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Port intmax macro to strict C11

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Needed for Apple clang version 14.0.0 (clang-1400.0.29.202).
* src/common.h (intmax): Define macro only if _Generic works, and
use _Generic in it rather that using EXPR_SIGNED.  This is needed
to make the first argument of verify_expr an integer constant
expression, which is required for strict C11.  Although GCC is
smart enough to treat (1 ? 0 : V) as an integer constant
expression even if V is an integer variable, C11 does not require
support for this sort of thing.
This commit is contained in:
Paul Eggert 2025-11-15 00:55:47 -08:00
parent 4e548d150c
commit 0521528cdf
1 changed files with 9 additions and 1 deletions
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10
src/common.h
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@ -683,7 +683,15 @@ intmax (intmax_t n)
}
/* intmax should be used only with signed types.
To bypass this check parenthesize the function, e.g., (intmax) (n). */
#define intmax(n) verify_expr (EXPR_SIGNED (n), (intmax) (n))
#if 201112 <= __STDC_VERSION__ && !_GL__GENERIC_BOGUS
# define intmax(n) \
verify_expr (_Generic (n, \
unsigned char: 0, unsigned short int: 0, \
unsigned int: 0, unsigned long int: 0, \
unsigned long long int: 0, \
default: 1), \
(intmax) (n))
#endif
/* Represent N using a signed integer I such that (uintmax_t) I == N.
With a good optimizing compiler, this is equivalent to (intmax_t) i