Not-quite-working WASM

Romulus-M/CMakeLists.txt

@@ -5,5 +5,14 @@ set(SRC
     skinny_reference.c
 )
 
-add_library(romulus-m SHARED ${SRC})
-install(TARGETS romulus-m)
+if(EMSCRIPTEN)
+    # WASM requires an executable, so we use a dummy target that doesn't do anything
+    # and link our library into it.
+    add_library(romulus-m STATIC ${SRC})
+    add_executable(romulus-m-wasm "main.c")
+    target_link_libraries(romulus-m-wasm PRIVATE romulus-m)
+    target_link_options(romulus-m-wasm PRIVATE -s EXPORTED_FUNCTIONS=['_main', '_crypto_aead_encrypt', '_crypto_aead_decrypt'])
+else()
+    add_library(romulus-m SHARED ${SRC})
+    install(TARGETS romulus-m)
+endif()

Romulus-M/export.h

@@ -8,6 +8,9 @@
 
 #ifdef _WIN32
 #define EXPORT __declspec(dllexport)
-#else
+#elif __linux__
 #define EXPORT __attribute__((visibility("default")))
+#elif __EMSCRIPTEN__
+#include <emscripten.h>
+#define EXPORT EMSCRIPTEN_KEEPALIVE
 #endif

Romulus-M/main.c

@@ -0,0 +1,10 @@
+/**
+ * BUTLERSAURUS 2022 addition
+ *
+ * This file exists to create a fake dummy executable target, which is required
+ * when compiling for WASM.
+ */
+int main(void)
+{
+    return 0;
+}