[MacPorts] #64427: libgphoto2: builds failing on some buildbots

[MacPorts]

#64427: libgphoto2: builds failing on some buildbots
---------------------+------------------------
 Reporter:  mascguy  |      Owner:  ryandesign
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:  libgphoto2
---------------------+------------------------
 This port is still failing to build on some of our buildbots:

 https://ports.macports.org/port/libgphoto2/builds/

 I'm also seeing similar local build failures, on macOS 10.12 through
 10.14.

 The compilation error appears (?) to be related to source file
 `pentax/js0n.c`:

 {{{
 libtool: compile:  /usr/bin/clang -DHAVE_CONFIG_H -I. -I..
 -D_GPHOTO2_INTERNAL_CODE -DLOCALEDIR=\"/opt/local/share/locale\"
 -DCAMLIBS=\"/opt/local/lib/libgphoto2/2.5.28\" -I.. -I..
 -I../libgphoto2_port -I/opt/local/include -Wno-unused -pipe -Os -arch
 x86_64 -Werror=unknown-warning-option -Wall -Wextra -Weverything -Wno-
 error=documentation-deprecated-sync -Wno-unused-parameter -DLIBGPHOTO2
 -DPKTDATADIR=\"/\" -pipe -Os -arch x86_64 -Werror=unknown-warning-option
 -Wall -Wextra -Weverything -Wno-error=documentation-deprecated-sync -Wno-
 unused-parameter -MT pentax/la-js0n.lo -MD -MP -MF pentax/.deps/la-
 js0n.Tpo -c pentax/js0n.c  -fno-common -DPIC -o pentax/.libs/la-js0n.o

 pentax/js0n.c:14:32: error: unknown warning group '-Woverride-init',
 ignored [-Werror,-Wunknown-warning-option]
 }}}

 Blacklisting Clang versions prior to 1001 fixes the issue locally, though
 that's not ideal.

 The best approach might be to simply eliminate the use of compiler option
 `-Werror=unknown-warning-option`. But I haven't had a chance to test that
 theory, and it's unclear whether that's the only issue.

 Alternatively, perhaps this might come down to the declared compiler
 standard needed? (That's a bit of a stretch, though.)

 But all of the above is speculation, as I haven't had much time to dig
 into this.

-- 
Ticket URL: <https://trac.macports.org/ticket/64427>
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