[PATCH] D54334: [AVR] Automatically link CRT and libgcc from the system avr-gcc

[Dylan McKay via Phabricator via cfe-commits]

dylanmckay created this revision.
dylanmckay added reviewers: aaron.ballman, kparzysz, asb, hfinkel.

This patch modifies the AVR toolchain so that if avr-gcc and avr-libc
are detected during compilation, the CRT, libgcc, libm, and libc anre
linked.

This matches avr-gcc's default behaviour, and the expected behaviour of
all C compilers - including the C runtime.

avr-gcc also needs a -mmcu specified in order to link runtime libraries.

The difference betwen this patch and avr-gcc is that this patch will
warn users whenever they compile without a runtime, as opposed to GCC,
which silently trims the runtime libs from the linker arguments when no
-mmcu is specified.


Repository:
  rC Clang

https://reviews.llvm.org/D54334

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  include/clang/Basic/DiagnosticGroups.td
  lib/Driver/ToolChains/AVR.cpp
  lib/Driver/ToolChains/AVR.h
  lib/Driver/ToolChains/Gnu.cpp
  test/Driver/avr-link-mcu-family-unimplemented.c
  test/Driver/avr-link-no-mcu-specified.c
  test/Driver/avr-link-nostdlib-nodefaultlibs.c

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