Re: [HACKERS] Make defines in pg_config_manual.h conditional?

Andres Freund <andres@anarazel.de> writes:
> ATM the defines in pg_config_manual.h are largely unconditional - which
> means the file has to be edited instead of being able to override things
> via CFLAGS/COPT.  Is there any good reason for doing so?

YES.  If you do things like that, the installed version of
pg_config_manual.h will not reflect the way the backend was built,
which is likely to break pgxs-type builds of addon modules later.

Just edit the file.
        regards, tom lane