WebAssembly: Initial commit

This change adds WebAssembly support in the shape of a plugin.

- Auto-detection of the emsdk toolchain
- Handling of "asmjs-unknown-emscripten" Abi
- Binary detection of WebAssembly libraries
- Auto-creation of a "WebAssembly runtime" device (with icon)
- Runconfiguration that launches the application via the "emrun"
  tool which spawns a local web server and runs the application on
  the chosen web browser.

Limitations:
- So far only tested on Windows/MinGW and Linux
- Not yet tested with Qt WebAssembly installation form the installer
  Only tested with self-built Qt and manually added kit
- The attempt to launch an application via emrun, while a previous
  application is still running, will fail. The reason is that the
  web servers spawned by emrun listen to the same default port but
  serve only the content of one application.
  Possible solutions: We could either spawn the different web servers
  with different ports, or we could use one single web server instance
  which serves the whole default project location (home directory).

Task-number: QTCREATORBUG-21068
Task-number: QTCREATORBUG-22249
Change-Id: I1a16fbe52382d45c37e9bc624a943a6ca475fa09
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/webassembly/webassemblyrunconfiguration.cpp

@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "webassemblyrunconfigurationaspects.h"
+#include "webassemblyrunconfiguration.h"
+#include "webassemblyconstants.h"
+
+#include <projectexplorer/buildconfiguration.h>
+#include <projectexplorer/target.h>
+
+#include <QDir>
+
+namespace WebAssembly {
+namespace Internal {
+
+EmrunRunConfiguration::EmrunRunConfiguration(ProjectExplorer::Target *target,
+                                             Core::Id id)
+    : ProjectExplorer::CustomExecutableRunConfiguration(target, id)
+{
+    auto executableAspect = aspect<ProjectExplorer::ExecutableAspect>();
+    executableAspect->setExecutable(
+                target->activeBuildConfiguration()->environment().searchInPath("python"));
+    executableAspect->setVisible(false);
+
+    auto workingDirectoryAspect = aspect<ProjectExplorer::WorkingDirectoryAspect>();
+    workingDirectoryAspect->setVisible(false);
+
+    auto terminalAspect = aspect<ProjectExplorer::TerminalAspect>();
+    terminalAspect->setVisible(false);
+
+    auto argumentsAspect = aspect<ProjectExplorer::ArgumentsAspect>();
+    argumentsAspect->setVisible(false);
+
+    auto webBrowserAspect = addAspect<WebBrowserSelectionAspect>(target);
+    connect(webBrowserAspect, &WebBrowserSelectionAspect::changed,
+            this, &EmrunRunConfiguration::updateConfiguration);
+    connect(target->activeBuildConfiguration(),
+            &ProjectExplorer::BuildConfiguration::buildDirectoryChanged,
+            this, &EmrunRunConfiguration::updateConfiguration);
+
+    addAspect<EffectiveEmrunCallAspect>();
+
+    updateConfiguration();
+}
+
+EmrunRunConfigurationFactory::EmrunRunConfigurationFactory()
+    : ProjectExplorer::FixedRunConfigurationFactory(
+          EmrunRunConfiguration::tr("Launch with emrun"))
+{
+    registerRunConfiguration<EmrunRunConfiguration>(Constants::WEBASSEMBLY_RUNCONFIGURATION_EMRUN);
+    addSupportedTargetDeviceType(Constants::WEBASSEMBLY_DEVICE_TYPE);
+}
+
+void EmrunRunConfiguration::updateConfiguration()
+{
+    const QFileInfo emrunScript =
+            target()->activeBuildConfiguration()->environment().searchInPath("emrun").toFileInfo();
+    const QString arguments =
+            emrunScript.absolutePath() + "/" + emrunScript.baseName() + ".py "
+            + QString("--browser %1 ").arg(aspect<WebBrowserSelectionAspect>()->currentBrowser())
+            + "--no_emrun_detect "
+            + target()->activeBuildConfiguration()->buildDirectory().toString()
+            + macroExpander()->expandProcessArgs("/%{CurrentProject:Name}.html");
+    aspect<ProjectExplorer::ArgumentsAspect>()->setArguments(arguments);
+    aspect<EffectiveEmrunCallAspect>()->setValue(commandLine().toUserOutput());
+}
+
+} // namespace Internal
+} // namespace Webassembly