sntp/crypto.c includes sntp/config.h, then sntp/crypto.h which includes
ntp_stdlib.h which in turn includes l_stdlib.h that contains
#ifndef HAVE_MEMCHR
extern void *memchr(const void *s, int c, size_t n);
#endif
and breaks the build with glibc 2.43.
sntp/config.h does not contain any information about memchr() while the
top-level config.h does but this top-level config.h is not included
because sntp/Makefile lacks -I$(top_builddir) so sntp/config.h gets
included which does not define HAVE_MEMCHR although glibc does provide
memchr() but sntp/configure lacks a check for memchr().
This was not a problem with previous glibc versions but due to recent
C23 changes in glibc the ntp build is now broken.
To fix the problem we add a configure check for memchr() to
sntp/configure so HAVE_MEMCHR gets defined in sntp/config.h.
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Bernd Kuhls
eb5086ae7a