Fix class extends with VM_PARALLEL_BUILDS (#2775).

Changes

@@ -9,6 +9,8 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ****  Fix $fread extra semicolon inside statements. [Leendert van Doorn]
 
+****  Fix class extends with VM_PARALLEL_BUILDS (#2775). [Iru Cai]
+
 ****  Fix examples not flushing vcd (#2787).  [Richard E George]
 
 

src/V3EmitC.cpp

@@ -3080,6 +3080,13 @@ void EmitCImp::emitIntTop(AstNodeModule*) {
 
 void EmitCImp::emitInt(AstNodeModule* modp) {
     puts("\n//==========\n\n");
+
+    if (AstClass* classp = VN_CAST(modp, Class)) {
+        if (classp->extendsp())
+            puts("#include \"" + prefixNameProtect(classp->extendsp()->classp()->classOrPackagep())
+                 + ".h\"\n");
+    }
+
     emitModCUse(modp, VUseType::INT_INCLUDE);
 
     // Declare foreign instances up front to make C++ happy

test_regress/t/t_class_extends.pl

@@ -11,6 +11,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 scenarios(simulator => 1);
 
 compile(
+    make_flags => 'VM_PARALLEL_BUILDS=1',  # bug2775
     );
 
 execute(