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On 15/03/2024 04:44, Keith Thompson wrote:
> Kaz Kylheku <433-929-6894@kylheku.com> writes:
> [...]
>>>> #if defined __GNUC__ && __GNUC__ >= 2
>>
>> Whoever wrote this didn't know that if __GNUC__ doesn't exist, it will
>> expand as 0, which is false, so this is equivalent to just
>>
>>    #if __GNUC__ >= 2
> 
> Or they did know that and decided that the longer version would be clearer.
> 

Or they did know, and decided they did not want a spurious warning when 
compiling with "-Wundef" that generates a warning before replacing 
undefined identifiers with 0 in #if directives.  Personally, I always 
use -Wundef in my own code, because I think the "default to 0" treatment 
makes it far too easy for typos to go unnoticed.  I have no idea if the 
glibc folk agree with that and like to use -Wundef themselves, or if 
they just like to make their code as "warning-proof" as possible.