Fix the optnone attribute, add extension attribute

See how the various compilers handle these

Signed-off-by: Ralph Castain <rhc@open-mpi.org>

Author: Ralph Castain

config/opal_check_attributes.m4

@@ -561,12 +561,18 @@ AC_DEFUN([OPAL_CHECK_ATTRIBUTES], [
 
     _OPAL_CHECK_SPECIFIC_ATTRIBUTE([optnone],
         [
-        void foo(void) __attribute__ ((__optnone__));
+        void __attribute__ ((__optnone__)) foo(void);
         void foo(void) { return ; }
         ],
         [],
         [])
 
+    _OPAL_CHECK_SPECIFIC_ATTRIBUTE([extension],
+        [
+         #define FOO __extension__ ({size_t bar; bar = 3;})
+        ],
+        [],
+        [])
   fi
 
   # Now that all the values are set, define them
@@ -621,4 +627,6 @@ AC_DEFUN([OPAL_CHECK_ATTRIBUTES], [
                      [Whether your compiler has __attribute__ destructor or not])
   AC_DEFINE_UNQUOTED(OPAL_HAVE_ATTRIBUTE_OPTNONE, [$opal_cv___attribute__optnone],
                      [Whether your compiler has __attribute__ optnone or not])
+  AC_DEFINE_UNQUOTED(OPAL_HAVE_ATTRIBUTE_EXTENSION, [$opal_cv___attribute__extension],
+                     [Whether your compiler has __attribute__ extension or not])
 ])

opal/include/opal_config_bottom.h

@@ -240,6 +240,12 @@
 #    define __opal_attribute_optnone__
 #endif
 
+#if OPAL_HAVE_ATTRIBUTE_EXTENSION
+#    define __opal_attribute_extension__    __extension__
+#else
+#    define __opal_attribute_extension__
+#endif
+
 #  if OPAL_C_HAVE_VISIBILITY
 #    define OPAL_DECLSPEC           __opal_attribute_visibility__("default")
 #    define OPAL_MODULE_DECLSPEC    __opal_attribute_visibility__("default")

orte/orted/orted_submit.c

@@ -173,7 +173,7 @@ char MPIR_attach_fifo[MPIR_MAX_PATH_LENGTH] = {0};
 int MPIR_force_to_main = 0;
 static void orte_debugger_init_before_spawn(orte_job_t *jdata);
 
-ORTE_DECLSPEC void* MPIR_Breakpoint(void)  __opal_attribute_optnone__;
+ORTE_DECLSPEC void* __opal_attribute_optnone__ MPIR_Breakpoint(void);
 
 /*
  * Breakpoint function for parallel debuggers