supertux/tools/valgrind

You can use this script and suppressions file to run SuperTux under Valgrind
( http://www.valgrind.org/ ) to catch memory errors and leaks.

Some things to be aware of:

- Some C++ objects appear to use interior pointers, which will cause valgrind to
report parts of their still-reachable instances as "possibly lost". You can
ignore those reports.

- In the GNU C++ library, a std::string object contains a pointer to a
heap-allocated "representation" buffer containing the actual data. If you
free a heap-allocated std::string S without destructing it (uncommon but not
unheard of), you'll leak the representation. But representations are shared
and copied on write, so if S was a copy of another string S', Valgrind will
blame the leak on the code that created S' because that was when the
representation was allocated. (Valgrind doesn't know any better without
instrumenting constructors and destructors.) Watch out for this. When it
first happened to me (Matt McCutchen), I was stumped for a while; finally,
I wrote some small test programs and realized what was happening.