[FFmpeg-devel] [PATCH v2 1/2] configure, etc: unify shebang usage

[Martin Storsjö]

On Mon, 8 Apr 2024, J. Dekker wrote:

> In some cases, these scripts can be called directly by packagers, and
> some systems require the interpreter to be explicit.

It is unclear to me which of the changes are needed and for what reason, 
please elaborate much more in the commit message.

Is it possible to elaborate on "some systems require the interpreter to be 
explicit"? It'd be much nicer to reason about if there was a concrete 
example of such a case (even if it certainly is right to add the missing 
shebang line).

The changes I see fall into these categories:

- Change "#! <path>" into "#!<path>. Does this change have a functional 
effect for someone (where, and why?) or is it purely a cosmetic change?
- Add a shebang line in the generated ffbuild/config.sh. This script is 
highly unlikely to be useful to call on its own like that, so while this 
probably is good for consistency I don't see it ever making a difference.
- Add a shebang line in ffbuild/libversion.sh. I can see the value in 
calling this script directly, outside of our build system. I presume this 
is the actual change that makes a difference here?

I don't mind the changes, but I'd prefer to split them into two separate 
commits; add missing shebangs (with an example of the case where it really 
does make a difference), vs removing extra spaces in shebangs for 
consistency (with explicit clarification in the commit message whether 
this is only for stylistic consistency or whether it does make a 
difference somewhere, and if it does, where).

// Martin