emscripten::val::new_ fails in js code at runtime / during instantiation of Module when compiled as MAIN_MODULE #16451
Description
When I have a main with bindings and use emscripten::val::.new_() I get a js error at runtime.
#include <iostream>
#include <emscripten/val.h>
#include <emscripten/bind.h>
void hello_world()
{
emscripten::val xhr = emscripten::val::global("XMLHttpRequest").new_();
}
EMSCRIPTEN_BINDINGS(my_module) {
emscripten::function("hello_world", &hello_world);
}the error I see in the browsers console output is:
bindings.js:39028 Uncaught (in promise) RuntimeError: Aborted(Assertion failed: Missing signature argument to addFunction: function __emval_new(handle, argCount, argTypes, args) {
handle = Emval.toValue(handle);
var newer = emval_newers[argCount];
if (!newer) {
newer = craftEmvalAllocator(argCount);
emval_newers[argCount] = newer;
}
return newer(handle, argTypes, args);
})
at abort (bindings.js:39028)
at assert (bindings.js:38192)
at addFunction (bindings.js:38067)
at reportUndefinedSymbols (bindings.js:39926)
at preloadDylibs (bindings.js:39938)
at run (bindings.js:90244)
at runCaller (bindings.js:90178)
at removeRunDependency (bindings.js:39000)
at receiveInstance (bindings.js:39161)
at receiveInstantiationResult (bindings.js:39176)
abort @ bindings.js:39028
assert @ bindings.js:38192
addFunction @ bindings.js:38067
reportUndefinedSymbols @ bindings.js:39926
preloadDylibs @ bindings.js:39938
run @ bindings.js:90244
runCaller @ bindings.js:90178
removeRunDependency @ bindings.js:39000
receiveInstance @ bindings.js:39161
receiveInstantiationResult @ bindings.js:39176
Promise.then (async)
(anonymous) @ loader.html:12
removing the new_ call I get no error. I can use other emscripten::val functions without any trouble.
I use cmake as build system with the following CMakeLists.txt:
cmake_minimum_required(VERSION 3.9)
project(bindings VERSION 1.0.1 DESCRIPTION "bindings description")
if (NOT ${CMAKE_SYSTEM_NAME} MATCHES "Emscripten")
message( FATAL_ERROR "This example works ONLY with emscripten")
endif()
# link and compile flags ()
set(EM_FLAGS "--bind -s MAIN_MODULE=1 -s EXPORT_NAME=\"createMyModule\" -s FORCE_FILESYSTEM=1 -s MODULARIZE=1 -s EXPORT_ES6=0 -s USE_ES6_IMPORT_META=0 -v")
# compile flags
set(EM_CXX_FLAGS "${EM_CXX_FLAGS} ${EM_FLAGS} ")
# link flags
set(EM_LINKER_FLAGS "${EM_LINKER_FLAGS} ${EM_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EM_CXX_FLAGS}")
set(CMAKE_LINKER_FLAGS "${CMAKE_LINKER_FLAGS} ${EM_LINKER_FLAGS}")
add_executable(bindings main.cpp)I attached a zip file with the main.cpp the CMakeLists.txt , loader.html and a minimal Docker based build system to reproduce the error
reproduce.zip
Version of emscripten/emsdk:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.2 (a77b559)
clang version 14.0.0 (https://github.com/llvm/llvm-project 782c0dd1a1c235afb09a34e7da4a1267ead14765)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /home/derthorsten/src/emsdk/upstream/bin