Robert Haas <> writes:
> Based on discussion downthread, it seems like what we actually need to
> do is update perl.m4 to extract CCFLAGS.  Turns out somebody proposed
> a patch for that back in 2002:
> It seems to need a rebase.  :-)

Ah-hah, I *thought* we had considered the question once upon a time.
There were some pretty substantial compatibility concerns raised in that
thread, which is doubtless why it's still like that.

My beef about inter-compiler compatibility (if building PG with a
different compiler from that used for Perl) could probably be addressed by
absorbing only -D switches from the Perl flags.  But Peter seemed to feel
that even that could break things, and I worry that he's right for cases
like -D_FILE_OFFSET_BITS which affect libc APIs.  Usually we'd have made
the same decisions as Perl for that sort of thing, but if we didn't, it's
a mess.

I wonder whether we could adopt some rule like "absorb -D switches
for macros whose names do not begin with an underscore".  That's
surely a hack and three-quarters, but it seems safer than just
absorbing everything willy-nilly.

                        regards, tom lane

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