https://bugs.exim.org/show_bug.cgi?id=1819
--- Comment #3 from Heiko Schlittermann <hs@???> ---
(A) We create a set of built-in macros. Each new Exim release defines an
additional(!) macro as
EXIM_VERSION_ge_4.87
EXIM_VERSION_ge_4.88
# use an option that is available on 4.87 and newer
.ifdef EXIM_VERSION_ge_4.87
foo = bar
.endif
This doesn't scale well with if we have tons of versions. I do not
expect this :)
What to do in testing environments and the advent of new options between
to releases?
(B) We have "feature test macros"
.ifdef HAVE_main.foo
foo = bar
.endif
begin routers
blix:
driver = dnslookup
# use a new routers specific option
.ifdef HAVE_routers.keep_frox
keep_frox = yes
.endif
# use a new dnslookup specific option
.ifdef HAVE_dnslookup.foo_bar
foo_bar = baz
.endif
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