Add lto version check mechanism.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45238 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/LinkTimeOptimizer.h b/include/llvm/LinkTimeOptimizer.h
index 164232d..fe87ae0 100644 (file)
--- a/include/llvm/LinkTimeOptimizer.h
+++ b/include/llvm/LinkTimeOptimizer.h
@@ -20,6 +20,8 @@
 #include <set>
 #include <llvm/ADT/hash_map>
 
+#define LLVM_LTO_VERSION 1
+
 namespace llvm {
 
   class Module;
@@ -148,6 +150,6 @@ namespace llvm {
 /// linker to use dlopen() interface to dynamically load LinkTimeOptimizer.
 /// extern "C" helps, because dlopen() interface uses name to find the symbol.
 extern "C"
-llvm::LinkTimeOptimizer *createLLVMOptimizer();
+llvm::LinkTimeOptimizer *createLLVMOptimizer(unsigned VERSION = LLVM_LTO_VERSION);
 
 #endif

diff --git a/tools/lto/lto.cpp b/tools/lto/lto.cpp
index e7e00e7..bc75234 100644 (file)
--- a/tools/lto/lto.cpp
+++ b/tools/lto/lto.cpp
@@ -45,8 +45,11 @@
 using namespace llvm;
 
 extern "C"
-llvm::LinkTimeOptimizer *createLLVMOptimizer()
+llvm::LinkTimeOptimizer *createLLVMOptimizer(unsigned VERSION)
 {
+  if (VERSION != LLVM_LTO_VERSION)
+    return NULL;
+
   llvm::LTO *l = new llvm::LTO();
   return l;
 }