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# 3e7ad1f2 11-Nov-2021 Chris Bieneman <chris.bieneman@me.com>

Emit final macro diagnostics in system headers

Final macro diagnostics should log from system headers.

As planned, final macros are hard-mode. They always log diagnostics.


# 1e48ef20 27-Sep-2021 Chris Bieneman <chris.bieneman@me.com>

Implement #pragma clang final extension

This patch adds a new preprocessor extension ``#pragma clang final``
which enables warning on undefinition and re-definition of macros.

The intent of this wa

Implement #pragma clang final extension

This patch adds a new preprocessor extension ``#pragma clang final``
which enables warning on undefinition and re-definition of macros.

The intent of this warning is to extend beyond ``-Wmacro-redefined`` to
warn against any and all alterations to macros that are marked `final`.

This warning is part of the ``-Wpedantic-macros`` diagnostics group.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D108567

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