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Yee Cheng Chin aebdca4339 Fix legacy builds crashing in 10.9-10.11 by disabling clock_gettime

Recent Vim builds introduced the use of clock_gettime(), which on macOS
was only introduced in 10.12. In Vim, we added a configure check to
detect its existence (https://github.com/vim/vim/issues/12242) but it
only works to detect the build-time environment. For MacVim builds we
build on new machines but deploy on old machines by using
MACOSX_DEPLOYMENT_TARGET=10.9 when building. This means that the
configure script will detect clock_gettime() exists and includes it, but
at runtime the app will crash when running MacVim (legacy builds) in
10.9-10.11.

To fix this, add explicit checks to make sure we undef
HAVE_CLOCK_GETTIME if deployment target is below 10.12. Unfortunately
there isn't really a way to detect such things automatically in a
configure script as it requires knowledge of historical releases.

2023-07-06 01:17:00 -07:00