cc: Add option to produce minimal crash reports and disable multithreading.

Author: xlauko

include/vast/Frontend/Options.hpp

@@ -73,7 +73,9 @@ namespace vast::cc
         constexpr string_ref emit_mlir = "emit-mlir";
 
         constexpr string_ref print_pipeline = "print-pipeline";
+        constexpr string_ref emit_crash_reproducer = "emit-crash-reproducer";
 
+        constexpr string_ref disable_multithreading = "disable-multithreading";
         constexpr string_ref debug = "debug";
 
         constexpr string_ref simplify = "simplify";

lib/vast/Frontend/Consumer.cpp

@@ -214,10 +214,6 @@ namespace vast::cc {
         );
         VAST_CHECK(pipeline, "failed to setup pipeline");
 
-        if (vargs.has_option(opt::print_pipeline)) {
-            pipeline->dump();
-        }
-
         auto result = pipeline->run(mod.get());
         VAST_CHECK(mlir::succeeded(result), "MLIR pass manager failed when running vast passes");
 

lib/vast/Frontend/Pipelines.cpp

@@ -128,6 +128,20 @@ namespace vast::cc {
             *passes << std::move(step);
         }
 
+        if (vargs.has_option(opt::print_pipeline)) {
+            passes->dump();
+        }
+
+        if (vargs.has_option(opt::disable_multithreading) || vargs.has_option(opt::emit_crash_reproducer)) {
+            mctx.disableMultithreading();
+        }
+
+        if (vargs.has_option(opt::emit_crash_reproducer)) {
+            auto reproducer_path = vargs.get_option(opt::emit_crash_reproducer);
+            VAST_CHECK(reproducer_path.has_value(), "expected path to reproducer");
+            passes->enableCrashReproducerGeneration(reproducer_path.value(), true /* local reproducer */);
+        }
+
         return passes;
     }