Index: llvm/trunk/include/llvm-c/Core.h
===================================================================
--- llvm/trunk/include/llvm-c/Core.h
+++ llvm/trunk/include/llvm-c/Core.h
@@ -481,6 +481,26 @@
 void LLVMDisposeModule(LLVMModuleRef M);
 
 /**
+ * Obtain the identifier of a module.
+ *
+ * @param M Module to obtain identifier of
+ * @param Len Out parameter which holds the length of the returned string.
+ * @return The identifier of M.
+ * @see Module::getModuleIdentifier()
+ */
+const char *LLVMGetModuleIdentifier(LLVMModuleRef M, size_t *Len);
+
+/**
+ * Set the identifier of a module to a string Ident with length Len.
+ *
+ * @param M The module to set identifier
+ * @param Ident The string to set M's identifier to
+ * @param Len Length of Ident
+ * @see Module::setModuleIdentifier()
+ */
+void LLVMSetModuleIdentifier(LLVMModuleRef M, const char *Ident, size_t Len);
+
+/**
  * Obtain the data layout for a module.
  *
  * @see Module::getDataLayoutStr()
Index: llvm/trunk/lib/IR/Core.cpp
===================================================================
--- llvm/trunk/lib/IR/Core.cpp
+++ llvm/trunk/lib/IR/Core.cpp
@@ -157,6 +157,17 @@
   delete unwrap(M);
 }
 
+const char *LLVMGetModuleIdentifier(LLVMModuleRef M, size_t *Len) {
+  auto &Str = unwrap(M)->getModuleIdentifier();
+  *Len = Str.length();
+  return Str.c_str();
+}
+
+void LLVMSetModuleIdentifier(LLVMModuleRef M, const char *Ident, size_t Len) {
+  unwrap(M)->setModuleIdentifier(StringRef(Ident, Len));
+}
+
+
 /*--.. Data layout .........................................................--*/
 const char *LLVMGetDataLayoutStr(LLVMModuleRef M) {
   return unwrap(M)->getDataLayoutStr().c_str();
Index: llvm/trunk/tools/llvm-c-test/echo.cpp
===================================================================
--- llvm/trunk/tools/llvm-c-test/echo.cpp
+++ llvm/trunk/tools/llvm-c-test/echo.cpp
@@ -865,9 +865,18 @@
   LLVMEnablePrettyStackTrace();
 
   LLVMModuleRef Src = llvm_load_module(false, true);
-
+  size_t Len;
+  const char *ModuleName = LLVMGetModuleIdentifier(Src, &Len);
   LLVMContextRef Ctx = LLVMContextCreate();
-  LLVMModuleRef M = LLVMModuleCreateWithNameInContext("<stdin>", Ctx);
+  LLVMModuleRef M = LLVMModuleCreateWithNameInContext(ModuleName, Ctx);
+
+  // This whole switcharound is done because the C API has no way to
+  // set the source_filename
+  LLVMSetModuleIdentifier(M, "", 0);
+  LLVMGetModuleIdentifier(M, &Len);
+  if (Len != 0)
+      report_fatal_error("LLVM{Set,Get}ModuleIdentifier failed");
+  LLVMSetModuleIdentifier(M, ModuleName, strlen(ModuleName));
 
   LLVMSetTarget(M, LLVMGetTarget(Src));
   LLVMSetModuleDataLayout(M, LLVMGetModuleDataLayout(Src));