1 files changed, 40 insertions, 1 deletions
diff --git a/llvm/tools/llvm-mt/llvm-mt.cpp b/llvm/tools/llvm-mt/llvm-mt.cpp
index 05c9238c7c6..412883eb651 100644
--- a/llvm/tools/llvm-mt/llvm-mt.cpp
+++ b/llvm/tools/llvm-mt/llvm-mt.cpp
@@ -16,11 +16,13 @@
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/Error.h"
+#include "llvm/Support/FileOutputBuffer.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Signals.h"
+#include "llvm/Support/WindowsManifestMerger.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include <system_error>
@@ -67,6 +69,22 @@ LLVM_ATTRIBUTE_NORETURN void reportError(Twine Msg) {
   exit(1);
 }
 
+static void reportError(StringRef Input, std::error_code EC) {
+  reportError(Twine(Input) + ": " + EC.message());
+}
+
+void error(std::error_code EC) {
+  if (EC)
+    reportError(EC.message());
+}
+
+void error(Error EC) {
+  if (EC)
+    handleAllErrors(std::move(EC), [&](const ErrorInfoBase &EI) {
+      reportError(EI.message());
+    });
+}
+
 int main(int argc, const char **argv) {
   sys::PrintStackTraceOnErrorSignal(argv[0]);
   PrettyStackTraceProgram X(argc, argv);
@@ -104,7 +122,6 @@ int main(int argc, const char **argv) {
   }
 
   StringRef OutputFile;
-
   if (InputArgs.hasArg(OPT_out)) {
     OutputFile = InputArgs.getLastArgValue(OPT_out);
   } else if (InputFiles.size() == 1) {
@@ -113,5 +130,27 @@ int main(int argc, const char **argv) {
     reportError("no output file specified");
   }
 
+  WindowsManifestMerger Merger;
+
+  for (const auto &File : InputFiles) {
+    ErrorOr<std::unique_ptr<MemoryBuffer>> ManifestOrErr =
+        MemoryBuffer::getFile(File);
+    if (!ManifestOrErr)
+      reportError(File, ManifestOrErr.getError());
+    MemoryBuffer &Manifest = *ManifestOrErr.get();
+    error(Merger.merge(Manifest));
+  }
+
+  std::unique_ptr<MemoryBuffer> OutputBuffer = Merger.getMergedManifest();
+  if (!OutputBuffer)
+    reportError("empty manifest not written");
+  ErrorOr<std::unique_ptr<FileOutputBuffer>> FileOrErr =
+      FileOutputBuffer::create(OutputFile, OutputBuffer->getBufferSize());
+  if (!FileOrErr)
+    reportError(OutputFile, FileOrErr.getError());
+  std::unique_ptr<FileOutputBuffer> FileBuffer = std::move(*FileOrErr);
+  std::copy(OutputBuffer->getBufferStart(), OutputBuffer->getBufferEnd(),
+            FileBuffer->getBufferStart());
+  error(FileBuffer->commit());
   return 0;
 }