Comment (by Roland Haas):

There is one other “odd' uses of AC_TRY_XXX in Cactus (not failures like this one thoug in CCTK_CHECK_C_INLINE we have

 AC_TRY_COMPILE(, [} $ac_kw int foo() {], [cctk_cv_c_inline=$ac_kw; break])

which probably would be nicer if it did:

AC_TRY_COMPILE($ac_kw int foo(){return 0;}], [], [cctk_cv_c_inline=$ac_kw; break])

since it does not “trick” autoconf by closing the autoconf created main function with the leading }.

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