Long live Open Watcom toolchain

This patch adds basic support for the Open Watcom toolchain.
This patch uses the `owcc` compiler (supplied with the toolchain),
which is a wrapper that supports the POSIX standard.

Reason is that the native OW compiler and linker has a limitations
in the command line arguments (e.g. they have wrong quotes handling
and so on).

This patch supports both the latest official version v1.9 and also
its fork v2.0.

Also added the CI autotests for the version v2.0 for the Windows
host. These autotests only perform a limited number of tests (only
the bare-metal tests) due to the following toolchain limitations:

 * The toolchain does not have STL support (there seems to be some
kind of the partial support in the form of separate legacy STL ports).

 * The toolchain support something compatible with the C++98 standard.

 * The toolchain does not support the shared libraries on Linux hosts.

These limitations make it impossible or unjustified to reuse most
of the available tests (it requires a lot of work).

There was also an attempt to set up CI for tests on Linux host, but
for some reason the toolchain installer crashes on CI (although it
works fine on a local PC with Ubuntu).

Change-Id: Iecf76f51f0b09d31a89683f786b9cd7a825f235e
Reviewed-by: Ivan Komissarov <ABBAPOH@gmail.com>

3 files changed, 133 insertions, 0 deletions

diff --git a/doc/reference/cli/cli-options.qdocinc b/doc/reference/cli/cli-options.qdocinc
index a993f6d12..db8eeae48 100644
--- a/doc/reference/cli/cli-options.qdocinc
+++ b/doc/reference/cli/cli-options.qdocinc
@@ -501,6 +501,7 @@
         \li \c sdcc
         \li \c cosmic
         \li \c dmc
+        \li \c watcom
      \endlist
 
 //! [type]
diff --git a/doc/reference/items/probe/watcom-probe.qdoc b/doc/reference/items/probe/watcom-probe.qdoc
new file mode 100644
index 000000000..9c1c7486c
--- /dev/null
+++ b/doc/reference/items/probe/watcom-probe.qdoc
@@ -0,0 +1,129 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qbs.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** 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 Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \qmltype WatcomProbe
+    \inqmlmodule QbsProbes
+    \ingroup list-of-items
+    \keyword QML.WatcomProbe
+    \inherits PathProbe
+    \brief Collects Oopen Watcom toolchain compiler information.
+    \since Qbs 1.22
+    \internal
+
+    Detects the version, supported architecture, the platform
+    endianness, and other stuff for the specified compiler executable
+    from the \l{https://github.com/open-watcom}{Open Watcom} toolchain.
+*/
+
+/*!
+    \qmlproperty string WatcomProbe::compilerFilePath
+
+    An input property which is a full path to the Digital Mars compiler
+    executable.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty string WatcomProbe::architecture
+
+    Detected architecture of the target platform's processor.
+
+    The only possible value is \c "x86".
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty string WatcomProbe::endianness
+
+    Detected endianness of the target platform's processor architecture.
+
+    The possible values are \c "big" and \c "little".
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty string WatcomProbe::targetPlatform
+
+    Detected target platform.
+
+    The possible values are \c "windows" and \c "linux".
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty int WatcomProbe::versionMajor
+
+    Detected major compiler version.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty int WatcomProbe::versionMinor
+
+    Detected minor compiler version.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty int WatcomProbe::versionPatch
+
+    Detected patch compiler version.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty stringList WatcomProbe::includePaths
+
+    Detected compiler include paths.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty var WatcomProbe::compilerDefinesByLanguage
+
+    Detected set of compiler pre-defined macros depending
+    on the \c "C" or \c "C++" language.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty var WatcomProbe::environment
+
+    Detected compiler run environment.
+
+    \nodefaultvalue
+*/
diff --git a/doc/reference/modules/qbs-module.qdoc b/doc/reference/modules/qbs-module.qdoc
index 06f68cf5f..029f6f2cd 100644
--- a/doc/reference/modules/qbs-module.qdoc
+++ b/doc/reference/modules/qbs-module.qdoc
@@ -536,6 +536,9 @@
         \li \c{"sdcc"}
         \li \c{["sdcc"]}
     \row
+        \li \c{"watcom"}
+        \li \c{["watcom"]}
+    \row
         \li \c{"xcode"}
         \li \c{["xcode", "clang", "llvm", "gcc"]}
     \endtable