[Bug c++/116332] -O2 makes c++ std::regex give zero-alloc warnings

[junxuan_liao at outlook dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116332

--- Comment #1 from Junxuan Liao <junxuan_liao at outlook dot com> ---
Created attachment 58902
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58902&action=edit
preprocessed source