Emscripten Fails to Build Qt5 App - Please Help

[DragonOsman]

I'm trying to build a Qt5 app to Wasm and I passed this command:

em++ -std=c++17 -Wall -pedantic -I"C:\Qt\5.13.1\wasm_32\include" -I"C:\Qt\5.13.1\wasm_32\include\QtCore" -I"C:\Qt\5.13.1\wasm_32\include\QtPrintSupport" -I"C:\Qt\5.13.1\wasm_32\include\QtWidgets" main.cpp notepad.cpp -LC:\Qt\5.13.1\wasm_32\lib -s WASM=1 -s EXPORT_ALL=1 -o notepad.js 2> build.log

Here's a link to the build.log file.

main.cpp:

#include "notepad.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication EditorApp(argc, argv);
    Notepad Editor;
    Editor.show();

    return EditorApp.exec();
}

notepad.h:

#ifndef NOTEPAD_H
#define NOTEPAD_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui
{
class Notepad;
}
QT_END_NAMESPACE

class Notepad : public QMainWindow
{
    Q_OBJECT

public:
    explicit Notepad(QWidget *parent = nullptr);
    ~Notepad();

private slots:
    void on_actionNew_triggered();

    void on_actionOpen_triggered();

    void on_actionSave_triggered();

    void on_actionSave_As_triggered();

    void on_actionPrint_triggered();

    void on_actionExit_triggered();

    void on_actionCopy_triggered();

    void on_actionCut_triggered();

    void on_actionPaste_triggered();

    void on_actionUndo_triggered();

    void on_actionRedo_triggered();

    void on_actionSelect_Font_triggered();

    void on_actionBold_triggered();

    void on_actionItalic_triggered();

    void on_actionUnderline_triggered();

private:
    Ui::Notepad *ui;
    QString current_file;
};
#endif // NOTEPAD_H

notepad.cpp:

#include "notepad.h"
#include "../build-notepad-project-Desktop_Qt_5_13_1_MSVC2017_64bit-Release/ui_notepad.h"

#include <QFileDialog>
#include <QMessageBox>
#include <QTextStream>
#include <QPrinter>
#include <QPrintDialog>
#include <QFontDialog>
#include <QFile>

Notepad::Notepad(QWidget *parent)
    : QMainWindow{parent}
    , ui{new Ui::Notepad}
{
    ui->setupUi(this);
    this->setCentralWidget(ui->textEdit);

    connect(ui->actionNew, &QAction::triggered, this, &Notepad::on_actionNew_triggered);
    connect(ui->actionOpen, &QAction::triggered, this, &Notepad::on_actionOpen_triggered);
    connect(ui->actionSave, &QAction::triggered, this, &Notepad::on_actionSave_triggered);
    connect(ui->actionSave_As, &QAction::triggered, this, &Notepad::on_actionSave_As_triggered);
    connect(ui->actionPrint, &QAction::triggered, this, &Notepad::on_actionPrint_triggered);
    connect(ui->actionExit, &QAction::triggered, this, &Notepad::on_actionExit_triggered);
    connect(ui->actionCopy, &QAction::triggered, this, &Notepad::on_actionCopy_triggered);
    connect(ui->actionCut, &QAction::triggered, this, &Notepad::on_actionCut_triggered);
    connect(ui->actionPaste, &QAction::triggered, this, &Notepad::on_actionPaste_triggered);
    connect(ui->actionUndo, &QAction::triggered, this, &Notepad::on_actionUndo_triggered);
    connect(ui->actionRedo, &QAction::triggered, this, &Notepad::on_actionRedo_triggered);
    connect(ui->actionSelect_Font, &QAction::triggered, this, &Notepad::on_actionSelect_Font_triggered);
    connect(ui->actionBold, &QAction::triggered, this, &Notepad::on_actionBold_triggered);
    connect(ui->actionItalic, &QAction::triggered, this, &Notepad::on_actionItalic_triggered);
    connect(ui->actionUnderline, &QAction::triggered, this, &Notepad::on_actionUnderline_triggered);

    // Disable menu actions for unavailable features
#if !QT_CONFIG(printer)
    ui->actionPrint->setEnabled(false);
#endif

#if !QT_CONFIG(clipboard)
    ui->actionCut->setEnabled(false);
    ui->actionCopy->setEnabled(false);
    ui->actionPaste->setEnabled(false);
#endif
}

Notepad::~Notepad()
{
    delete ui;
}


void Notepad::on_actionNew_triggered()
{
    current_file.clear();
    ui->textEdit->setText(QString());
}

void Notepad::on_actionOpen_triggered()
{
    QString file_name = QFileDialog::getOpenFileName(this, "Open the file");
    QFile file(file_name);

    current_file = file_name;
    if (!file.open(QIODevice::ReadOnly | QFile::Text))
    {
        QMessageBox::warning(this, "Warning", "Cannot open file: " + file.errorString());
        return;
    }

    setWindowTitle(file_name);
    QTextStream in(&file);
    QString text = in.readAll();
    ui->textEdit->setText(text);
    file.close();
}

void Notepad::on_actionSave_triggered()
{
    QString file_name;

    // If we don't have a filename from before, get one.
    if (current_file.isEmpty())
    {
        file_name = QFileDialog::getSaveFileName(this, "Save");
        current_file = file_name;
    }
    else
    {
        file_name = current_file;
    }

    QFile file(file_name);
    if (!file.open(QIODevice::WriteOnly | QFile::Text)) {
        QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
        return;
    }

    setWindowTitle(file_name);
    QTextStream out(&file);
    QString text = ui->textEdit->toPlainText();
    out << text;
    file.close();
}

void Notepad::on_actionSave_As_triggered()
{
    QString file_name{QFileDialog::getSaveFileName(this, "Save as")};
    QFile file{file_name};

    if (!file.open(QFile::WriteOnly | QFile::Text))
    {
        QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
        return;
    }

    current_file = file_name;
    setWindowTitle(file_name);
    QTextStream out{&file};
    QString text{ui->textEdit->toPlainText()};
    out << text;
    file.close();
}

void Notepad::on_actionPrint_triggered()
{
#if QT_CONFIG(printer)
    QPrinter print_device;
#if QT_CONFIG(printdialog)
    QPrintDialog dialog{&print_device, this};
    if (dialog.exec() == QDialog::Rejected)
    {
        return;
    }
#endif // QT_CONFIG(printdialog)
#endif // QT_CONFIG(printer)
}

void Notepad::on_actionExit_triggered()
{
    QCoreApplication::quit();
}

void Notepad::on_actionCopy_triggered()
{
#if QT_CONFIG(clipboard)
    ui->textEdit->copy();
#endif
}

void Notepad::on_actionCut_triggered()
{
#if QT_CONFIG(clipboard)
    ui->textEdit->cut();
#endif
}

void Notepad::on_actionPaste_triggered()
{
#if QT_CONFIG(clipboard)
    ui->textEdit->paste();
#endif
}

void Notepad::on_actionUndo_triggered()
{
    ui->textEdit->undo();
}

void Notepad::on_actionRedo_triggered()
{
    ui->textEdit->redo();
}

void Notepad::on_actionSelect_Font_triggered()
{
    bool font_selected;
    QFont font{QFontDialog::getFont(&font_selected, this)};

    if (font_selected)
    {
        ui->textEdit->setFont(font);
    }
}

void Notepad::on_actionBold_triggered()
{
    ui->textEdit->setFontWeight(QFont::Weight::Bold);
}

void Notepad::on_actionItalic_triggered()
{
    ui->textEdit->setFontItalic(true);
}

void Notepad::on_actionUnderline_triggered()
{
    ui->textEdit->setFontUnderline(true);
}
```ui_notepad.h:
```cpp
/********************************************************************************
** Form generated from reading UI file 'notepad.ui'
**
** Created by: Qt User Interface Compiler version 5.13.1
**
** WARNING! All changes made in this file will be lost when recompiling UI file!
********************************************************************************/

#ifndef UI_NOTEPAD_H
#define UI_NOTEPAD_H

#include <QtCore/QVariant>
#include <QtWidgets/QAction>
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtWidgets/QMenu>
#include <QtWidgets/QMenuBar>
#include <QtWidgets/QStatusBar>
#include <QtWidgets/QTextEdit>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QWidget>

QT_BEGIN_NAMESPACE

class Ui_Notepad
{
public:
    QAction *actionNew;
    QAction *actionOpen;
    QAction *actionSave;
    QAction *actionSave_As;
    QAction *actionPrint;
    QAction *actionExit;
    QAction *actionCopy;
    QAction *actionCut;
    QAction *actionPaste;
    QAction *actionUndo;
    QAction *actionRedo;
    QAction *actionSelect_Font;
    QAction *actionBold;
    QAction *actionItalic;
    QAction *actionUnderline;
    QWidget *centralwidget;
    QVBoxLayout *verticalLayout;
    QTextEdit *textEdit;
    QMenuBar *menubar;
    QMenu *menuNew;
    QMenu *menuOpen;
    QMenu *menuSave;
    QMenu *menuSave_As;
    QMenu *menuPrint;
    QMenu *menuExit;
    QMenu *menuCopy;
    QMenu *menuCut;
    QMenu *menuPaste;
    QMenu *menuUndo;
    QMenu *menuRedo;
    QMenu *menuSelect_Font;
    QMenu *menuBold;
    QMenu *menuItalic;
    QMenu *menuUnderline;
    QStatusBar *statusbar;

    void setupUi(QMainWindow *Notepad)
    {
        if (Notepad->objectName().isEmpty())
            Notepad->setObjectName(QString::fromUtf8("Notepad"));
        Notepad->resize(800, 400);
        actionNew = new QAction(Notepad);
        actionNew->setObjectName(QString::fromUtf8("actionNew"));
        actionOpen = new QAction(Notepad);
        actionOpen->setObjectName(QString::fromUtf8("actionOpen"));
        actionSave = new QAction(Notepad);
        actionSave->setObjectName(QString::fromUtf8("actionSave"));
        actionSave_As = new QAction(Notepad);
        actionSave_As->setObjectName(QString::fromUtf8("actionSave_As"));
        actionPrint = new QAction(Notepad);
        actionPrint->setObjectName(QString::fromUtf8("actionPrint"));
        actionExit = new QAction(Notepad);
        actionExit->setObjectName(QString::fromUtf8("actionExit"));
        actionCopy = new QAction(Notepad);
        actionCopy->setObjectName(QString::fromUtf8("actionCopy"));
        actionCut = new QAction(Notepad);
        actionCut->setObjectName(QString::fromUtf8("actionCut"));
        actionPaste = new QAction(Notepad);
        actionPaste->setObjectName(QString::fromUtf8("actionPaste"));
        actionUndo = new QAction(Notepad);
        actionUndo->setObjectName(QString::fromUtf8("actionUndo"));
        actionRedo = new QAction(Notepad);
        actionRedo->setObjectName(QString::fromUtf8("actionRedo"));
        actionSelect_Font = new QAction(Notepad);
        actionSelect_Font->setObjectName(QString::fromUtf8("actionSelect_Font"));
        actionBold = new QAction(Notepad);
        actionBold->setObjectName(QString::fromUtf8("actionBold"));
        actionItalic = new QAction(Notepad);
        actionItalic->setObjectName(QString::fromUtf8("actionItalic"));
        actionUnderline = new QAction(Notepad);
        actionUnderline->setObjectName(QString::fromUtf8("actionUnderline"));
        centralwidget = new QWidget(Notepad);
        centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
        verticalLayout = new QVBoxLayout(centralwidget);
        verticalLayout->setObjectName(QString::fromUtf8("verticalLayout"));
        textEdit = new QTextEdit(centralwidget);
        textEdit->setObjectName(QString::fromUtf8("textEdit"));

        verticalLayout->addWidget(textEdit);

        Notepad->setCentralWidget(centralwidget);
        menubar = new QMenuBar(Notepad);
        menubar->setObjectName(QString::fromUtf8("menubar"));
        menubar->setGeometry(QRect(0, 0, 800, 21));
        menuNew = new QMenu(menubar);
        menuNew->setObjectName(QString::fromUtf8("menuNew"));
        menuOpen = new QMenu(menubar);
        menuOpen->setObjectName(QString::fromUtf8("menuOpen"));
        menuSave = new QMenu(menubar);
        menuSave->setObjectName(QString::fromUtf8("menuSave"));
        menuSave_As = new QMenu(menubar);
        menuSave_As->setObjectName(QString::fromUtf8("menuSave_As"));
        menuPrint = new QMenu(menubar);
        menuPrint->setObjectName(QString::fromUtf8("menuPrint"));
        menuExit = new QMenu(menubar);
        menuExit->setObjectName(QString::fromUtf8("menuExit"));
        menuCopy = new QMenu(menubar);
        menuCopy->setObjectName(QString::fromUtf8("menuCopy"));
        menuCut = new QMenu(menubar);
        menuCut->setObjectName(QString::fromUtf8("menuCut"));
        menuPaste = new QMenu(menubar);
        menuPaste->setObjectName(QString::fromUtf8("menuPaste"));
        menuUndo = new QMenu(menubar);
        menuUndo->setObjectName(QString::fromUtf8("menuUndo"));
        menuRedo = new QMenu(menubar);
        menuRedo->setObjectName(QString::fromUtf8("menuRedo"));
        menuSelect_Font = new QMenu(menubar);
        menuSelect_Font->setObjectName(QString::fromUtf8("menuSelect_Font"));
        menuBold = new QMenu(menubar);
        menuBold->setObjectName(QString::fromUtf8("menuBold"));
        menuItalic = new QMenu(menubar);
        menuItalic->setObjectName(QString::fromUtf8("menuItalic"));
        menuUnderline = new QMenu(menubar);
        menuUnderline->setObjectName(QString::fromUtf8("menuUnderline"));
        Notepad->setMenuBar(menubar);
        statusbar = new QStatusBar(Notepad);
        statusbar->setObjectName(QString::fromUtf8("statusbar"));
        Notepad->setStatusBar(statusbar);

        menubar->addAction(menuNew->menuAction());
        menubar->addAction(menuOpen->menuAction());
        menubar->addAction(menuSave->menuAction());
        menubar->addAction(menuSave_As->menuAction());
        menubar->addAction(menuPrint->menuAction());
        menubar->addAction(menuExit->menuAction());
        menubar->addAction(menuCopy->menuAction());
        menubar->addAction(menuCut->menuAction());
        menubar->addAction(menuPaste->menuAction());
        menubar->addAction(menuUndo->menuAction());
        menubar->addAction(menuRedo->menuAction());
        menubar->addAction(menuSelect_Font->menuAction());
        menubar->addAction(menuBold->menuAction());
        menubar->addAction(menuItalic->menuAction());
        menubar->addAction(menuUnderline->menuAction());
        menuNew->addAction(actionNew);
        menuOpen->addAction(actionOpen);
        menuSave->addAction(actionSave);
        menuSave_As->addAction(actionSave_As);
        menuPrint->addAction(actionPrint);
        menuExit->addAction(actionExit);
        menuCopy->addAction(actionCopy);
        menuCut->addAction(actionCut);
        menuPaste->addAction(actionPaste);
        menuUndo->addAction(actionUndo);
        menuRedo->addAction(actionRedo);
        menuSelect_Font->addAction(actionSelect_Font);
        menuBold->addAction(actionBold);
        menuItalic->addAction(actionItalic);
        menuUnderline->addAction(actionUnderline);

        retranslateUi(Notepad);

        QMetaObject::connectSlotsByName(Notepad);
    } // setupUi

    void retranslateUi(QMainWindow *Notepad)
    {
        Notepad->setWindowTitle(QCoreApplication::translate("Notepad", "Notepad", nullptr));
        actionNew->setText(QCoreApplication::translate("Notepad", "New", nullptr));
        actionOpen->setText(QCoreApplication::translate("Notepad", "Open", nullptr));
        actionSave->setText(QCoreApplication::translate("Notepad", "Save", nullptr));
        actionSave_As->setText(QCoreApplication::translate("Notepad", "Save As", nullptr));
        actionPrint->setText(QCoreApplication::translate("Notepad", "Print", nullptr));
        actionExit->setText(QCoreApplication::translate("Notepad", "Exit", nullptr));
        actionCopy->setText(QCoreApplication::translate("Notepad", "Copy", nullptr));
        actionCut->setText(QCoreApplication::translate("Notepad", "Cut", nullptr));
        actionPaste->setText(QCoreApplication::translate("Notepad", "Paste", nullptr));
        actionUndo->setText(QCoreApplication::translate("Notepad", "Undo", nullptr));
        actionRedo->setText(QCoreApplication::translate("Notepad", "Redo", nullptr));
        actionSelect_Font->setText(QCoreApplication::translate("Notepad", "Select Font", nullptr));
        actionBold->setText(QCoreApplication::translate("Notepad", "Bold", nullptr));
        actionItalic->setText(QCoreApplication::translate("Notepad", "Italic", nullptr));
        actionUnderline->setText(QCoreApplication::translate("Notepad", "Underline", nullptr));
        menuNew->setTitle(QCoreApplication::translate("Notepad", "New", nullptr));
        menuOpen->setTitle(QCoreApplication::translate("Notepad", "Open", nullptr));
        menuSave->setTitle(QCoreApplication::translate("Notepad", "Save", nullptr));
        menuSave_As->setTitle(QCoreApplication::translate("Notepad", "Save As", nullptr));
        menuPrint->setTitle(QCoreApplication::translate("Notepad", "Print", nullptr));
        menuExit->setTitle(QCoreApplication::translate("Notepad", "Exit", nullptr));
        menuCopy->setTitle(QCoreApplication::translate("Notepad", "Copy", nullptr));
        menuCut->setTitle(QCoreApplication::translate("Notepad", "Cut", nullptr));
        menuPaste->setTitle(QCoreApplication::translate("Notepad", "Paste", nullptr));
        menuUndo->setTitle(QCoreApplication::translate("Notepad", "Undo", nullptr));
        menuRedo->setTitle(QCoreApplication::translate("Notepad", "Redo", nullptr));
        menuSelect_Font->setTitle(QCoreApplication::translate("Notepad", "Select Font", nullptr));
        menuBold->setTitle(QCoreApplication::translate("Notepad", "Bold", nullptr));
        menuItalic->setTitle(QCoreApplication::translate("Notepad", "Italic", nullptr));
        menuUnderline->setTitle(QCoreApplication::translate("Notepad", "Underline", nullptr));
    } // retranslateUi

};

namespace Ui {
    class Notepad: public Ui_Notepad {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_NOTEPAD_H

Please help. Thanks in advance.

[DragonOsman]

Update: I read that I had to run qmake and then nmake on Windows to build a Qt app, also for Wasm builds, so I tried that. But because I'm using the LLVM Wasm backend, I got this error:

shared:ERROR: BINARYEN_TRAP_MODE is not supported by the LLVM wasm backend
NMAKE : fatal error U1077: 'C:\emsdk\upstream\emscripten\em++.BAT' : return code '0x1'
Stop.

Full output:

C:\Qt\5.13.1\wasm_32\bin\uic.exe notepad.ui -o ui_notepad.h
        em++ -c -O3 -std=gnu++1z -s ALLOW_MEMORY_GROWTH=1 -Wall -W -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -IC:\Qt\5.13.1\wasm_32\include -IC:\Qt\5.13.1\wasm_32\include\QtPrintSupport -IC:\Qt\5.13.1\wasm_32\include\QtWidgets -IC:\Qt\5.13.1\wasm_32\include\QtGui -IC:\Qt\5.13.1\wasm_32\include\QtCore -I. -I. -I/.emscripten_ports/openssl/include -IC:\Qt\5.13.1\wasm_32\mkspecs\wasm-emscripten -o main.obj main.cpp
        em++ -c -O3 -std=gnu++1z -s ALLOW_MEMORY_GROWTH=1 -Wall -W -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -IC:\Qt\5.13.1\wasm_32\include -IC:\Qt\5.13.1\wasm_32\include\QtPrintSupport -IC:\Qt\5.13.1\wasm_32\include\QtWidgets -IC:\Qt\5.13.1\wasm_32\include\QtGui -IC:\Qt\5.13.1\wasm_32\include\QtCore -I. -I. -I/.emscripten_ports/openssl/include -IC:\Qt\5.13.1\wasm_32\mkspecs\wasm-emscripten -o notepad.obj notepad.cpp
        em++ -c -O3 -std=gnu++1z -s ALLOW_MEMORY_GROWTH=1 -Wall -W -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -IC:\Qt\5.13.1\wasm_32\include -IC:\Qt\5.13.1\wasm_32\include\QtPrintSupport -IC:\Qt\5.13.1\wasm_32\include\QtWidgets -IC:\Qt\5.13.1\wasm_32\include\QtGui -IC:\Qt\5.13.1\wasm_32\include\QtCore -I. -I. -I/.emscripten_ports/openssl/include -IC:\Qt\5.13.1\wasm_32\mkspecs\wasm-emscripten -o notepad.js_plugin_import.obj E:/programming/Qt/notepad-project/notepad.js_plugin_import.cpp
        em++ -O3 -std=gnu++1z -s ALLOW_MEMORY_GROWTH=1 -Wall -W -dM -E -o moc_predefs.h C:\Qt\5.13.1\wasm_32\mkspecs\features\data\dummy.cpp
        C:\Qt\5.13.1\wasm_32\bin\moc.exe -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB --include E:/programming/Qt/notepad-project/moc_predefs.h -IC:/Qt/5.13.1/wasm_32/mkspecs/wasm-emscripten -IE:/programming/Qt/notepad-project -IC:/Qt/5.13.1/wasm_32/include -IC:/Qt/5.13.1/wasm_32/include/QtPrintSupport -IC:/Qt/5.13.1/wasm_32/include/QtWidgets -IC:/Qt/5.13.1/wasm_32/include/QtGui -IC:/Qt/5.13.1/wasm_32/include/QtCore notepad.h -o moc_notepad.cpp
        em++ -c -O3 -std=gnu++1z -s ALLOW_MEMORY_GROWTH=1 -Wall -W -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -IC:\Qt\5.13.1\wasm_32\include -IC:\Qt\5.13.1\wasm_32\include\QtPrintSupport -IC:\Qt\5.13.1\wasm_32\include\QtWidgets -IC:\Qt\5.13.1\wasm_32\include\QtGui -IC:\Qt\5.13.1\wasm_32\include\QtCore -I. -I. -I/.emscripten_ports/openssl/include -IC:\Qt\5.13.1\wasm_32\mkspecs\wasm-emscripten -o moc_notepad.obj moc_notepad.cpp
        sed -e s/@APPNAME@/notepad/g C:/Qt/5.13.1/wasm_32/plugins/platforms/wasm_shell.html > E:/programming/Qt/notepad-project/notepad.html
        copy /y C:\Qt\5.13.1\wasm_32\plugins\platforms\qtloader.js E:\programming\Qt\notepad-project
        1 file(s) copied.
        copy /y C:\Qt\5.13.1\wasm_32\plugins\platforms\qtlogo.svg E:\programming\Qt\notepad-project
        1 file(s) copied.
        em++ -s WASM=1 -s FULL_ES2=1 -s USE_WEBGL2=1 -s NO_EXIT_RUNTIME=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 --bind -s "BINARYEN_TRAP_MODE='clamp'" -O3 -s ALLOW_MEMORY_GROWTH=1 -o notepad.js main.obj  notepad.obj  notepad.js_plugin_import.obj  moc_notepad.obj   C:/Qt/5.13.1/wasm_32/plugins/platforms/libqwasm.a C:/Qt/5.13.1/wasm_32/lib/libQt5EventDispatcherSupport.a C:/Qt/5.13.1/wasm_32/lib/libQt5FontDatabaseSupport.a C:/Qt/5.13.1/wasm_32/lib/libqtfreetype.a C:/Qt/5.13.1/wasm_32/lib/libQt5EglSupport.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqgif.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqicns.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqico.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqjpeg.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqtga.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqtiff.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqwbmp.a C:/Qt/5.13.1/wasm_32/plugins/imageformats/libqwebp.a C:/Qt/5.13.1/wasm_32/lib/libQt5PrintSupport.a C:/Qt/5.13.1/wasm_32/lib/libQt5Widgets.a C:/Qt/5.13.1/wasm_32/lib/libQt5Gui.a C:/Qt/5.13.1/wasm_32/lib/libqtlibpng.a C:/Qt/5.13.1/wasm_32/lib/libqtharfbuzz.a C:/Qt/5.13.1/wasm_32/lib/libQt5Core.a C:/Qt/5.13.1/wasm_32/lib/libqtpcre2.a
shared:ERROR: BINARYEN_TRAP_MODE is not supported by the LLVM wasm backend
NMAKE : fatal error U1077: 'C:\emsdk\upstream\emscripten\em++.BAT' : return code '0x1'
Stop.

How do I fix this? Thanks.

Edit for update: I just tried taking out the BINARYEN_TRAP_MODE part and replacing it with EXPORT_ALL=1 but that also gave errors. Just removing it without replacing it with anything also had the same result.

[DragonOsman]

Calling the qmake program by default creates this Makefile: https://gist.github.com/DragonOsman/52618d0cea47871244d62f17a02a042a . How should I edit it to make it work with the Wasm backend?

[sbc100]

Can you post the error you get when removing BINARYEN_TRAP_MODE?

Where is BINARYEN_TRAP_MODE coming from? Is it part of the Qt build system or your project?

Do the Qt examples build for you? Perhaps file a bug with Qt if nothing is working for you?

[DragonOsman]

I posted the Makefile above. It's generated by the qmake program. That Makefile is what's giving the BINARYEN_TRAP_MODE option.

The error I get for it is just:

shared:ERROR: BINARYEN_TRAP_MODE is not supported by the LLVM wasm backend
NMAKE : fatal error U1077: 'C:\emsdk\upstream\emscripten\em++.BAT' : return code '0x1'
Stop.

The Makefile again: https://gist.github.com/DragonOsman/52618d0cea47871244d62f17a02a042a

[sbc100]

I meant, after removing BINARYEN_TRAP_MODE what error do you get?

The fact that BINARYEN_TRAP_MODE is in the generated Makefile is probably something that needs to be fixed upstream in Qt.

[DragonOsman]

I'm trying right now. I gave the command to redirect the output to a file. But it's taking a really long time. I'll get back to you when it's done.

[DragonOsman]

Okay, it was taking too long so I had to kill it. Too many errors. All I can say is that there were a whole bunch of exceptions from Python. I think you should try to reproduce it on your end. On Windows it requires Qt version 5.13.1, nmake, sed and MinGW. Make a Qt app and try to compile it to Wasm using the Wasm backend using the Makefile generated by qmake as is.

They have this patch that can be applied but I don't know how to apply it: https://codereview.qt-project.org/c/qt/qtbase/+/266814/2/mkspecs/wasm-emscripten/qmake.conf .

[DragonOsman]

Even after taking out the line in the qmake.conf file for clamp mode and adding the patch, I still get those errors. Note: This is one part of the stream of errors:

error: unknown warning option '-Wno-int-in-bool-context'; did you mean '-Wno-gnu-include-next'?
      [-Werror,-Wunknown-warning-option]
error: unknown warning option '-Wno-int-in-bool-context'; did you mean '-Wno-gnu-include-next'?
      [-Werror,-Wunknown-warning-option]
shared:ERROR: 'C:/emsdk/upstream/bin\clang.exe -target wasm32-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=38 -D__EMSCRIPTEN_tiny__=46 -D_LIBCPP_ABI_VERSION=2 -Dunix -D__unix -D__unix__ -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\libcxx -Xclang -isystemC:\emsdk\upstream\emscripten\system\lib\libcxxabi\include -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\compat -Xclang -isystemC:\emsdk\upstream\emscripten\system\include -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\libc -Xclang -isystemC:\emsdk\upstream\emscripten\system\lib\libc\musl\arch\emscripten -Xclang -isystemC:\emsdk\upstream\emscripten\system\local\include -Wno-int-in-bool-context -c -Werror -Os -fno-builtin -Wno-return-type -Wno-parentheses -Wno-ignored-attributes -Wno-shift-count-overflow -Wno-shift-negative-value -Wno-dangling-else -Wno-unknown-pragmas -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-logical-op-parentheses -Wno-bitwise-op-parentheses -Wno-visibility -Wno-pointer-sign -Wno-absolute-value -Wno-empty-body -Wno-int-in-bool-context -IC:\emsdk\upstream\emscripten\system\lib\libc\musl\src\internal -IC:\emsdk\upstream\emscripten\system\lib\libc\musl\arch\js -DEMSCRIPTEN C:\emsdk\upstream\emscripten\system\lib\libc\musl\src\stdlib\qsort.c -fno-inline-functions -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\SDL -c -o C:\Users\Osman\AppData\Local\Temp\emscripten_temp_bduibeac\qsort.c.o -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr' failed (1)

I'm getting a huge, seemingly endless stream of errors that looks like that. This is the same as what's been happening since before.

[DragonOsman]

Here's a link to a log file (I finally managed to get it).

[sbc100]

It looks like the version of emcc you are running and the version of clang do not match.

What version of emsdk are you using? Are you sure the version emcc you are using comes from emsdk? What does emcc --version tell you?

If you are using 1.38.47 or 1.38.48 then -Wno-int-in-bool-context should no longer be passed to clang. See #9508

[DragonOsman]

Emscripten version is 1.38.46. The version of Clang I have is version 10.0.0. Do I need to clone it again to get the latest version? I'll try installing the latest-upstream package again and see if that helps.

And yes, I'm sure the emcc I'm using comes from emsdk.

[sbc100]

Are you building llvm yourself? If you are using emsdk you shouldn't need to do that since it ships with prebuilt, known-good, llvm versions.

If you are building it yourself then yes you do need to keep you llvm version to to date.

[DragonOsman]

No, I didn't build LLVM myself. I'm using the version 10 that comes with the sdk when you run emsdk install latest-upstream.

I now have version 1.38.48 of Emscripten, but there's another problem now:

wasm-ld: error: main.obj: machine type must be wasm32
wasm-ld: error: moc_main.obj: machine type must be wasm32
wasm-ld: error: main.obj: machine type must be wasm32
wasm-ld: error: moc_main.obj: machine type must be wasm32
wasm-ld: error: moc_main.obj: machine type must be wasm32
wasm-ld: error: main.obj: machine type must be wasm32
wasm-ld: error: main.obj: machine type must be wasm32
wasm-ld: error: main.obj: machine type must be wasm32
wasm-ld: error: main.obj: machine type must be wasm32
wasm-ld: error: qprinter.obj: machine type must be wasm32
wasm-ld: error: qprintdialog_unix.obj: machine type must be wasm32
wasm-ld: error: qaction.obj: machine type must be wasm32
wasm-ld: error: qapplication.obj: machine type must be wasm32
wasm-ld: error: qboxlayout.obj: machine type must be wasm32
wasm-ld: error: qwidget.obj: machine type must be wasm32
wasm-ld: error: qmainwindow.obj: machine type must be wasm32
wasm-ld: error: qmenu.obj: machine type must be wasm32
wasm-ld: error: qmenubar.obj: machine type must be wasm32
wasm-ld: error: qstatusbar.obj: machine type must be wasm32
wasm-ld: error: qtextedit.obj: machine type must be wasm32

I did it in a Developer Command Prompt with x64 mode on first so I thought switching to x86 might help, but that gave me the same error too. Any idea how I could fix this?

[sbc100]

This means those object file most likely were not compiled with ./emcc or if they were an alternative --target argument might have been given when they were compiled.

You can use file main.obj to find out the file type of a given object.

It would also help if you could post the command line that was use to build one of the objects?

[DragonOsman]

I was told to use mingw32-make, but when I tried that I got pretty much the same result: https://gist.github.com/DragonOsman/4b5a04e0546d3ccc21c67cc978510e70 .