Re: fixing AC_OPENMP for Apple clang

On Mon, 2 Mar 2026 at 22:48, Dima Pasechnik <[email protected]> wrote:

> On Mon, Mar 02, 2026 at 09:45:35PM +0200, Andrew W. Nosenko wrote:
> >
> > Does modern Xcode includes libomp =E2=80=9Cout of the box=E2=80=9D or i=
t need to be built
> > separately from Homebrew/MacPorts/Git? (I have access to Catalina bot n=
ot
> > to more modern version, and on Catalina it doesn=E2=80=99t)
> No, Xcode has no libomp. But Homebrew has a libomp package:
> https://formulae.brew.sh/formula/libomp
>
> It's also provided by R Project:
> https://mac.r-project.org/openmp/
>
> And, yes, naturally, one can build libomp as a part of the llvm
> installation.
>


But then I=E2=80=99m confused again: if I need to build libomp separately f=
rom LLVM
sources, then why I would to prefer XCode=E2=80=99s Clang instead of Clang =
from the
same LLVM package, from which I=E2=80=99m going to build libomp anyway?