As someone who worked on C compilers for DSPs for a few years, I was conditioned for a while to think "compilers are broken, libraries are broken - you have no hope" for a while, when all I dealt with was our software. Obviously that's heavily influenced by what I was actually dealing with day to day and not by normal software development, but still :)
One of the guys in my team handled a frantic support request from a Formula 1 team because they required reproducible builds or else they got some fine from the FIA, and they somehow hit a situation where our compiler was outputting different code depending on time of day. Wild.