Visual Studio 2008 C++ code slower than Visual Studio 2005

最新推荐文章于 2025-08-14 15:46:39 发布

原创最新推荐文章于 2025-08-14 15:46:39 发布 · 965 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#c++ #optimization #microsoft #build

在Visual Studio 2008 SP1中存在一个/O2优化级别的严重问题，即使设置为/O2，实际可能未进行优化。解决方法是先将优化级别设为无优化，再改回/O2。可以通过检查优化设置的文字是否加粗来判断是否受影响。

" In Visual Studio 2008 SP1 (SP1 not RTM) there is a serious bug with /O2 optimization. One way this bug can be triggered is by upgrading a project from a previous version. Even though the project setting shows the release build is set to /O2, the build can be not optimized at all. To work around it you have to change the setting to no optimization, apply, and then change it back to /O2. The quick way to see if this is needed is to check whether the setting for optimization is in bold or regular - if's it's bold you're OK; if it's regular text you're not.

This bug has been reported to Microsoft by many people over the past few months via the Connect feedback site but every case has been closed by them without doing anything and for completely invalid reasons."

Please check the following link for details:

http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/fb32033b-7bad-439b-a94c-943a17f0cbb2