https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116400

--- Comment #10 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
> It would be much nicer if we could do something more like other places
> in the compiler, where there is some script to run in the source directory
> that can be done when one changes the m4 (and independently of the build).

I strongly agree with that, for two reasons:

- the build system is a complicated mess, and we don't have people skilled
enough to fix the existing issues (otherwise we would have fixed this PR)
- as a maintainer, I like to be able to regenerate files before/without doing a
build, to look at the changes

I'd rather have a script like libgfortran/regenerate.sh, that calls m4 and
updates the tree. Then maintainers know that, if they changed any m4 file, they
need to regenerate. (It does not happen that often.)

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