NVC is a GPLv3 VHDL compiler and simulator

See these posts for more information:
  http://www.doof.me.uk/2011/11/05/writing-a-vhdl-compiler/
  http://www.doof.me.uk/2012/04/15/vhdl-compiler-improvements/

To build from a Git clone:
  ./autogen.sh
  mkdir build && cd build
  ../configure
  make
  make install

To use a specific version of LLVM add
  --with-llvm=/path/to/llvm-config
to the configure command. LLVM 3.0 or later is required.

To run the regression tests:
  make check
Note you may need to install additional Ruby libraries:
  gem install colorize getopt

To recompile the standard libraries:
  make -C lib clean
  make bootstrap
Note this happens automatically when installing.