https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116730
--- Comment #8 from Hime Haieto <himehaieto at gmail dot com> --- I am aware of how checking generated files, particularly from autotools, is a common practice employed for convenience. I am also aware of how easily it can mask bugs that could otherwise go unnoticed. Though it's reasonable to wonder if that may be the case here, for which it happens to be easy enough to disprove - since they are tracked in the repo, any differences between what it generated for me and what was generated upstream would show in the git status: # git status Not currently on any branch. Untracked files: (use "git add <file>..." to include in what will be committed) build/ nothing added to commit but untracked files present (use "git add" to track) So the autoreconf I ran produced byte-identical copies of the upstream files and had no divergent effect.