testing appveyor mingw64

.appveyor.yml

@@ -2,6 +2,12 @@ branches:
   only:
     - master
 
+environment:
+  matrix:
+    - BUILD_TYPE: Release
+      COMPILER: MinGW-w64
+      PLATFORM: x64
+
 install:
   - cmd: if not exist c:\dev\Eigen3\include\eigen3\Eigen\Core (
             curl -L -o eigen-eigen-dc6cfdf9bcec.tar.gz https://bitbucket.org/eigen/eigen/get/3.2.9.tar.gz &&
@@ -21,10 +27,10 @@ install:
 build_script:
   - git submodule update --init --recursive
   # MinGW files need to be at the beginning of the PATH
-  - set PATH=C:\MinGW\bin;%PATH%
+  - set PATH=C:\msys64\usr\bin;%PATH%
   # Workaround for CMake not wanting sh.exe on PATH for MinGW
   - rm "C:/Program Files/Git/usr/bin/sh.exe"
   - cmake -E make_directory build
-  - cmake -E chdir build cmake -D ACADOS_WITH_QPOASES=ON -D BLASFEO_TARGET=GENERIC -D HPIPM_TARGET=GENERIC -D BUILD_SHARED_LIBS=OFF -D ACADOS_EXAMPLES=ON -D ACADOS_UNIT_TESTS=ON -DEIGEN3_INCLUDE_DIR="C:\dev\Eigen3\include\eigen3" -G "MinGW Makefiles" ..
+  - cmake -E chdir build cmake -DCMAKE_PREFIX_PATH=C:\mingw64 -D ACADOS_WITH_QPOASES=ON -D BLASFEO_TARGET=GENERIC -D HPIPM_TARGET=GENERIC -D BUILD_SHARED_LIBS=OFF -D ACADOS_EXAMPLES=ON -D ACADOS_UNIT_TESTS=ON -DEIGEN3_INCLUDE_DIR="C:\dev\Eigen3\include\eigen3" -G "MinGW Makefiles" ..
   - cmake --build build --config Release
   - cmake -E chdir build ctest -V