Build and load Gmagick in PHP 7.0 on Windows 10, making Apache to stop service

Hi all, I built a gmagick extension for PHP 7.0 (VC14 x64 Thread Safe) on Windows 10. PHP 7.0 is the only version I use. I followed the steps in https://wiki.php.net/internals/windows/stepbystepbuild_sdk_2and built the php_gmagick.dll. Then I copied to the extension folder of php, enabled it in php.ini, and restarted Apache. I tested the extentsion by checking phpinfo.php from browser (chrome). It took a long time to load until Apache stopped service automatically. If I disable gmagick and restart Apache the phpinfo.php shows normally. There is no requirement of Graphicsmagick and Gmagick version, so I wonder if the version I picked might affect the building of extension. This is my building environment: - Windows 10 Pro 64 bit - Visual C++ 14.0 (Visual Studio 2015) - PHP SDK downloaded fromhttps://github.com/OSTC/php-sdk-binary-tools - PHP source (PHP 7.0 (7.0.29)) downloaded fromhttps://windows.php.net/ - PHP dependencies is fetched by calling phpsdk_deps -u - Gmagick 2.0.4RC1 downloaded fromhttp://pecl.php.net/ - Graphicsmagick 1.3.27 source downloaded from Graphicsmagick official page - I invoked phpsdk-vc14-x64.bat during the building process Is there anything wrong with the building environment?Where should I look to troubleshooting? Any other issues I should pay attention when building Gmagick on Windows? Thanks! Z