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2019 Mar 08
2
8.0 Regression with __builtin_constant_p.
...r use `__builtin_constant_p` to implement C++17
`std::char_traits` [4]. This means that any usage of `std::string_view` in
a constant expression has the possibility to break. `__builtin_constant_p`
may be rare, but `std::string_view` is not.
This regression was first found because it breaks `absl::StrFormat` [4].
This bug will break Abseil's LTS w/ libstdc++. Abseil cannot fully work
around this bug.
I would implore us to fix this bug in the upcoming 8 release.
/Eric
[1] https://reviews.llvm.org/D59038
[2] https://godbolt.org/z/VOCCJF
[3] https://github.com/abseil/abseil-cpp/issues/271
[4]
http...
2019 Mar 08
2
[cfe-dev] 8.0 Regression with __builtin_constant_p.
...+17
>> `std::char_traits` [4]. This means that any usage of `std::string_view` in
>> a constant expression has the possibility to break. `__builtin_constant_p`
>> may be rare, but `std::string_view` is not.
>>
>> This regression was first found because it breaks `absl::StrFormat` [4].
>> This bug will break Abseil's LTS w/ libstdc++. Abseil cannot fully work
>> around this bug.
>>
>> I would implore us to fix this bug in the upcoming 8 release.
>>
>> /Eric
>>
>> [1] https://reviews.llvm.org/D59038
>> [2] https://god...