* lisp/org/org-clock.el (org-clock--oldest-date): Only execute
'decode-time' on times later than year -2**31 under macOS 10.6.
See Bug#27706.
(funcall dichotomy
most-negative-fixnum
0
- (lambda (m) (ignore-errors (decode-time (list m 0))))))
+ (lambda (m)
+ ;; libc in macOS 10.6 hangs when decoding times
+ ;; around year -2**31. Limit `high' not to go
+ ;; any earlier than that.
+ (unless (and (eq system-type 'darwin)
+ (string-match-p
+ "10\\.6\\.[[:digit:]]"
+ (shell-command-to-string
+ "sw_vers -productVersion"))
+ (<= m -1034058203136))
+ (ignore-errors (decode-time (list m 0)))))))
(low
(funcall dichotomy
most-negative-fixnum