nixpkgs/pkgs/development/compilers/ghdl/test-simple.nix

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{ stdenv, ghdl-llvm, ghdl-mcode, backend }:
let
ghdl = if backend == "llvm" then ghdl-llvm else ghdl-mcode;
in
stdenv.mkDerivation {
name = "ghdl-test-simple";
meta.timeout = 300;
nativeBuildInputs = [ ghdl ];
buildCommand = ''
cp ${./simple.vhd} simple.vhd
cp ${./simple-tb.vhd} simple-tb.vhd
mkdir -p ghdlwork
ghdl -a --workdir=ghdlwork --ieee=synopsys simple.vhd simple-tb.vhd
ghdl -e --workdir=ghdlwork --ieee=synopsys -o sim-simple tb
'' + (if backend == "llvm" then ''
./sim-simple --assert-level=warning > output.txt
'' else ''
ghdl -r --workdir=ghdlwork --ieee=synopsys tb > output.txt
'') + ''
diff output.txt ${./expected-output.txt} && touch $out
'';
}