> Is there any benefit outside of gcc compatibility? What are the
> disadvantages? This broadly impacts *all* code that is/will be built with
> -O0 over 1 bad line of code. Someone should make a concise and clear
> decision about at which point compatibility makes sense. This seems like a
> knee jerk decision
>
The main benefit is the ability to build the Linux kernel
at all optimization levels. There are many other contexts
where compile time constants are used in if-then-else
or switch statements. This type of usage has been
quite common on Linux because of the gcc behavior.
We would also get smaller code and faster compile time,
which does not get an error, but leads to code bloat at -O0
Here's another example from /usr/include/math.h
# define signbit(x) \
(sizeof (x) == sizeof (float) \
? __signbitf (x) \
: sizeof (x) == sizeof (double) \
? __signbit (x) : __signbitl (x))
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