From ac524eff0d1fd4a2362c7470befc88f5f71ca62b Mon Sep 17 00:00:00 2001
From: jbrodman <james.brodman@intel.com>
Date: Thu, 4 Dec 2014 01:58:42 -0800
Subject: [PATCH] Add DLL storage class for export functions on windows

---
 module.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/module.cpp b/module.cpp
index 4102b31e..37c800e7 100644
--- a/module.cpp
+++ b/module.cpp
@@ -869,6 +869,13 @@ Module::AddFunctionDeclaration(const std::string &name,
     llvm::Function *function =
         llvm::Function::Create(llvmFunctionType, linkage, functionName.c_str(),
                                module);
+    
+#ifdef ISPC_IS_WINDOWS
+    // Make export functions callable from DLLS.
+    if (functionType->isExported) {
+      function->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
+    }
+#endif
 
     // Set function attributes: we never throw exceptions
     function->setDoesNotThrow();