bug#46983: 28.0.50; [feature/native] Allow .el files to specify non-default values for native-compilation options

[Andrea Corallo via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andrea Corallo <akrl@sdf.org>
>> Cc: Eli Zaretskii <eliz@gnu.org>, 46983@debbugs.gnu.org
>> Date: Sun, 07 Mar 2021 19:35:01 +0000
>> 
>> Okay dbdc44db15 should allow for `comp-native-driver-options' as
>> file-local to be captured correctly.
>
> Thanks.
>
>> I've only added 'gcc_jit_context_add_driver_option' to GCC 9 so we have
>> to decide what to do when this is not available on older GCC.
>> 
>> Till today we raised an error as the use of `comp-native-driver-options'
>> was a deliberate user choice and it's effectiveness was testable with
>> `comp-native-driver-options-effective-p', but if this becomes part of
>> source code we should probably transition to a warining? WDYT?
>
> I'd say, if this is set in file-local variables, just ignore the
> setting if it cannot be applied.  Is this possible to ignore it in
> file-local vars, but still signal an error if customized?

Right we can handle the two cases separately, doing it.

  Andrea