enable WASI

Makefile

@@ -2,9 +2,9 @@ TARGET = sqlite3
 CC = /bin/clang
 SYSROOT = /share/wasi-sysroot
 TARGET_TRIPLE = wasm32-wasi
-CFLAGS = -nostartfiles -fvisibility=hidden
+CFLAGS = -fvisibility=hidden
 SDK = sdk/logger.h
-LDFLAGS = -Wl,--no-entry,--demangle,--allow-undefined
+LDFLAGS = -Wl,--demangle,--allow-undefined
 EXPORT_FUNCS = \
 	--export=allocate,$\
 	--export=deallocate,$\

src/wrapper.c

@@ -27,3 +27,8 @@ int get_result_size(void) {
 const char *get_result_ptr() {
   return RESULT_PTR;
 }
+
+int main() {
+  // the main purpose of this empty main is to initialize WASi subsystem
+  return 0;
+}