ProfileData: Add support for the indexed instrprof format

This adds support for an indexed instrumentation based profiling
format, which is just a small header and an on disk hash table.  This
format will be used by clang's -fprofile-instr-use= for PGO.

llvm-svn: 206656

1 files changed, 4 insertions, 5 deletions

diff --git a/llvm/tools/llvm-profdata/llvm-profdata.cpp b/llvm/tools/llvm-profdata/llvm-profdata.cpp
index 397b523..0bd8e83 100644
--- a/llvm/tools/llvm-profdata/llvm-profdata.cpp
+++ b/llvm/tools/llvm-profdata/llvm-profdata.cpp
@@ -39,16 +39,15 @@ int merge_main(int argc, const char *argv[]) {
   cl::opt<std::string> OutputFilename("output", cl::value_desc("output"),
                                       cl::init("-"),
                                       cl::desc("Output file"));
-  cl::alias OutputFilenameA("o", cl::desc("Alias for --output"),
-                                 cl::aliasopt(OutputFilename));
+  cl::alias OutputFilenameA("o", cl::desc("Alias for --output"), cl::Required,
+                            cl::aliasopt(OutputFilename));
 
   cl::ParseCommandLineOptions(argc, argv, "LLVM profile data merger\n");
 
-  if (OutputFilename.empty())
-    OutputFilename = "-";
+  if (OutputFilename.compare("-") == 0)
+    exitWithError("Cannot write indexed profdata format to stdout.");
 
   std::string ErrorInfo;
-  // FIXME: F_Text would be available if line_iterator could accept CRLF.
   raw_fd_ostream Output(OutputFilename.data(), ErrorInfo, sys::fs::F_None);
   if (!ErrorInfo.empty())
     exitWithError(ErrorInfo, OutputFilename);