A code modification hint for files that don't end in a newline.

Eventually, would be nice to be able to run these modifications even
when we don't want the warning or errors for the actual diagnostic.

llvm-svn: 68272

clang/lib/Lex/Lexer.cpp

@@ -1224,7 +1224,9 @@ bool Lexer::LexEndOfFile(Token &Result, const char *CurPtr) {
   // C99 5.1.1.2p2: If the file is non-empty and didn't end in a newline, issue
   // a pedwarn.
   if (CurPtr != BufferStart && (CurPtr[-1] != '\n' && CurPtr[-1] != '\r'))
-    Diag(BufferEnd, diag::ext_no_newline_eof);
+    Diag(BufferEnd, diag::ext_no_newline_eof)
+      << CodeModificationHint::CreateInsertion(getSourceLocation(BufferEnd),
+                                               "\n");
   
   BufferPtr = CurPtr;
 

clang/test/Lexer/fixit-errors.c

@@ -0,0 +1,13 @@
+// RUN: clang-cc -fsyntax-only -pedantic -fixit %s -o - | clang-cc -pedantic -Werror -x c -
+
+/* This is a test of the various code modification hints that are
+   provided as part of warning or extension diagnostics. Eventually,
+   we would like to actually try to perform the suggested
+   modifications and compile the result to test that no warnings
+   remain. */
+// FIXME: If you put a space at the end of the line, it doesn't work yet!
+char *s = "hi\
+there";
+
+// The following line isn't terminated, don't fix it.
+int i; // expected-error{{no newline at end of file}}