Safer seed of rand with WASM.

lib/std/math/random/math.seeder.c3

@@ -72,8 +72,9 @@ macro uint hash(value) @local
 	return fnv32a::encode(&&bitcast(value, char[$sizeof(value)]));
 }
 
-fn char[8 * 4] entropy()
+fn char[8 * 4] entropy() @if(!env::WASM_NOLIBC)
 {
+
 	void* addr = malloc(1);
 	free(addr);
 	static uint random_int;
@@ -89,4 +90,16 @@ fn char[8 * 4] entropy()
 		hash(allocator::heap())
     };
     return bitcast(entropy_data, char[8 * 4]);
+}
+
+fn char[8 * 4] entropy() @if(env::WASM_NOLIBC)
+{
+	static uint random_int;
+	random_int += 0xedf19156;
+	uint[8] entropy_data = {
+		hash($$TIME),
+		hash(&entropy),
+		random_int,
+    };
+    return bitcast(entropy_data, char[8 * 4]);
 }

releasenotes.md

@@ -56,6 +56,7 @@
 - Fix bug when passing a type as a compile time value.
 - Fix bug due to enum associated values not being checked for liveness.
 - Regression when compile time accessing a union field not last assigned to.
+- Safer seed of rand() for WASM without libc.
 
 ### Stdlib changes
 - Additional init functions for hashmap.