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authorMarek Polacek <polacek@redhat.com>2022-04-28 16:50:06 -0400
committerMarek Polacek <polacek@redhat.com>2022-04-29 15:07:57 -0400
commitfd0d3e9121c5aa65150d242676be6bbdc8d4a92a (patch)
tree12f441f0f0de04633a08e1d00e26d6988b6c19a0 /gcc
parent8d0fcf135857869f7cff36d29bc3527c482372a9 (diff)
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c++: pedwarn for empty unnamed enum in decl [PR67048]
[dcl.dcl]/5 says that enum { }; is ill-formed, and since r197742 we issue a pedwarn. However, the pedwarn also fires for enum { } x; which is well-formed. So only warn when {} is followed by a ;. This should be correct since you can't have "enum {}, <whatever>" -- that produces "expected unqualified-id before ',' token". PR c++/67048 gcc/cp/ChangeLog: * parser.cc (cp_parser_enum_specifier): Warn about empty unnamed enum only when it's followed by a semicolon. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/enum42.C: New test.
Diffstat (limited to 'gcc')
-rw-r--r--gcc/cp/parser.cc4
-rw-r--r--gcc/testsuite/g++.dg/cpp0x/enum42.C7
2 files changed, 10 insertions, 1 deletions
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index ee69934..a5cbb3e 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -21012,7 +21012,9 @@ cp_parser_enum_specifier (cp_parser* parser)
/* If the next token is not '}', then there are some enumerators. */
else if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_BRACE))
{
- if (is_unnamed && !scoped_enum_p)
+ if (is_unnamed && !scoped_enum_p
+ /* Don't warn for enum {} a; here. */
+ && cp_lexer_nth_token_is (parser->lexer, 2, CPP_SEMICOLON))
pedwarn (type_start_token->location, OPT_Wpedantic,
"ISO C++ forbids empty unnamed enum");
}
diff --git a/gcc/testsuite/g++.dg/cpp0x/enum42.C b/gcc/testsuite/g++.dg/cpp0x/enum42.C
new file mode 100644
index 0000000..05b372a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/enum42.C
@@ -0,0 +1,7 @@
+// PR c++/67048
+// { dg-do compile { target c++11 } }
+// { dg-options -Wpedantic }
+
+typedef enum {} X;
+enum {} x;
+enum {} y, z;