One of the things that disturbed me from the article was how the Mozilla build chain just merrily ignores that profiling had failed, and moves on building stuff

One of the things that disturbed me from the article was how the Mozilla build chain just merrily ignores that profiling had failed, and moves on building stuff using that profile. That seems like quite dangerous behaviour. Surely that should be a failing step for a build, or at the very least a large warning should go out at the end "This build may be optimised based on complete nonsense because profiling failed"