[Bug c++/53431] C++ preprocessor ignores #pragma GCC diagnostic

[nbkolchin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53431

--- Comment #38 from Nickolay Kolchin-Semyonov <nbkolchin at gmail dot com> ---
Since this is a long standing problem, maybe this limitation should be
mentioned in official documentation?