On Mon, 1 May 2023 at 21:04, Jonathan Wakely <jwakely@redhat.com> wrote:

>
>
> On Mon, 1 May 2023 at 08:06, Kefu Chai via Libstdc++ <
> libstdc++@gcc.gnu.org> wrote:
>
>> This patch fixes the false alarm when performing the check introduced by
>> bf78b43873b0b7e8f9a430df38749b8b61f9c9b8 . A minimal reproducer can be
>> found at https://godbolt.org/z/7q4nG68xn
>>
>> I am pasting the reproducer here just in case:
>>
>> #include <cstring>
>> #include <string>
>> #include <sstream>
>>
>> int main() {
>>     unsigned char buf[sizeof(std::string)] ;
>>     std::memset(buf, 0xff, sizeof(buf));
>>     const char s[] = "1234567890abcdefg";
>>     std::istringstream in{s};
>>     std::istreambuf_iterator<char> it{in}, end;
>>     auto* p = new (buf) std::string(it, end);
>>     return 0;
>> }
>>
>> Tested on x86_64-pc-linux-gnu, with "make check-target-libstdc++-v3".
>> Would be great if this change can be included in thunk, 13.2 and 12
>> branches.
>>
>
> The bf78b43873b0b7e8f9a430df38749b8b61f9c9b8 change isn't on the gcc-12
> branch.
>

Oh wait, yes it is - I was thinking of another change that I didn't
backport, sorry.


>
>
>> Kefu Chai (1):
>>   libstdc++: Set _M_string_length before calling _M_dispose()
>>
>>  libstdc++-v3/include/bits/basic_string.tcc | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> --
>> 2.40.1
>>
>>