bare-metal: Add SDCC toolchain support

This commit adds a basic support for the SDCC compiler:

 * http://sdcc.sourceforge.net/

As this compiler support multiple architectures, then it is impossible
to uniquely identify the current architecture by dumping of the
pre-defined macros (because its content depends on a target flag). In
this case the cpp.architecture will contains a default architecture
(which is dumped with an omitted target flag).

To use it with Qt Creator, it is enough to add there a desired Kit
with a custom SDCC C/C++ compiler, and then set the following in the
Kit's Qbs profile settings:

* Key: qbs.toolchainType
* Value: sdcc

To create the SDCC profile it is enougth to use the following
command:

 qbs setup-toolchains --type sdcc <path/to/sdcc/compiler/binary> <profile
name>

A toolchain type can be omitted; in this case the QBS will
tries to detect the toolchain type from the specified compiler
name.

Also it is possible to auto-detect the SDCC toolchain from the
PATH environment using the following command:

 qbs setup-toolchain --detect

At current time are supported only the 8051 (aka MCS51) architecture;
other architectures can be added later.

Change-Id: I8cc239d62e35472ab667e054a64a1e59c2d548bd
Reviewed-by: Richard Weickelt <richard@weickelt.de>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

2 files changed, 94 insertions, 0 deletions

diff --git a/doc/reference/cli/cli-options.qdocinc b/doc/reference/cli/cli-options.qdocinc
index 2d35bea61..d4c3280a2 100644
--- a/doc/reference/cli/cli-options.qdocinc
+++ b/doc/reference/cli/cli-options.qdocinc
@@ -496,6 +496,7 @@
         \li \c msvc
         \li \c iar
         \li \c keil
+        \li \c sdcc
      \endlist
 
 //! [type]
diff --git a/doc/reference/items/probe/sdcc-probe.qdoc b/doc/reference/items/probe/sdcc-probe.qdoc
new file mode 100644
index 000000000..1353eb736
--- /dev/null
+++ b/doc/reference/items/probe/sdcc-probe.qdoc
@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+/*!
+    \contentspage list-of-probes.html
+    \qmltype SdccProbe
+    \ingroup list-of-probes
+    \ingroup list-of-items
+    \keyword QML.SdccProbe
+    \inherits PathProbe
+    \brief Collects SDCC toolchain compiler information.
+    \since Qbs 1.14
+    \internal
+
+    Detects the version, supported architecture and the platform
+    endianness of the specified compiler executable file from the
+    \l{http://sdcc.sourceforge.net/}{SDCC} toolchain.
+*/
+
+/*!
+    \qmlproperty string SdccProbe::compilerFilePath
+
+    An input property which is a full path to the SDCC compiler executable file.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty string SdccProbe::architecture
+
+    Detected architecture of the target platform's processor.
+
+    The possible values are \c "mcs51".
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty string SdccProbe::endianness
+
+    Detected endianness of the target platform's processor architecture.
+
+    The possible values are \c "little".
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty int SdccProbe::versionMajor
+
+    Detected major compiler version.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty int SdccProbe::versionMinor
+
+    Detected minor compiler version.
+
+    \nodefaultvalue
+*/
+
+/*!
+    \qmlproperty int SdccProbe::versionPatch
+
+    Detected patch compiler version.
+
+    \nodefaultvalue
+*/