Swift (swift-lang) absolutely, positively requires clang. I tried building Swift with gcc and that is a lost weekend I’d love to get back.

Ron

On 23 Apr 2021, at 14:46, Florian Weimer wrote:

* Gary Buhrmaster:

For C/C++ projects:

If the upstream has no stated preference for the compiler, the
   packager SHOULD use the system default compiler (i.e. GCC).

If the upstream specifies a preference, in their documentation,
   build, or support processes, the packager SHOULD follow
   the direction of the upstream.

Are there any upstreams that specify a preference for Clang in general?

Usually it's a specific binary build of Clang, or maybe a source build
with certain patches applied (and that is downloaded and built the first
time the project is built, as some sort of bootstrapping step).

So it's not so much “use Clang”, but “use our compiler, not the system
compiler”.

Thanks,
Florian
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