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doc: Clang 8 or later is required with FORCE_USE_SYSTEM_CLANG

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The usage of pragmas within the macOS SDK requires LLVM Clang 8. This is
the version as our prebuilt Clang, however the minimum is worth noting here
as they may diverge and/or expert users might expect they could use an
earlier version.

If you compile using Clang 7 you'll see output like:
```bash
In file included from kernel/qcore_mac_objc.mm:44:
In file included from /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSText.h:9:
In file included from /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSView.h:19:
In file included from /bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSResponder.h:10:
/bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/System/Library/Frameworks/AppKit.framework/Headers/NSEvent.h:19:1: error:
      expected 'push' or 'pop' after '#pragma clang attribute'
/bitcoin/depends/SDKs/Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers/usr/include/os/availability.h:104:273: note: expanded from macro
      'API_UNAVAILABLE_BEGIN'
  ...__API_UNAVAILABLE_BEGIN5, __API_UNAVAILABLE_BEGIN4, __API_UNAVAILABLE_BEGIN3, __API_UNAVAILABLE_BEGIN2, __API_UNAVAILABLE_BEGIN1, 0)(__VA_A...
                                                                                                             ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
```
pull/764/head
fanquake 4 years ago
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commit e60ef21b8a
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depends/README.md
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@ -110,9 +110,9 @@ The following can be set when running make: `make FOO=bar`
<dt>BUILD_ID_SALT</dt>
<dd>Optional salt to use when generating build package ids</dd>
<dt>FORCE_USE_SYSTEM_CLANG</dt>
<dd>(EXPERTS ONLY) When cross-compiling for macOS, use clang found in the
system's <code>$PATH</code> rather than the default prebuilt release of clang
from llvm.org</dd>
<dd>(EXPERTS ONLY) When cross-compiling for macOS, use Clang found in the
system's <code>$PATH</code> rather than the default prebuilt release of Clang
from llvm.org. Clang 8 or later is required.</dd>
</dl>
If some packages are not built, for example `make NO_WALLET=1`, the appropriate

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