dexonsmith added inline comments.
================
Comment at: src/experimental/filesystem/operations.cpp:23-28
+// We can use the presence of UTIME_OMIT to detect platforms that do not
+// provide utimensat, with some exceptions on OS X.
+#if !defined(UTIME_OMIT) || \
+ (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) &&
__MAC_OS_X_VERSION_MIN_REQUIRED < 1030)
+#define _LIBCPP_HAS_NO_UTIMENSAT
+#endif
----------------
dexonsmith wrote:
> EricWF wrote:
> > dexonsmith wrote:
> > > Sadly this isn't quite sufficient. As per Jack's suggested SDK patch in
> > > the PR, we need to enumerate the platforms :/. I think this should be
> > > the right logic for the four Darwin platforms:
> > >
> > > (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) &&
> > > __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_11_0) || \
> > > (defined(__WATCH_OS_VERSION_MIN_REQUIRED) &&
> > > __WATCH_OS_VERSION_MIN_REQUIRED < __WATCHOS_4_0) || \
> > > (defined(__TV_OS_VERSION_MIN_REQUIRED) &&
> > > __TV_OS_VERSION_MIN_REQUIRED < __TVOS_11_0) || \
> > > (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) &&
> > > __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_13)
> > >
> > Do we have to do the below dance for all of those macros?
> >
> > ```
> > #if !defined(__FOO_VERSION_MIN_REQUIRED) &&
> > defined(__ENVIROMENT_FOO_VERSION_MIN_REQUIRED)
> > #define __FOO_VERSION_MIN_REQUIRED __ENVIROMENT_FOO_VERSION_REQUIRED
> > #endif
> > ```
> Nope. I just advised you to use the wrong ones. Use the `__ENVIRONMENT`
> versions pre-defined by Clang.
Specifically:
```
clang/lib/Basic/Targets.cpp:183:
Builder.defineMacro("__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__", Str);
clang/lib/Basic/Targets.cpp:185:
Builder.defineMacro("__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__",
clang/lib/Basic/Targets.cpp:197:
Builder.defineMacro("__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__", Str);
clang/lib/Basic/Targets.cpp:221:
Builder.defineMacro("__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__", Str);
```
https://reviews.llvm.org/D34249
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