1 files changed, 11 insertions, 0 deletions
diff --git a/Source/cmLocalUnixMakefileGenerator3.cxx b/Source/cmLocalUnixMakefileGenerator3.cxx
index 6ca386c..ec1d2c4 100644
--- a/Source/cmLocalUnixMakefileGenerator3.cxx
+++ b/Source/cmLocalUnixMakefileGenerator3.cxx
@@ -1686,6 +1686,17 @@ void cmLocalUnixMakefileGenerator3
                       "default_target",
                       depends,
                       no_commands, true);
+
+  // Help out users that try "gmake target1 target2 -j".
+  cmGlobalUnixMakefileGenerator3* gg =
+    static_cast<cmGlobalUnixMakefileGenerator3*>(this->GlobalGenerator);
+  if(gg->AllowNotParallel())
+    {
+    std::vector<std::string> no_depends;
+    this->WriteMakeRule(ruleFileStream,
+      "Allow only one \"make -f Makefile2\" at a time, but pass parallelism.",
+      ".NOTPARALLEL", no_depends, no_commands, true);
+    }
   }
 
   this->WriteSpecialTargetsTop(ruleFileStream);