Problems building rsync with Clang 15 beta

[Paul Eggert]

[Resending because the rsync mailing list rejected my email earlier.]

On 8/17/22 23:58, Khem Raj wrote:
> rsync which add -pedantic-errors option to cflags during configure


OK, that's the problem then. 'configure' should not use flags like 
-pedantic-errors. This has long been a property of 'autoconf'-generated 
scripts.

The simplest way to fix this would be for rsync to not add 
-pedantic-errors, as it's more trouble than it's worth. But if rsync 
must add -pedantic-errors for some reason, it should do so at the very 
end of 'configure', as in the attached untested patch, so as not to 
screw up earlier 'configure' tests; and perhaps it'd be better for rsync 
to also add -pedantic-errors only for GCC not Clang (since Clang is more 
likely to mutate further in this area).

Really, though, omitting -pedantic-errors entirely is the way to go. 
-pedantic-errors should be enabled only for special purposes, by 
explicit request of the person running 'configure' and/or 'make'; it's 
not suitable as a default option.

Anyway, Khem, please give this rsync patch a try. I'll cc it to the 
rsync mailing list to give rsync developers a heads-up about the 
compatibility problem building rsync with Clang 15 (which luckily does 
not exist yet :-).
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