Fix compile warnings on windows platform: dll linkage and others (#604)

product-mini/platforms/windows/CMakeLists.txt

@@ -15,6 +15,8 @@ set (CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
 
 set (CMAKE_C_STANDARD 99)
 
+add_definitions(-DCOMPILING_WASM_RUNTIME_API=1)
+
 # Set WAMR_BUILD_TARGET, currently values supported:
 # "X86_64", "AMD_64", "X86_32", "AARCH64[sub]", "ARM[sub]", "THUMB[sub]", "MIPS", "XTENSA"
 if (NOT DEFINED WAMR_BUILD_TARGET)
@@ -126,4 +128,3 @@ set_target_properties (libiwasm PROPERTIES OUTPUT_NAME iwasm)
 
 target_link_libraries (libiwasm ${LLVM_AVAILABLE_LIBS} ${UV_A_LIBS})
 
-target_compile_definitions(libiwasm PRIVATE COMPILING_WASM_RUNTIME_API=1)

product-mini/platforms/windows/main.c

@@ -185,8 +185,8 @@ module_reader_callback(const char *module_name, uint8 **p_buffer,
                        uint32 *p_size)
 {
     const char *format = "%s/%s.wasm";
-    int sz = strlen(module_search_path) + strlen("/") + strlen(module_name) +
-             strlen(".wasm") + 1;
+    uint32 sz = (uint32)(strlen(module_search_path) + strlen("/")
+                         + strlen(module_name) + strlen(".wasm") + 1);
     char *wasm_file_name = BH_MALLOC(sz);
     if (!wasm_file_name) {
         return false;