The Module object definitely needs to exist before including the main
.js file, otherwise the startup sequence won't connect to the right
object. I.e. the "Html file generating the error:" will not be
possible to work. I suppose changing to the working html file resolved
all the issues here(?)
2017-09-15 20:49 GMT+03:00 Dirk Vanden Boer <dirk....@gmail.com>:
> My minimal reproduction scenario:
>
> C++ source (asmerror.cpp):
> #include <emscripten/bind.h>
> #include <iostream>
>
> static void hello() {
> std::cout << "Hello wasm\n";
> }
>
> EMSCRIPTEN_BINDINGS(asmerror) {
> emscripten::function("hello", &hello);
> }
>
> Html file generating the error:
> <!doctype html>
> <html>
> <head><meta charset="UTF-8"></head>
> <body>
> <script type="text/javascript" src="asmerror.js"></script>
> <script type="text/javascript">
> var Module = {
> print: function(text) { console.log(text); },
> printErr: function(text) { console.error(text); },
> onRuntimeInitialized: function() {
> console.log("onRuntimeInitialized");
> Module.hello();
> }
> };
> </script>
> </body>
> </html>
>
> Html file that works:
> <!doctype html>
> <html>
> <head><meta charset="UTF-8"></head>
> <body>
> <script type="text/javascript">
> var Module = {
> print: function(text) { console.log(text); },
> printErr: function(text) { console.error(text); },
> onRuntimeInitialized: function() {
> console.log("onRuntimeInitialized");
> Module.hello();
> }
> };
> </script>
> <script type="text/javascript" src="asmerror.js"></script>
> </body>
> </html>
>
>
> CMakeLists.txt file to create webassembly (emcmake cmake .):
>
> cmake_minimum_required(VERSION 3.0)
> project(asmerror)
> set(CMAKE_CXX_STANDARD 11)
> set(CMAKE_CXX_EXTENSIONS OFF)
> find_program (EMCC emcc)
> if (NOT EMCC)
> message(FATAL_ERROR "Could not find emcc executable")
> endif ()
>
> add_library(asmerror SHARED
> asmerror.cpp
> )
>
> set_target_properties(asmerror PROPERTIES SUFFIX .bc)
>
> get_target_property(WASM_DIR asmerror ARCHIVE_OUTPUT_DIRECTORY)
> get_target_property(WASM_MODULE asmerror OUTPUT_NAME)
>
> add_custom_command(TARGET asmerror
> POST_BUILD
> COMMAND ${EMCC}
> ARGS
> -O3
> -s WASM=1
> -s TOTAL_MEMORY=96468992
> -s DISABLE_EXCEPTION_CATCHING=0
> -s ASSERTIONS=1
> --llvm-lto 1
> --bind
> $<TARGET_FILE:asmerror>
> -o $<TARGET_FILE_DIR:asmerror>/asmerror.js
> BYPRODUCTS
> ${CMAKE_BINARY_DIR}/asmerror.js
> ${CMAKE_BINARY_DIR}/asmerror.wasm
> COMMENT "Generating webassembly"
> )
>
> Hope this is clear
>
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