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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/106111] -Wc++20-compat doesn't warn about using `requires` as an identifier Date: Tue, 28 Jun 2022 09:53:25 +0000 [thread overview] Message-ID: <bug-106111-4-6Ivth8V5sf@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-106111-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106111 --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Oh, that's because -Wc++20-compat doesn't include -Wc++17-compat etc. With the right options GCC warns about three: $ g++ -std=c++03 r.C -c -Wc++20-compat -Wc++11-compat -Wc++14-compat -Wc++17-compat r.C:1:5: warning: identifier ‘decltype’ is a keyword in C++11 [-Wc++11-compat] 1 | int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; | ^~~~~~~~ r.C:1:15: warning: identifier ‘constexpr’ is a keyword in C++11 [-Wc++11-compat] 1 | int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; | ^~~~~~~~~ r.C:1:47: warning: identifier ‘noexcept’ is a keyword in C++11 [-Wc++11-compat] 1 | int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; | ^~~~~~~~ We're missing warnings for alignof and alignas in C++11, and consteval and requires in C++20. Clang warns about them all: $ clang++ -std=c++03 r.C -c -Wc++20-compat -Wc++11-compat -Wc++14-compat -Wc++17-compat r.C:1:5: warning: 'decltype' is a keyword in C++11 [-Wc++11-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ r.C:1:15: warning: 'constexpr' is a keyword in C++11 [-Wc++11-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ r.C:1:26: warning: 'consteval' is a keyword in C++20 [-Wc++20-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ r.C:1:37: warning: 'requires' is a keyword in C++20 [-Wc++20-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ r.C:1:47: warning: 'noexcept' is a keyword in C++11 [-Wc++11-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ r.C:1:57: warning: 'alignof' is a keyword in C++11 [-Wc++11-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ r.C:1:66: warning: 'alignas' is a keyword in C++11 [-Wc++11-compat] int decltype, constexpr, consteval, requires, noexcept, alignof, alignas; ^ 7 warnings generated.
next prev parent reply other threads:[~2022-06-28 9:53 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-28 9:48 [Bug c++/106111] New: " redi at gcc dot gnu.org 2022-06-28 9:51 ` [Bug c++/106111] " redi at gcc dot gnu.org 2022-06-28 9:53 ` redi at gcc dot gnu.org [this message] 2022-06-28 12:16 ` mpolacek at gcc dot gnu.org 2022-06-28 12:20 ` mpolacek at gcc dot gnu.org 2022-06-28 12:24 ` mpolacek at gcc dot gnu.org 2022-07-01 15:11 ` cvs-commit at gcc dot gnu.org 2022-07-01 15:20 ` mpolacek at gcc dot gnu.org 2022-10-22 2:22 ` pinskia at gcc dot gnu.org
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