Johnson <stevenj@alum.mit.edu>
 License: GPL-3+ with special Autoconf exception
  This program is free software: you can redistribute it and/or modify it
@@ -191,6 +191,36 @@ License: GPL-3+ with special Autoconf exception
  modified version of the Autoconf Macro, you may extend this special
  exception to the GPL to apply to your modified version as well.
 
+Files: m4/ax_pthread.m4
+Copyright: 2008, Steven G. Johnson <stevenj@alum.mit.edu>
+           2010, Dynare Team
+License: GPL-3+ with special Autoconf exception
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation, either version 3 of the License, or (at your
+ option) any later version.
+ .
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ Public License for more details.
+ .
+ You should have received a copy of the GNU General Public License along
+ with this program. If not, see <http://www.gnu.org/licenses/>.
+ .
+ As a special exception, the respective Autoconf Macro's copyright owner
+ gives unlimited permission to copy, distribute and modify the configure
+ scripts that are the output of Autoconf when processing the Macro. You
+ need not follow the terms of the GNU General Public License when using
+ or distributing such scripts, even though portions of the text of the
+ Macro appear in them. The GNU General Public License (GPL) does govern
+ all other use of the material that constitutes the Autoconf Macro.
+ .
+ This special exception to the GPL applies to versions of the Autoconf
+ Macro released by the Autoconf Archive. When you make and distribute a
+ modified version of the Autoconf Macro, you may extend this special
+ exception to the GPL to apply to your modified version as well.
+
 Files: m4/ax_boost_base.m4
 Copyright: 2008, Thomas Porschberg <thomas@randspringer.de>
            2009, Dynare Team

m4/ax_pthread.m4

@@ -48,6 +48,7 @@
 # LICENSE
 #
 #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
+#   Copyright (c) 2010 Dynare Team
 #
 #   This program is free software: you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
@@ -82,6 +83,10 @@ AC_LANG_SAVE
 AC_LANG_C
 ax_pthread_ok=no
 
+AC_ARG_WITH([pthread], [AS_HELP_STRING([--without-pthread], [don't use POSIX threads])], [], [with_readline=check])
+
+if test "x$with_pthread" != "xno"; then
+
   # We used to check for pthread.h first, but this fails if pthread.h
   # requires special compiler flags (e.g. on True64 or Sequent).
   # It gets checked for in the link test anyway.
@@ -260,6 +265,8 @@ AC_SUBST(PTHREAD_LIBS)
   AC_SUBST(PTHREAD_CFLAGS)
   AC_SUBST(PTHREAD_CC)
 
+fi
+
 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
 if test x"$ax_pthread_ok" = xyes; then
         ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])