From 5b44e10fb7e9d1226af11df26ee5fa78b8d54cc3 Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@fnordig.de>
Date: Wed, 13 Jul 2016 00:42:44 +0200
Subject: [PATCH] [LLVM-3.9] Preserve certain functions when internalizing

This makes sure to still use the old way for older LLVM versions.
---
 src/rustllvm/PassWrapper.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/rustllvm/PassWrapper.cpp b/src/rustllvm/PassWrapper.cpp
index 95ad686161f1..64edc79a86a3 100644
--- a/src/rustllvm/PassWrapper.cpp
+++ b/src/rustllvm/PassWrapper.cpp
@@ -358,9 +358,24 @@ LLVMRustAddAlwaysInlinePass(LLVMPassManagerBuilderRef PMB, bool AddLifetimes) {
 
 extern "C" void
 LLVMRustRunRestrictionPass(LLVMModuleRef M, char **symbols, size_t len) {
-    PassManager passes;
+    llvm::legacy::PassManager passes;
+
+#if LLVM_VERSION_MINOR <= 8
     ArrayRef<const char*> ref(symbols, len);
     passes.add(llvm::createInternalizePass(ref));
+#else
+    auto PreserveFunctions = [=](const GlobalValue &GV) {
+        for (size_t i=0; i<len; i++) {
+            if (GV.getName() == symbols[i]) {
+                return true;
+            }
+        }
+        return false;
+    };
+
+    passes.add(llvm::createInternalizePass(PreserveFunctions));
+#endif
+
     passes.run(*unwrap(M));
 }