On 2026-01-07 09:12, Christos Zoulas via tz wrote:
Hello,
The new tzcode uses static_assert() with no message which is a c2x
extension. clang does not like that by default (without specifying -
std=gnu2x).
/home/source/ab/HEAD-llvm/src/lib/libc/time/private.h:1017:52: error:
'_Static_assert' with no message is a C2x extension [-Werror,-Wc2x-
extensions]
|| TIME_T_MAX >> (TYPE_BIT(time_t) - 2) == 1);
^
, ""
Which clang? I'm not seeing that diagnostic with clang version 20.1.8
(Fedora 20.1.8-4.fc42).
Also, that code appears on line 994 in upstream tzcode, whereas your
diagnostic says line 1017. So I suppose you're using a modified
private.h? The upstream private.h contains this:
/* For pre-C23 compilers, a substitute for static_assert.
Some of these compilers may warn if it is used outside the top
level. */
#if __STDC_VERSION__ < 202311 && !defined static_assert
# define static_assert(cond) extern int static_assert_check[(cond) ? 1 : -1]
#endif
so you might use 'clang -E' to see why that isn't working for you as it
should.
