[PATCH] D34249: [libc++] Don't use UTIME_OMIT to detect utimensat on Apple

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith added inline comments.


================
Comment at: src/experimental/filesystem/operations.cpp:22-24
+#if defined(__APPLE__)
+#include <Availability.h>
+#endif
----------------
EricWF wrote:
> dexonsmith wrote:
> > I only just noticed you were including Availability.h.  That shouldn't be necessary, since the macros should be defined by the compiler.
> __MAC_10_13 et al are defined in `Availability.h`, and `AvailabilityInternal.h` seems to do the `__ENV` dance described above. Are you sure it's not needed?
I don't think the dance is necessary, since libcxx won't be overriding those macros.

Also, we can skip the `__MAC_10_13` macros, ala src/chrono.cpp.


https://reviews.llvm.org/D34249