warning: unknown warning option '-Wno-deprecated-copy'

[Stephan Witt]

Am 09.10.2020 um 12:18 schrieb Jean-Marc Lasgouttes <lasgouttes at lyx.org>:
> 
> [reply on lyx-devel, since this is not something I 100% understand]
> 
> Le 08/10/2020 à 09:32, racoon a écrit :
>> I am getting lots of
>> warning: unknown warning option '-Wno-deprecated-copy'; did you mean
>> '-Wno-deprecated'?
>>       [-Wunknown-warning-option]
>> I have
>> % clang --version
>> Apple clang version 11.0.3 (clang-1103.0.32.62)
>> I guess this is due to change set 24fb0ff8ef: Use -Wno-deprecated-copy
>> also with clang++ 11
>> Am I missing some setting or is there something wrong with the commit?
> 
> Hi Daniel,
> 
> I think the issue is: are there differences between clang 11 and apple clang 11 ? Or worse, do they have anything in common. I know apple clang numbering used to be ugly, but I thought these days were gone.
> 
> So this seems to tell me that apple clang does not handle this warning -Wdeprecated-copy. Do you have warnings when you revert the commit above?
> 
> Where do I get the list of warning options in apple clang? All I found is a meager "user guide".
> 
> I guess I have to improve autoconf to detect this particular version too.
> 
> Did you have warnings with apple clang 10? The warning was already used there.

Sorry, I cannot answer your questions. But I have the same problem.

What do you think of the attached patch? It tests the compiler behavior instead of relying on the version.

With Apple clang on missing -Wno-deprecated-copy support it works.

Stephan
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