[PATCH] Better macro error messages involving initializer lists

[Richard Smith]

================
Comment at: lib/Lex/PPMacroExpansion.cpp:482
@@ +481,3 @@
+
+        // If the argument starts with a brace, 
+        if (FoundSeparatorToken && ArgStartIterator->is(tok::l_brace)) {
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Incomplete comment.

================
Comment at: lib/Lex/PPMacroExpansion.cpp:443
@@ +442,3 @@
+  unsigned Braces = 0;
+  unsigned Parens = 0;
+
----------------
This variable seems to be unused.

================
Comment at: lib/Lex/PPMacroExpansion.cpp:693-696
@@ +692,6 @@
+                 diag::note_init_list_at_beginning_of_macro_argument);
+        for (SmallVector<SourceRange, 4>::iterator
+                 Range = InitLists.begin(), RangeEnd = InitLists.end();
+                 Range != RangeEnd; ++Range)
+          DB << *Range; 
+      }
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It looks like DiagnosticBuilder will assert if given more than 10 ranges. Maybe guard this with DB.hasMaxRanges()?

================
Comment at: lib/Lex/PPMacroExpansion.cpp:704-709
@@ +703,8 @@
+    DiagnosticBuilder DB = Diag(MacroName, diag::note_suggest_parens_for_macro);
+    for (SmallVector<SourceRange, 4>::iterator
+             ParenLocation = ParenHints.begin(), ParenEnd = ParenHints.end();
+         ParenLocation != ParenEnd; ++ParenLocation) {
+      DB << FixItHint::CreateInsertion(ParenLocation->getBegin(), "(")
+         << FixItHint::CreateInsertion(ParenLocation->getEnd(), ")");
+    }
+    ArgTokens.swap(FixedArgTokens);
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Likewise w/fixits.

================
Comment at: test/Preprocessor/macro_with_initializer_list.cpp:140
@@ +139,3 @@
+// make it no longer an initializer list.
+// TODO: Add note for initializer list at beginning of macro argument.
+void test() {
----------------
This is done, right?


http://llvm-reviews.chandlerc.com/D986