[ahartmetz]

Valgrind is fantastic.

Memcheck decreases the memory safety problem of C++ by about 80% in my experience - it really is a big deal. The compiler-based tools that require recompiling every library used are a bit impractical for large stacks such as the ones under Qt-based GUI applications. Several libraries, several build systems. But I hear that they are popular for CI systems in large projects such as web browsers, which probably have dedicated CI developers. There are also some IME rare problems that these tools can find that Memcheck can't, which is due to information unavailable in compiled code. Still, Memcheck has the largest coverage by far.

Callgrind and Cachegrind give very precise, repeatable results, complementary to but not replacing perf and AMD / Intel tooling which use hardware performance counters. I tend to use all of them. They all work without recompiling.