bug#8362: make install prefix inserted in source code with generated python files

[Mike Frysinger]

On 21 Mar 2023 23:05, Bogdan wrote:
>   Third, and most important (I think) is that we need to note that 
> "prog/x.py" is GENERATED, but is NOT marked so. Adding
> 
>       BUILT_SOURCES = prog/x.py

i don't think this is a correct use of BUILT_SOURCES.
https://www.gnu.org/software/automake/manual/automake.html#Sources

that var is meant for generating headers before Automake's depgen logic
can kick in.  that sounds minor, but in practice it means that every
built source is generated before anything else is compiled.  which can
insert a bubble into parallel build pipelines.  so we would prefer it
only be used for things that matter to header dependency generation.
-mike

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