One I recall, working on a C++ program that we distributed to Windows, Linux and PowerPC OSX at the time, was how some platforms had memory zero-initialized by

One I recall, working on a C++ program that we distributed to Windows, Linux and PowerPC OSX at the time, was how some platforms had memory zero-initialized by the OS memory manager, and some didn't. Our code didn't mean to take advantage of this, but it sometimes meant buggy code would appear fine on one platform as pointers in structures would be zeroed out, but crash on others where they weren't. As I recall, it was mostly that and the endianess that caused the most grief. Not that there was many issues at all since we used Qt and Boost...