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Generating testcases

cargo build --release --target=./arduino.json --verbose
# grab the `rustc ...` invocation
# add `--emit=llvm-ir`
# Look for `target/arduino/release/deps/foo.0.ll`

Building LLVM

cmake \
  -D CMAKE_BUILD_TYPE=Debug \
  -D LLVM_ENABLE_ASSERTIONS=ON \
  -D LLVM_TARGETS_TO_BUILD="X86" \
  -D LLVM_EXPERIMENTAL_TARGETS_TO_BUILD="AVR" \
  -D LLVM_INCLUDE_EXAMPLES=OFF \
  -D LLVM_INCLUDE_TESTS=OFF \
  -D LLVM_INCLUDE_DOCS=OFF \
  -D LLVM_ENABLE_ZLIB=OFF \
  -D WITH_POLLY=OFF \
  -D LLVM_ENABLE_TERMINFO=OFF \
  -D LLVM_ENABLE_LIBEDIT=OFF \
  ..