Re: [lmi] UBSAN flags

[Greg Chicares]

On 6/7/22 01:04, Vadim Zeitlin wrote:
> On Mon, 6 Jun 2022 23:46:41 +0000 Greg Chicares <gchicares@sbcglobal.net> 
> wrote:
> 
> [...compilation error with -O3...]
[...]
> GC> Dare we consider the possibility that UBSan is malfunctioning?
> 
>  I think it's a compiler bug, not UBSAN's, but somehow it's only triggered
> by the latter. FWIW it still compiles with ASAN and it also compiles with
> UBSAN when using clang.

Thanks: strong evidence that it's a false positive with gcc -O3.

>  BTW, compiling this single source file with -O3 takes 15 seconds on my
> machine with g++-12, which is even slower than the already not great 14s
> with g++-11.

That seems to fit the general trend, and 15s vs. 14s isn't awful.

> amazingly, fails to compile with yet another
> warning (-Wmaybe-uninitialized this time) with g++-12.

If you see legitimate warnings with g++-12, I'd be happy to fix
them now.