add mxe32-qt

mxe32-qt/Dockerfile

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+FROM ubuntu:xenial
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update -qq \
+    && apt-get install -y --no-install-recommends \
+       curl gnupg2 openssl apt-transport-https ca-certificates \
+    echo mxe \
+    && curl -sSL "https://pkg.mxe.cc/repos/apt/client-conf/mxeapt.gpg" | apt-key add - \
+    && echo "deb https://pkg.mxe.cc/repos/apt xenial main" >> /etc/apt/sources.list \
+    && apt-get update -qq \
+    && apt-get install -y --no-install-recommends \
+       make \
+       mxe-i686-w64-mingw32.static-cc \
+       mxe-i686-w64-mingw32.static-qtbase \
+       mxe-i686-w64-mingw32.static-qtserialport \
+       mxe-i686-w64-mingw32.static-qttools \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Add a qmake alias
+RUN ln -s /usr/lib/mxe/usr/i686-w64-mingw32.static/qt5/bin/qmake  /usr/lib/mxe/usr/bin/qmake
+
+# Enhance path
+ENV PATH /usr/lib/mxe/usr/bin:$PATH
+
+ENTRYPOINT [ "/bin/sh", "-c" ]
+
+CMD ["qmake && make"]
+
+##########################################################################
+# Here the project specific workflow starts.
+
+WORKDIR /src
+

mxe32-qt/README.adoc

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+# mxe-qt
+
+This is a docker container that includes MXE toolchain for building windows applications inside docker for CI/CD purposes.
+It includes a compiler, linguist tools and qt5base and qt5serialport packages. 
+Packages are for x86 (i686) static flavors.
+Packages are installed from MXE debian repository (https://pkg.mxe.cc/repos/apt/client-conf/mxeapt.gpg).
+
+Other packages can be added easily, provided `pkg.mxe.cc` is up. Example of installation:
+```
+apt-get update -qq
+apt-get install mxe-i686-w64-mingw32.static-qtcharts
+```
+
+# Usage example (for GitLab CI/CD yaml)
+
+Build project that is in current directory:
+
+```
+docker run -it --rm -v `pwd`:/src mxe-qt "qmake && make"
+
+```
+
+or just `docker run -it --rm -v `pwd`:/src mxe-qt` (it does the same `qmake` and `make`)
+
+Most probably, the binary will end up in `./release`