Re: [PATCH 1/1] Stop using legacy -ffat-lto-objects flag

[Andrea Corallo]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Evan Klitzke <evan@eklitzke.org>
>> Date: Sun, 08 Nov 2020 12:05:28 -0800
>> 
>> Currently when Emacs is configured using the 
>> --enable-link-time-optimization configure flag, the build will use the 
>> -ffat-lto-objects flag if the host compiler is GCC (but not Clang). 
>> According to the comments in configure.ac this is to work around an 
>> issue with LTO builds in GCC 4.9.0. This flag makes builds take much 
>> longer (and produces much larger object files), so I suggest removing it 
>> as GCC 4.x is quite old at this point and doesn't have great LTO support 
>> anyway.
>
> I think this is too soon: fencepost.gnu.org, which runs Trisquel LTS,
> still has GCC 4.8.4.
>
> Thanks.

Couldn't we check and decide based on the GCC version?  IIUC we already
do something like this using gl_GCC_VERSION_IFELSE.

  Andrea