[PATCH] D137521: [AVR][Clang] Implement __AVR_ARCH__ macro

[Ayke via Phabricator via cfe-commits]

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This macro is defined in avr-gcc, and is very useful especially in assembly code to check whether particular instructions are supported. It is also the basis for other macros like `__AVR_HAVE_ELPM__`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137521

Files:
  clang/lib/Basic/Targets/AVR.cpp
  clang/lib/Basic/Targets/AVR.h
  clang/test/Preprocessor/avr-atmega328p.c
  clang/test/Preprocessor/avr-attiny104.c

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