[cfe-dev] [libc++]

[Vedant Kumar via cfe-dev]

I have only come across reports of -fsanitize=object-size violations in libcxx, never alignment issues. However, this is a fairly old version of libc++, and the issues may have been fixed already.

Tobias, can you provide instructions on how to reproduce this issue?

vedant


> On Feb 13, 2017, at 8:33 AM, Mehdi Amini via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> Hi,
> 
> There use to be known UBSAN failures in libc++, they have been fixed as of now AFAIK (most in 3.9).
> 
> Best,
> 
> — 
> Mehdi
> 
>> On Feb 13, 2017, at 6:56 AM, Tobias Markus via cfe-dev <cfe-dev at lists.llvm.org> wrote:
>> 
>> Hi,
>> 
>> compiling a C++ application with UBSan enabled, I get a couple of
>> alignment-related errors from UBSan on std::map-related functions. The
>> map is of type std::map<int, std::function<void()>>.
>> 
>> Relevant messages: https://gist.github.com/hesiod/3f978eace168609af37a2
>> 1ca26e7adc0
>> 
>> This occured with libc++ 3.8.0 and clang/llvm 3.9.1 on Arch Linux.
>> 
>> Tobias
>> 
>> PS: Please make sure to include me in all replies since I am not
>> subscribed to cfe-dev.
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