Hello, On Wed, 16 Nov 2022, Sam James wrote: > Unrelated but I was a bit tempted to ask for throwing in > -Wbuiltin-declaration-mismatch to default -Werror while Clang 16 was at > it, but I suppose we don't want the world to burn too much, :-) It's IMHO a bug in the standard that it misses "if any of its associated headers are included" in the item for reservation of external linkage identifiers; it has that for all other items about reserved identifiers in the Library clause. If that restriction were added you couldn't justify erroring on the example at hand (because it doesn't include e.g. <stdio.h> and then printf wouldn't be reserved). A warning is of course always okay and reasonable. As is, you could justify erroring out, but I too think that would be overzealous. Ciao, Michael.
