[PATCH] Fix parser to recognize operator?:

[Matthias Kretz]

This is a minor bugfix for improved error reporting. Overloading ?: is just as 
disallowed as it is without this change.

2019-10-11  Matthias Kretz  <m.kr...@gsi.de>

        * gcc/cp/parser.c (cp_parser_operator): Parse operator?: as an
          attempt to overload the conditional operator. Then
          grok_op_properties can print its useful "ISO C++ prohibits
          overloading operator ?:" message instead of the cryptic error
          message about a missing type-specifier before '?' token.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 3ee8da7db94..73385cb3dcb 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -15502,6 +15502,15 @@ cp_parser_operator (cp_parser* parser, location_t 
start_loc)
       op = COMPONENT_REF;
       break;
 
+    case CPP_QUERY:
+      op = COND_EXPR;
+      /* Consume the `?'.  */
+      cp_lexer_consume_token (parser->lexer);
+      /* Look for the matching `:'.  */
+      cp_parser_require (parser, CPP_COLON, RT_COLON);
+      consumed = true;
+      break;
+
     case CPP_OPEN_PAREN:
       {
         /* Consume the `('.  */

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 Dr. Matthias Kretz                           https://mattkretz.github.io
 GSI Helmholtzzentrum für Schwerionenforschung             https://gsi.de
 SIMD easy and portable                     https://github.com/VcDevel/Vc
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