[MacPorts] #65905: pango won't build, issue with clang ? (OSX BigSur, Xcode 13.2.1 )

[MacPorts]

#65905: pango won't build,  issue with clang ? (OSX BigSur, Xcode 13.2.1 )
---------------------------------+------------------------
  Reporter:  jamesstuartgunning  |      Owner:  ryandesign
      Type:  defect              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.7.2
Resolution:                      |   Keywords:
      Port:  pango               |
---------------------------------+------------------------

Comment (by ryandesign):

 Replying to [ticket:65905 jamesstuartgunning]:
 > {{{
 > :info:build warning: unknown -Werror warning specifier: '-Wno-error
 ,-Wimplicit-fallthrough' [-Wunknown-warning-option]
 > :info:build ../pango-1.50.7/pango/pangofc-fontmap.c:1684:43: error: use
 of undeclared identifier 'FC_VARIABLE'
 > :info:build                                           FC_VARIABLE,
 > :info:build                                           ^
 > :info:build ../pango-1.50.7/pango/pangofc-fontmap.c:1728:63: error: use
 of undeclared identifier 'FC_VARIABLE'
 > :info:build               variable = FcPatternGetBool
 (fontset->fonts[i], FC_VARIABLE, 0, &variable);
 > }}}

 As far as I can tell `FC_VARIABLE` was added in fontconfig 2.13.1 so it
 should exist. What version of fontconfig do you have installed? Try
 running:

 {{{
 port -v installed fontconfig
 /opt/local/bin/fc-cache --version
 }}}

 The version currently in MacPorts is 2.14.1.

 Please always attach the main.log file when you file a bug report.

 > It may be a clang issue with not implementing/using `-Wno-error
 ,-Wimplicit-fallthrough`?

 That doesn't matter here. `-Wno-error,-Wimplicit-fallthrough` instructs
 the compiler that, if it generates an implicit fallthrough warning, it
 should not consider that to be an error. In response, your compiler has
 warned you that it cannot generate an implicit fallthrough warning, which
 is fine.

-- 
Ticket URL: <https://trac.macports.org/ticket/65905#comment:3>
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