add an assertion requested on llvmdev.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97769 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 25c3fbdef32a1eb95034517ecaecd19c1de8f759..071c924d91952f1a50d74025dc187d5cc58f82ec 100644 (file)
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -368,6 +368,7 @@ void format_object_base::home() {
 /// if no error occurred.
 raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
                                unsigned Flags) : pos(0) {
+  assert(Filename != 0 && "Filename is null");
   // Verify that we don't have both "append" and "excl".
   assert((!(Flags & F_Excl) || !(Flags & F_Append)) &&
          "Cannot specify both 'excl' and 'append' file creation flags!");