Comment (by Roland Haas):

The current code works for me (e.g. on the Delta Cluster at UIUC, and also on Summit). I get:

/* Timing stuff */
#define HAVE_TIME_GETTIMEOFDAY 1
#define GETTIMEOFDAY_NEEDS_TIMEZONE 1
#define HAVE_TIME_GETRUSAGE 1

in cctk_Config.h for both. On my M1 based macOS testing system with Homebrew it does indeed fail:

/* Timing stuff */
/* #undef HAVE_TIME_GETTIMEOFDAY */
/* #undef GETTIMEOFDAY_NEEDS_TIMEZONE */
#define HAVE_TIME_GETRUSAGE 1

So, since we have just entered code freeze for the release in May, I would not want to touch anything in configure if possible. While the change looks harmless, and indeed:

#include <sys/time.h>
int main(void) {
  gettimeofday(0,0);
  return 0;
}

is much nicer code (and closer to how the actual arguments to TRY_LINK are defined) than

int main(void) {
  #include <sys/time.h>
  gettimeofday(0,0);
  --

Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2721/cactus-does-not-detect-gettimeofday-timer