When we re-exec the master makefile in a jobserver environment, ensure

that MAKEFLAGS is set properly so the re-exec'd make runs in parallel.
See Savannah bug #33873.

ChangeLog

@@ -1,5 +1,9 @@
 2011-09-18  Paul Smith  <psmith@gnu.org>
 
+	* main.c (main): If we're re-exec'ing and we're the master make,
+	then restore the job_slots value so it goes back into MAKEFLAGS
+	properly.  See Savannah bug #33873.
+
 	* remake.c (library_search): STD_DIRS is computed when other
 	static vars like buflen etc. are computed, so it must be static
 	as well.  See Savannah bug #32511.

main.c

@@ -2089,6 +2089,11 @@ main (int argc, char **argv, char **envp)
 
           ++restarts;
 
+          /* If we're re-exec'ing the first make, put back the number of
+             job slots so define_makefiles() will get it right.  */
+          if (master_job_slots)
+            job_slots = master_job_slots;
+
           /* Reset makeflags in case they were changed.  */
           {
             const char *pv = define_makeflags (1, 1);
@@ -2825,9 +2830,6 @@ define_makeflags (int all, int makefile)
 		       && (*(unsigned int *) cs->value_ptr ==
 			   *(unsigned int *) cs->noarg_value))
 		ADD_FLAG ("", 0); /* Optional value omitted; see below.  */
-	      else if (cs->c == 'j')
-		/* Special case for `-j'.  */
-		ADD_FLAG ("1", 1);
 	      else
 		{
 		  char *buf = alloca (30);

tests/ChangeLog

@@ -1,5 +1,8 @@
 2011-09-18  Paul Smith  <psmith@gnu.org>
 
+	* scripts/features/parallelism: On re-exec make sure we preserve
+	the value of MAKEFLAGS when necessary.  See Savannah bug #33873.
+
 	* scripts/features/vpath3: Verify handling of -lfoo libraries
 	found via vpath vs. the standard directory search.
 	See Savannah bug #32511.

tests/scripts/features/parallelism

@@ -167,6 +167,23 @@ inc.mk:
 
 rmfiles('inc.mk');
 
+# TEST #11: Make sure -jN from MAKEFLAGS is processed even when we re-exec
+# See Savannah bug #33873
+
+$extraENV{MAKEFLAGS} = '-j4';
+
+run_make_test(q!
+things = thing1 thing2
+all: $(things)
+$(things):; @echo '$@ start'; sleep 1; echo '$@ end'
+-include inc.mk
+inc.mk: ; @touch $@
+!,
+              '', "thing1 start\nthing2 start\nthing1 end\nthing2 end\n");
+
+delete $extraENV{MAKEFLAGS};
+rmfiles('inc.mk');
+
 if ($all_tests) {
     # Implicit files aren't properly recreated during parallel builds
     # Savannah bug #26864