When building `format.cc` as such with GCC 13.2.1:
$ g++ -c format.cc -DFMT_EXCEPTIONS=0 -Wmissing-noreturn -Werror
I get:
In file included from format.cc:8:
fmt/format-inl.h: In function ‘void fmt::v10::detail::assert_fail(const char*, int, const char*)’:
fmt/format-inl.h:30:15: error: function might be candidate for attribute ‘noreturn’ [-Werror=suggest-attribute=noreturn]
30 | FMT_FUNC void assert_fail(const char* file, int line, const char* message) {
| ^~~~~~~~~~~
fmt/format-inl.h: In function ‘void fmt::v10::report_error(const char*)’:
fmt/format-inl.h:129:15: error: function might be candidate for attribute ‘noreturn’ [-Werror=suggest-attribute=noreturn]
129 | FMT_FUNC void report_error(const char* message) {
| ^~~~~~~~~~~~
cc1plus: all warnings being treated as errors
Note that, with `FMT_EXCEPTIONS` defined to 0:
‣ report_error(const char *) uses FMT_THROW() which expands to calling
assert_fail().
‣ assert_fail() calls std::terminate() which has the `[[noreturn]]`
attribute since C++11 [1].
Therefore, with `FMT_EXCEPTIONS` defined to 0, both assert_fail() and
report_error() need to have the `[[noreturn]]` attribute too (if
available). In other words, `FMT_NORETURN` doesn't depend on
`FMT_EXCEPTIONS`.
Also adding `FMT_NORETURN` to two on_error() functions which call
report_error(const char *).
Other report_error() overloads eventually return, therefore they don't
need `FMT_NORETURN`.
[1]: https://en.cppreference.com/w/cpp/error/terminate
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
* Really fix MSVC warning about <bit> only being available in C++20.
The warning states "The contents of <bit> are available only with C++20 or later.",
but the check was for C++17 and later.
* Change <bit> inclusion check per https://github.com/fmtlib/fmt/pull/3832#discussion_r1471144867
Alex Dewar