maintainer-feedback requested: [Bug 251509] Mk/Uses/gnome.mk: USE_GNOME_IMPL does not propagate :build etc, creating bogus dependencies

Bugzilla Automation <[email protected]> has asked freebsd-x11 (Nobody)
<[email protected]> for maintainer-feedback:
Bug 251509: Mk/Uses/gnome.mk: USE_GNOME_IMPL does not propagate :build etc,
creating bogus dependencies
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251509



--- Description ---
graphics/libdrm has this:

MANPAGES_USE=		GNOME=libxslt:build

Obviously the intention is to use libxslt only during the build.

Now, gnome.mk has:

libxslt_USE_GNOME_IMPL= libxml2

and the way these implications are handled is (minus the unknown check):

. for component in ${USE_GNOME:C/^([^:]+).*/\1/}
_USE_GNOME+=	${${component}_USE_GNOME_IMPL} ${component}
. endfor

Oops, the :build flag is lost (literally deleted by the :C/../../ and never
handled), not propagated, so we basically have USE_GNOME=libxml2 — so this ends
up in the pkg +MANIFEST:

  "deps": {
    "libpciaccess": {
      "origin": "devel/libpciaccess",
      "version": "0.16"
    },
    "libxml2": {
      "origin": "textproc/libxml2",
      "version": "2.9.10_1"
    }
  },

But libdrm does not actually depend on libxml2 at runtime!!

---

How I noticed this is that poudriere fails to install anything that depends on
libdrm:

===>   mesa-devel-20.3.b.786 depends on package: libva>0 - not found
===>   Installing existing package /packages/All/libva-2.9.1.tzst
[unrelenting.technology] Installing libva-2.9.1...
[unrelenting.technology] `-- Installing libXfixes-5.0.3_2...
[unrelenting.technology] `-- Extracting libXfixes-5.0.3_2: .......... done
[unrelenting.technology] `-- Installing libdrm-2.4.103,1...
[unrelenting.technology] |   `-- Installing libpciaccess-0.16...
[unrelenting.technology] |   | `-- Installing pciids-20201025...
[unrelenting.technology] |   | `-- Extracting pciids-20201025: ..... done
[unrelenting.technology] |   `-- Extracting libpciaccess-0.16: ......... done
pkg-static: Missing dependency 'libxml2'


…granted, it *shouldn't* fail, it should find the libxml2 dependency, which of
course *was* added to RUN_DEPENDS at the port level, so something went wrong in
poudriere for me here. but I'm glad it did, because idk if anyone would've
found that issue otherwise.
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