vendor/llvm/llvm-trunk-r301939

1 files changed, 11 insertions, 0 deletions

diff --git a/include/llvm/Transforms/Utils/ModuleUtils.h b/include/llvm/Transforms/Utils/ModuleUtils.h
index f5e843e2e8b5..e9793fe4b666 100644
--- a/include/llvm/Transforms/Utils/ModuleUtils.h
+++ b/include/llvm/Transforms/Utils/ModuleUtils.h
@@ -84,6 +84,17 @@ void appendToCompilerUsed(Module &M, ArrayRef<GlobalValue *> Values);
 void filterDeadComdatFunctions(
     Module &M, SmallVectorImpl<Function *> &DeadComdatFunctions);
 
+/// \brief Produce a unique identifier for this module by taking the MD5 sum of
+/// the names of the module's strong external symbols.
+///
+/// This identifier is normally guaranteed to be unique, or the program would
+/// fail to link due to multiply defined symbols.
+///
+/// If the module has no strong external symbols (such a module may still have a
+/// semantic effect if it performs global initialization), we cannot produce a
+/// unique identifier for this module, so we return the empty string.
+std::string getUniqueModuleId(Module *M);
+
 } // End llvm namespace
 
 #endif //  LLVM_TRANSFORMS_UTILS_MODULEUTILS_H