Use msvc to compile py2.7 and py3.4 to avoid incompatibility.

appveyor.bat

@@ -10,21 +10,6 @@ REM ======================
 
 mkdir src\.libs
 
-IF %PYTHON_VERSION%==2.7 GOTO build_core_mingw
-IF %PYTHON_VERSION%==3.4 GOTO build_core_mingw
-IF %PYTHON_VERSION%==3.5 GOTO build_core_msvc
-IF %PYTHON_VERSION%==3.6 GOTO build_core_msvc
-
-:build_core_mingw
-pushd src\.libs
-cmake -G "%generator%" -Dprotobuf_BUILD_SHARED_LIBS=%BUILD_DLL% -Dprotobuf_UNICODE=%UNICODE% -DZLIB_ROOT=%ZLIB_ROOT% -Dprotobuf_BUILD_TESTS=OFF -D"CMAKE_MAKE_PROGRAM:PATH=%MINGW%/mingw32-make.exe" ../../cmake
-mingw32-make
-dir
-SET PATH=%cd%;%PATH%
-popd
-GOTO build_core_end
-
-:build_core_msvc
 mkdir vcprojects
 pushd vcprojects
 cmake -G "%generator%" -Dprotobuf_BUILD_SHARED_LIBS=%BUILD_DLL% -Dprotobuf_UNICODE=%UNICODE% -Dprotobuf_BUILD_TESTS=OFF ../cmake
@@ -35,9 +20,6 @@ copy vcprojects\Release\libprotobuf.lib src\.libs\libprotobuf.a
 copy vcprojects\Release\libprotobuf-lite.lib src\.libs\libprotobuf-lite.a
 SET PATH=%cd%\vcprojects\Release;%PATH%
 dir vcprojects\Release
-GOTO build_core_end
-
-:build_core_end
 
 REM ======================
 REM Build python library
@@ -58,6 +40,8 @@ REM sed -i '/Wno-sign-compare/a \ \ \ \ extra_compile_args.append(\'-DMS_WIN64\'
 REM sed -i 's/\'-DPYTHON_PROTO2_CPP_IMPL_V2\'/\'-DPYTHON_PROTO2_CPP_IMPL_V2\',\'-DMS_WIN64\'/g' setup.py
 REM :no_win64_change
 
+sed -i 's/\ extra_compile_args\ =\ \[\]/\ extra_compile_args\ =\ \[\'\/MT\'\]/g' setup.py
+
 REM REM MSVS default is dymanic
 REM IF NOT DEFINED vcplatform GOTO msvc_static_build_end
 REM sed -i '/Wno-sign-compare/a \ \ \ \ extra_compile_args.append(\'/MT\')' setup.py

appveyor.yml

@@ -8,8 +8,6 @@ environment:
     PACKAGE_NAME: protobuf
     BUILD_COMMIT: v3.5.2
     BUILD_VERSION: 3.5.2
-    MINGW_32: C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin
-    MINGW_64: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin
     BUILD_DLL: OFF
     UNICODE: ON
     PB_TEST_DEP: "six==1.9"
@@ -63,9 +61,19 @@ install:
     - python -m pip install -U pip
     - pip install wheel
 
-    # # Fix MSVC builds for 64-bit Python. See:
-    # # http://stackoverflow.com/questions/32091593/cannot-install-windows-sdk-7-1-on-windows-10
-    # - echo "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64 > "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64/vcvars64.bat"
+    # Fix MSVC builds for 64-bit Python. See:
+    # http://stackoverflow.com/questions/32091593/cannot-install-windows-sdk-7-1-on-windows-10
+    - echo "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64 > "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64/vcvars64.bat"
+
+    # Fix MSVC builds for 64-bit Python2.7. See:
+    # https://help.appveyor.com/discussions/kb/38-visual-studio-2008-64-bit-builds
+    - curl -L -o vs2008_patch.zip https://github.com/menpo/condaci/raw/master/vs2008_patch.zip
+    - 7z x vs2008_patch.zip -ovs2008_patch
+    - cd vs2008_patch
+    - CALL setup_x64.bat
+    - dir "C:\Program Files (x86)\"
+    - copy "C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin\vcvars64.bat" "C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\bin\amd64\vcvarsamd64.bat"
+    - cd ..
 
     # Check that we have the expected version and architecture for Python
     - python --version
@@ -82,6 +90,18 @@ install:
     - del /Q zlib-src.zip
 
 before_build:
+    - if %PYTHON%==C:\Python27 set generator=Visual Studio 9 2008
+    - if %PYTHON%==C:\Python27 set vcplatform=Win32
+
+    - if %PYTHON%==C:\Python27-x64 set generator=Visual Studio 9 2008 Win64
+    - if %PYTHON%==C:\Python27-x64 set vcplatform=x64
+
+    - if %PYTHON%==C:\Python34 set generator=Visual Studio 10 2010
+    - if %PYTHON%==C:\Python34 set vcplatform=Win32
+
+    - if %PYTHON%==C:\Python34-x64 set generator=Visual Studio 10 2010 Win64
+    - if %PYTHON%==C:\Python34-x64 set vcplatform=x64
+
     - if %PYTHON%==C:\Python35 set generator=Visual Studio 14
     - if %PYTHON%==C:\Python35 set vcplatform=Win32
 
@@ -94,21 +114,6 @@ before_build:
     - if %PYTHON%==C:\Python36-x64 set generator=Visual Studio 14 Win64
     - if %PYTHON%==C:\Python36-x64 set vcplatform=x64
 
-    - if %PYTHON%==C:\Python27 set MINGW=%MINGW_32%
-    - if %PYTHON%==C:\Python27-x64 set MINGW=%MINGW_64%
-    - if %PYTHON%==C:\Python34 set MINGW=%MINGW_32%
-    - if %PYTHON%==C:\Python34-x64 set MINGW=%MINGW_64%
-
-    - if %PYTHON_VERSION%==2.7 set generator=MSYS Makefiles
-    - if %PYTHON_VERSION%==2.7 set PATH=%MINGW%;%PATH%
-    - if %PYTHON_VERSION%==2.7 echo [build] > %PYTHON%\Lib\distutils\distutils.cfg
-    - if %PYTHON_VERSION%==2.7 echo.compiler = mingw32 >> %PYTHON%\Lib\distutils\distutils.cfg
-
-    - if %PYTHON_VERSION%==3.4 set generator=MSYS Makefiles
-    - if %PYTHON_VERSION%==3.4 set PATH=%MINGW%;%PATH%
-    - if %PYTHON_VERSION%==3.4 echo [build] > %PYTHON%\Lib\distutils\distutils.cfg
-    - if %PYTHON_VERSION%==3.4 echo.compiler = mingw32 >> %PYTHON%\Lib\distutils\distutils.cfg
-
 build_script:
     - CALL appveyor.bat