[MacPorts] #67235: giflib5 broken on <= 10.6: cc1: error: unrecognized command line option "-Wno-format-truncation"

[MacPorts]

#67235: giflib5 broken on <= 10.6: cc1: error: unrecognized command line option
"-Wno-format-truncation"
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  Schamschula
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  snowleopard, leopard, powerpc,
      Port:  giflib5     |  rosetta
-------------------------+-------------------------------------------------

Comment (by ryandesign):

 Well the Makefile says `CFLAGS =` which overwrites the environment
 variable the makefile portgroup sets. You can tell the makefile portgroup
 to use an arg instead of an env var, but that will then overwrite
 everything in the Makefile's `CFLAGS`, which also wouldn't be correct; we
 want a combination of MacPorts flags and the ones the Makefile wants. The
 best solution is probably to patch the Makefile so that it says `CFLAGS
 +=`, so that it appends to the flags the portgroup sets. This is a matter
 to bring to the attention of the developers.

 In addition, this Makefile wants the optimization flags specified
 separtely in `OFLAGS`, so you could do that by adding:
 {{{
 configure.args-append OFLAGS="${configure.optflags}"
 }}}
 A revbump should go along with that.

-- 
Ticket URL: <https://trac.macports.org/ticket/67235#comment:6>
MacPorts <https://www.macports.org/>
Ports system for macOS