Conf: Check for enabled pthreads when using BFD

BFD protocol strictly depends on pthreads being enabled,
but the compilation configuration checks do not reflect it now.

Add a check for pthreads when BFD is included in the
configured protocols.

Thank you Alexander Zubkov <green@qrator.net> for the report and patch!

Closes: #306

diff --git a/configure.ac b/configure.ac
index cf6a2d581faed39829d1cfe0d2939e08db6c5451..fc7f76e208869ef2eb28c04abda60927ede8785b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -340,6 +340,10 @@ AC_MSG_CHECKING([protocols])
 protocols=`echo "$with_protocols" | sed 's/,/ /g'`
 if test "$protocols" = no ; then protocols= ; fi
 for a in $protocols ; do
+  if test "$a" = bfd && ! test "$enable_pthreads" = yes ; then
+    AC_MSG_RESULT([failed])
+    AC_MSG_ERROR([Protocol $a requires pthreads])
+  fi
   if ! test -f $srcdir/proto/$a/Makefile ; then
     AC_MSG_RESULT([failed])
     AC_MSG_ERROR([Requested protocol $a not found])