one working function in so

nix/pkgs/urcrypt/cross.nix

@@ -1,12 +0,0 @@
-{ env_name, env, deps }:
-
-env.make_derivation rec {
-  name    = "urcrypt";
-  builder = ./release.sh;
-  src     = ../../../pkg/urcrypt;
-
-  cross_inputs = [ deps.ed25519 deps.ge-additions ];
-
-  CC = "${env.host}-gcc";
-  AR = "${env.host}-ar";
-}

nix/pkgs/urcrypt/default.nix

@@ -5,5 +5,5 @@ pkgs.stdenv.mkDerivation rec {
   builder = ./builder.sh;
   src     = ../../../pkg/urcrypt;
 
-  nativeBuildInputs = [ ed25519 ge-additions ];
+  buildInputs = [ ed25519 ge-additions ];
 }

nix/pkgs/urcrypt/release.sh

@@ -1,13 +0,0 @@
-source $setup
-
-cp -r $src ./src
-chmod -R u+w ./src
-cd ./src
-
-for dep in $cross_inputs; do
-   export CFLAGS="${CFLAGS-} -I$dep/include"
-   export LDFLAGS="${LDFLAGS-} -L$dep/lib"
-done
-
-PREFIX=$out make install
-

nix/release.nix

@@ -19,9 +19,6 @@ let
   ge-additions = env:
     import ./pkgs/ge-additions/cross.nix env;
 
-  urcrypt = env:
-    import ./pkgs/urcrypt/cross.nix env;
-
   libaes_siv = env:
     import ./pkgs/libaes_siv/cross.nix env;
 

pkg/urcrypt/Makefile

@@ -6,14 +6,26 @@ PREFIX ?= ./out
 
 .PHONY: all test install clean
 
-all: urcrypt.c urcrypt.h
-	$(CC) $(CFLAGS) -O3 -Wall -Werror -pedantic -std=gnu99 -c urcrypt.c
-	$(AR) rcs liburcrypt.a urcrypt.o
+CFLAGS := $(CFLAGS) -O3 -Wall -Werror -pedantic -std=gnu99
+SOURCES = urcrypt.c urcrypt.h
+
+liburcrypt.a: $(SOURCES)
+	$(CC) $(CFLAGS) -c urcrypt.c -o urcrypt-static.o
+	$(AR) rcs liburcrypt.a urcrypt-static.o
+
+liburcrypt.so: $(SOURCES)
+	$(CC) $(CFLAGS) -fPIC -c urcrypt.c -o urcrypt-shared.o
+	$(CC) -shared urcrypt-shared.o -o liburcrypt.so \
+		-led25519 -lge-additions \
+		-Wl,--no-undefined
+
+all: liburcrypt.a liburcrypt.so
 
 install: all
 	@mkdir -p $(PREFIX)/lib/
 	@mkdir -p $(PREFIX)/include/
 	cp liburcrypt.a $(PREFIX)/lib/
+	cp liburcrypt.so $(PREFIX)/lib/
 	cp urcrypt.h $(PREFIX)/include/
 
 clean: