[LyX/master] Cmake build: Start demanding at least version 5.1 if compiling with gcc

[Jean-Marc Lasgouttes]

Le 04/11/2024 à 18:29, Jean-Marc Lasgouttes a écrit :
> Le 25/10/2024 à 08:23, Pavel Sanda a écrit :
>> Googling around
>> 16.04 has Qt 5.5.1 & Python 3.5 & gcc 5.4 available even if not default.
>> 18.04 has Qt 5.9.5 & Python 3.6 & gcc 7.5 available
>>
>> We did unnecessarily drastic cut.
>> We can require gcc 7 only, but I think you just killed support Qt 
>> 5.9.5 anyway?
> 
> With my latest commits, we now support Ubuntu 18.04, which actually has 
> python 3.8 in its repositories.
> 
> Everything compiles fine with gcc 7 and Qt 5.9.5.

Kornel, I did not modify CMake stuff for the Qt version (and I do not 
know whether CMake 3.10, which is available with Ubuntu 18.04 is good 
enough for 2.5.

JMarc