[Bug 202949] bsd.options.mk: do-* target helpers fail to override default definitions

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202949

--- Comment #3 from Jan Beich <jbeich at FreeBSD.org> ---
If converting do-* targets conditionals to option helpers requires quirks the
documentation should explicitly say so. Other target helpers don't require
special attention: pre-* and post-* mainly concatenate rules to an existing
do-* target.


Besides, NO_FOO isn't always equivalent to an empty target:

  # Mk/bsd.port.mk
  .if defined(NO_BUILD) && !target(build)
  build: configure
          @${TOUCH} ${TOUCH_FLAGS} ${BUILD_COOKIE}
  .endif

which would make a port skip build if it has only do-build-${opt}-on/off.

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