+has_threads=false
+AC_MSG_CHECKING(whether to search for POSIX threads)
+AC_ARG_WITH(pthreads,
+ [[ --with-pthreads[=DIR] use POSIX threads [search in DIR/include and DIR/lib]]],
+ [
+ case "${withval}" in
+ no)
+ check_threads=false
+ ;;
+ *)
+ if test -d $withval/include; then
+ CPPFLAGS="$CPPFLAGS -I$withval/include"
+ CFLAGS="$CFLAGS -I$withval/include"
+ fi
+ if test -d $withval/lib; then
+ LDFLAGS="$LDFLAGS -L$withval/lib"
+ fi
+
+ check_threads=true
+ ;;
+ esac
+ ])
+
+if test x$check_threads = xtrue; then
+ AC_MSG_RESULT(yes)
+ AC_CHECK_HEADERS(pthread.h,
+ [
+ SAVE_LIBS="$LIBS"
+ LIBS="$LIBS -lpthread"
+ AC_CHECK_LIB(pthread, pthread_attr_init, has_threads=true,
+ [
+ # FreeBSD
+ case "${target}" in
+ *-*-freebsd*)
+ LIBS="$SAVE_LIBS -pthread"
+ AC_CHECK_LIB(c_r, pthread_attr_init, has_threads=true)
+ ;;
+ esac
+ ])
+ ],
+ [
+ # search for pthread library..
+ SAVE_CPPFLAGS="$CPPFLAGS"
+ SAVE_CFLAGS="$CFLAGS"
+ SAVE_LDFLAGS="$LDFLAGS"
+
+ for dir in `echo "/usr/local /usr/pkg /usr/contrib /usr/pkg/pthreads /usr/local/pthreads"`; do
+ if test x$has_threads = xfalse; then
+ AC_MSG_RESULT(searching in $dir...)
+
+ CPPFLAGS="$SAVE_CPPFLAGS"
+ CFLAGS="$SAVE_CFLAGS"
+ LDFLAGS="$SAVE_LDFLAGS"
+
+ if test -d $dir/include; then
+ CPPFLAGS="$CPPFLAGS -I$dir/include"
+ CFLAGS="$CFLAGS -I$dir/include"
+ fi
+ if test -d $dir/lib; then
+ LDFLAGS="$LDFLAGS -L$dir/lib"
+ fi
+
+ # XXX
+ unset ac_cv_header__pthread_h_ ac_cv_header_pthread_h || true
+
+ AC_CHECK_HEADERS(pthread.h,
+ [
+ LIBS="$LIBS -lpthread"
+ AC_CHECK_LIB(pthread, pthread_attr_init, has_threads=true,
+ has_threads=false)
+ ])
+ fi
+ done
+ ])
+else
+ AC_MSG_RESULT(no)
+ has_threads=false
+fi
+
+AM_CONDITIONAL(SILC_THREADS, test x$has_threads = xtrue)
+if test x$has_threads = xtrue; then
+ CFLAGS="$CFLAGS -D_REENTRANT"
+
+ # XXX possibly incomplete
+ case "${target}" in
+ *-*-aix*)
+ CFLAGS="$CFLAGS -D_THREAD_SAFE"
+ if test x"$GCC" = xyes; then
+ CFLAGS="$CFLAGS -mthreads"
+ fi
+ ;;
+ *-*-freebsd*)
+ CFLAGS="$CFLAGS -D_THREAD_SAFE"
+ ;;
+ *-*-sysv5uw7*) # UnixWare 7
+ if test "$GCC" != "yes"; then
+ CFLAGS="$CFLAGS -Kthread"
+ else
+ CFLAGS="$CFLAGS -pthread"
+ fi
+ ;;
+ *-dg-dgux*) # DG/UX
+ CFLAGS="$CFLAGS -D_POSIX4A_DRAFT10_SOURCE"
+ ;;
+ esac
+
+ AC_CHECK_FUNC(pthread_create)
+ AC_DEFINE(SILC_HAVE_PTHREAD)
+ AC_DEFINE(SILC_THREADS)
+fi
+