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| author | Jonathan Wakely <jwakely@redhat.com> | 2020-06-17 20:26:13 +0100 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2020-06-17 20:26:13 +0100 |
| commit | d392babbeb6cb531ab8b1ec68fde9ffd36373a6e (patch) | |
| tree | 0fb1a2e97e30225aa4f459becebb527897e80e2b | |
| parent | 4a31a8add56d49867c187d90b3a89e97634543c2 (diff) | |
| download | gcc-d392babbeb6cb531ab8b1ec68fde9ffd36373a6e.zip gcc-d392babbeb6cb531ab8b1ec68fde9ffd36373a6e.tar.gz gcc-d392babbeb6cb531ab8b1ec68fde9ffd36373a6e.tar.bz2 | |
c++: Fix bogus "does not declare anything" warning (PR 66159)
G++ gives a bogus warning for 'struct A; using B = struct ::A;'
complaining that the elaborated-type-specifier doesn't declare anything.
That's true, but it's not trying to declare struct ::A, just refer to it
unambiguously. Do not emit the warning unless we're actually parsing a
declaration.
gcc/cp/ChangeLog:
PR c++/66159
* parser.c (cp_parser_elaborated_type_specifier): Do not warn
unless in a declaration.
gcc/testsuite/ChangeLog:
PR c++/66159
* g++.dg/warn/forward-inner.C: Check alias-declaration using
elaborated-type-specifier.
| -rw-r--r-- | gcc/cp/parser.c | 3 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/warn/forward-inner.C | 9 |
2 files changed, 10 insertions, 2 deletions
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c index 69839ba..815582c 100644 --- a/gcc/cp/parser.c +++ b/gcc/cp/parser.c @@ -18953,7 +18953,8 @@ cp_parser_elaborated_type_specifier (cp_parser* parser, here. */ if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON) - && !is_friend && !processing_explicit_instantiation) + && !is_friend && is_declaration + && !processing_explicit_instantiation) warning (0, "declaration %qD does not declare anything", decl); type = TREE_TYPE (decl); diff --git a/gcc/testsuite/g++.dg/warn/forward-inner.C b/gcc/testsuite/g++.dg/warn/forward-inner.C index 5336d4e..d7b93f8 100644 --- a/gcc/testsuite/g++.dg/warn/forward-inner.C +++ b/gcc/testsuite/g++.dg/warn/forward-inner.C @@ -70,7 +70,7 @@ template class TC6<int>::TC7; // Valid explicit instantiation, no warning // Verify that friend declarations, also easy to confuse with forward -// declrations, are similarly not warned about. +// declarations, are similarly not warned about. class C8 { public: class C9 { }; @@ -79,3 +79,10 @@ class C10 { public: friend class C8::C9; // Valid friend declaration, no warning }; + +#if __cplusplus >= 201103L +// Verify that alias-declarations using an elaborated-type-specifier and +// nested-name-specifier are not warned about (PR c++/66159). +struct C11; +using A1 = struct ::C11; // Valid alias-decl, no warning +#endif |