[PATCH 04/11 v3] libstdc++: Make use of __builtin_bit_cast

[Jakub Jelinek]

On Thu, Jun 24, 2021 at 03:40:09PM +0100, Jonathan Wakely wrote:
> On Thu, 24 Jun 2021 at 15:34, Jonathan Wakely wrote:
> > Rather than use the _GLIBCXX_HAS_BUILTIN macro more widely, I'd prefer
> > to not use it where it isn't needed, as in the attached (untested)
> > patch.
> 
> My rationale for this is that I'd prefer to use standardized features
> like __has_include and __has_cpp_attribute where possible, instead of
> adding more and more configure macros. You don't need to look in
> c++config.h to see how the macro is defined if you just use a standard
> feature directly.
> 
> __has_builtin obviously isn't standardized, but as long as it's
> available on all the compilers we care about (which it is) then the
> same rationale applies.

Okay.

	Jakub