Reworking structure. Adding proper C exports. Fix neededmain

emcc is annoying me with its caching. Tries to write into /nix/store
locations, which is shouldn't do. Need the proper env variable to
rewrite. Otherwise it'll be ignored.

1 files changed, 31 insertions, 0 deletions

diff --git a/c++/.nix/derivation.nix b/c++/.nix/derivation.nix
new file mode 100644
index 0000000..a47b023
--- /dev/null
+++ b/c++/.nix/derivation.nix
@@ -0,0 +1,31 @@
+{ lib
+, stdenv
+, pname
+, version
+}:
+
+stdenv.mkDerivation {
+	inherit pname version;
+
+	src = ./..;
+
+	dontConfigure = true;
+	buildPhase = ''
+		HOME=$(pwd)
+		EM_CACHE=$TMPDIR/emscripten_cache
+    emcc lights_out.cpp \
+      -s WASM=1 \
+      -s EXPORTED_FUNCTIONS='["_fake_main"]' \
+      -s EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' \
+      -o lights_out.js
+	'';
+
+	# Silence the warnings for now
+	checkPhase = ''
+	'';
+
+	installPhase = ''
+		mkdir -p $out
+		cp lights_out.{wasm,js} $out/
+	'';
+}