[ci] Add msys2 build to CI and run its testsuite on Windows (#310)

appveyor.yml

@@ -15,14 +15,26 @@ environment:
       ARCH: x86
       CFG: debug
 
+    - compiler: msys2
+      MINGW_PREFIX: /c/msys2/mingw64/
+      MINGW_CHOST: x86_64-w64-mingw32
+      MSYS2_ARCH: x86_64
+    - compiler: msys2
+      MINGW_PREFIX: /c/msys2/mingw32/
+      MINGW_CHOST: i686-w64-mingw32
+      MSYS2_ARCH: i686
+
 install:
   - C:\msys64\usr\bin\bash -lc "pacman --noconfirm -S mingw-w64-x86_64-ragel"
 
 build_script:
-  - '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" %ARCH%'
-  - C:\msys64\usr\bin\bash -lc "cd $APPVEYOR_BUILD_FOLDER; PATH=$PATH:/mingw64/bin:/mingw32/bin; ./autogen.sh; make distdir"
-  - cd harfbuzz-*\win32
-  - nmake /f Makefile.vc CFG=%CFG% DIRECTWRITE=1
+  - 'if "%compiler%"=="msvc" call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" %ARCH%'
+  - 'if "%compiler%"=="msvc" C:\msys64\usr\bin\bash -lc "cd $APPVEYOR_BUILD_FOLDER; PATH=$PATH:/mingw64/bin:/mingw32/bin; ./autogen.sh; make distdir"'
+  - 'if "%compiler%"=="msvc" cd harfbuzz-*\win32'
+  - 'if "%compiler%"=="msvc" nmake /f Makefile.vc CFG=%CFG% DIRECTWRITE=1'
+
+  - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "pacman --noconfirm -S mingw-w64-$MSYS2_ARCH-{freetype,cairo,icu,gettext,gobject-introspection,gcc,gcc-libs,glib2,graphite2,pkg-config}"'
+  - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "cd $APPVEYOR_BUILD_FOLDER; PATH=$PATH:/mingw64/bin:/mingw32/bin; ./autogen.sh --with-uniscribe --with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2 --build=$MINGW_CHOST --host=$MINGW_CHOST --prefix=$MINGW_PREFIX; make; make check"'
 
 # disable automatic tests
 test: off