_SGI_MP_SOURCE errno/h_errno experiment

acconfig.h

@@ -36,6 +36,10 @@
 #undef _THREAD_SAFE
 #endif
 
+#ifndef _SGI_MP_SOURCE
+#undef _SGI_MP_SOURCE
+#endif
+
 /* define this if cross compiling */
 #undef CROSS_COMPILING
 

configure.in

@@ -1168,6 +1168,7 @@ if test $ol_link_threads != no ; then
 	AC_DEFINE(_THREAD_SAFE,1)
 	AC_DEFINE(THREADSAFE,1)
 	AC_DEFINE(_THREADSAFE,1)
+	AC_DEFINE(_SGI_MP_SOURCE,1)
 
 	dnl The errno declaration may dependent upon _REENTRANT.
 	dnl If it does, we must link with thread support.

include/portable.h.in

@@ -118,6 +118,10 @@
 #undef _THREAD_SAFE
 #endif
 
+#ifndef _SGI_MP_SOURCE
+#undef _SGI_MP_SOURCE
+#endif
+
 /* define if you have crypt */
 #undef HAVE_CRYPT