On Tue, Dec 07, 2021 at 01:38:34AM +0100, Alejandro Colomar (man-pages) wrote:
> On 12/7/21 00:31, наб wrote:
> > For my own curiosity: which preposition would you use in Spanish here?
> I would say "en" (which normally translates to "in" in English).
>
> Under some circumstances I might use "con" ("with" in English), but it would
> be rarer.
Huh! That's neat, I wouldn't've expected it!
> > Eeeeh, not really? That's functionally identical but, like,
> > very verbose for no good reason.
> Are those defined to actual values? Or are they defined just empty?
> I thought they were empty (but have never used those macros, so don't know
> at all), in which case it would matter:
They're either undefined (=> 0) or defined to a truthy value
(1, realistically, but you see versions in some other APIs).
It'd also be logically valid to define them to 0,
but this is rare because people do define-checks.
A "default" -D macro, like all features are, is 1,
so your test program is more accurately represented as:
-- >8 --
nabijaczleweli@tarta:~/uwu$ cat defined.c
#if A && B
#warning AB
#else
#warning notAB
#endif
#if C && D
#warning CD
#else
#warning notCD
#endif
nabijaczleweli@tarta:~/uwu$ cc -E defined.c > /dev/null
defined.c:4:2: warning: notAB [-W#warnings]
#warning notAB
^
defined.c:10:2: warning: notCD [-W#warnings]
#warning notCD
^
2 warnings generated.
nabijaczleweli@tarta:~/uwu$ cc -DA -DB -E defined.c > /dev/null
defined.c:2:2: warning: AB [-W#warnings]
#warning AB
^
defined.c:10:2: warning: notCD [-W#warnings]
#warning notCD
^
2 warnings generated.
-- >8 --
Which behaves as expected.
Best,
наб
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