"'arm_neon.h' file not found"

On macOS. Either ARM Mac, or iOS target, or ARM Android target:

When including Qt headers that implicitly include "qsimd.h", like including <QtCore> or <QtTest>, Clangd complains that 'arm_neon.h' is not found, potentially resulting in follow-up code model issues.

'arm_neon.h' is part of the Clang installation in /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/include/arm_neon.h

It is not included in our shipped Clang headers.

Workarounds:

• copying arm_neon.h from Xcode into our clang resources folder
• editing compile_commands.json to have "-isystem", "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/include" as the last system include