* main.c (die): Close output_context AND make_sync.

die() can be invoked inside a separate output_context, if the
$(error ...) function is expanded as part of a recipe.

main.c

@@ -3406,9 +3406,14 @@ die (int status)
 
       if (output_context)
         {
-          assert (output_context == &make_sync);
+          /* die() might be called in a recipe output context due to an
+             $(error ...) function.  */
+          output_close (output_context);
+
+          if (output_context != &make_sync)
+            output_close (&make_sync);
+
           OUTPUT_UNSET ();
-          output_close (&make_sync);
         }
 
       output_close (NULL);

tests/scripts/features/output-sync

@@ -330,5 +330,12 @@ t1: ; -\@\$(MAKE) -f $m1
 
 rmfiles($m1);
 
+# Test $(error ...) functions in recipes
+
+run_make_test(q!
+foo: $(OBJS) ; echo $(or $(filter %.o,$^),$(error fail))
+!,
+              '-O', "#MAKEFILE#:2: *** fail.  Stop.\n", 512);
+
 # This tells the test driver that the perl test script executed properly.
 1;