Re: CFT: snmalloc as libc malloc (the source_location issue)

On 10 Feb 2023, at 21:34, Mark Millard <marklmi@yahoo.com> wrote:
> 
> # find / -name source_location -print | more
> /usr/obj/DESTDIRs/main-amd64-chroot/usr/local/lib/gcc12/include/c++/experimental/source_location
> /usr/obj/DESTDIRs/main-amd64-chroot/usr/local/lib/gcc12/include/c++/source_location
> /usr/local/lib/gcc12/include/c++/experimental/source_location
> /usr/local/lib/gcc12/include/c++/source_location
> 
> So, none for FreeBSD and its llvm15.
> 
> This makes sense, https://libcxx.llvm.org/Status/Cxx20.html shows:
> 
> P1208R6 LWG Adopt source_location for C++20 Cologne Complete 16.0
> 
> So, likely FreeBSD will not have this until it progresses to
> LLVM16 . It just changed to LLVM15 in main [so: FreeBSD 14].

The include of source_location is guarded under an #if __has_include, it should be used only if it exists.  If it doesn’t, there’s a stub implementation.  If you have GCC includes in your include path, is it possible that it’s finding a source_location that is then guarded behind a check for a compiler builtin that clang doesn’t have?

David