From 0f306eba2f7982a3ab98434204099b3397f43340 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 23 Dec 2009 19:12:50 +0000
Subject: [PATCH] Alternative fix to make sure that the extern declarations
 used by DynamicLibrary::SearchForAddressOfSymbol refer to declarations in the
 global namespace.

llvm-svn: 92023
---
 lib/System/DynamicLibrary.cpp | 52 +++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 23 deletions(-)

diff --git a/lib/System/DynamicLibrary.cpp b/lib/System/DynamicLibrary.cpp
index 7eb9f5f3ef8..63baa6d787c 100644
--- a/lib/System/DynamicLibrary.cpp
+++ b/lib/System/DynamicLibrary.cpp
@@ -69,29 +69,7 @@ bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
   return false;
 }
 
-void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
-  // First check symbols added via AddSymbol().
-  if (ExplicitSymbols) {
-    std::map<std::string, void *>::iterator I =
-      ExplicitSymbols->find(symbolName);
-    std::map<std::string, void *>::iterator E = ExplicitSymbols->end();
-  
-    if (I != E)
-      return I->second;
-  }
-
-  // Now search the libraries.
-  if (OpenedHandles) {
-    for (std::vector<void *>::iterator I = OpenedHandles->begin(),
-         E = OpenedHandles->end(); I != E; ++I) {
-      //lt_ptr ptr = lt_dlsym(*I, symbolName);
-      void *ptr = dlsym(*I, symbolName);
-      if (ptr) {
-        return ptr;
-      }
-    }
-  }
-
+static void *SearchForAddressOfSpecialSymbol(const char* symbolName) {
 #define EXPLICIT_SYMBOL(SYM) \
    extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
 
@@ -128,6 +106,34 @@ void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
 #endif
 
 #undef EXPLICIT_SYMBOL
+  return 0;
+}
+
+void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
+  // First check symbols added via AddSymbol().
+  if (ExplicitSymbols) {
+    std::map<std::string, void *>::iterator I =
+      ExplicitSymbols->find(symbolName);
+    std::map<std::string, void *>::iterator E = ExplicitSymbols->end();
+  
+    if (I != E)
+      return I->second;
+  }
+
+  // Now search the libraries.
+  if (OpenedHandles) {
+    for (std::vector<void *>::iterator I = OpenedHandles->begin(),
+         E = OpenedHandles->end(); I != E; ++I) {
+      //lt_ptr ptr = lt_dlsym(*I, symbolName);
+      void *ptr = dlsym(*I, symbolName);
+      if (ptr) {
+        return ptr;
+      }
+    }
+  }
+
+  if (void *Result = SearchForAddressOfSpecialSymbol(symbolName))
+    return Result;
 
 // This macro returns the address of a well-known, explicit symbol
 #define EXPLICIT_SYMBOL(SYM) \