[PATCH] D137572: [AVR][Clang] Implement __AVR_HAVE_*__ macros

[Ayke via Phabricator via cfe-commits]

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These macros are defined in avr-gcc and are useful when working with assembly.
For example, startup code needs to copy the contents of .data from flash to RAM, but should use elpm (instead of lpm) on devices with more than 64kB flash. Without `__AVR_HAVE_ELPM__`, there is no way to know whether the elpm instruction is supported.

Depends on D137521 <https://reviews.llvm.org/D137521>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137572

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

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