两个GCC编译用于相同的输入，生成两个不同的代码（第二个错误）

I am having a strange issue with GCC (4.6.4, Ubuntu 12.04) sometimes, I am using it to compile a huge project (hundreds of files and hundreds of thousands of lines of code), but I recently spotted something. After certain compiles (seems to happen randomly), I get a specific piece of code compiled differently and erroneously, causing undefined behavior in my code:I am having a strange issue with GCC (4.6.4, Ub