GCC in the android NDK is now deprecated.

In https://android.googlesource.com/platform/ndk.git/+/master/CHANGELOG.md

Have that text:
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Changelog

Clang
•PSA: Everyone should be switching to Clang.

GCC
•GCC in the NDK is now deprecated.
•Time to start using Clang if you haven’t already. If you have problems with Clang, please file bugs!
•The NDK will not be upgrading to 5.x, nor will we be accepting non-critical backports.
•Maintenance for miscompiles and internal compiler errors in 4.9 will be handled on a case by case basis.
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But Qt for Android only supports Android ndk's gcc.Not support use Android ndk's clang to build Qt.
Please support Android ndk's clang and prebuilt it.
Thanks.