[MacPorts] #69471: gtk2 @2.24.33_3+quartz fails to build: incompatible function pointer types

[MacPorts]

#69471: gtk2 @2.24.33_3+quartz fails to build: incompatible function pointer types
------------------------+----------------------
  Reporter:  DrLex0     |      Owner:  mascguy
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.9.1
Resolution:             |   Keywords:
      Port:  gtk2 gimp  |
------------------------+----------------------

Comment (by ryandesign):

 Replying to [ticket:69471 DrLex0]:
 > For some reason the gtk2 build always causes the “Install Command Line
 Developer Tools.app” to be launched, claiming that “The "m4" command
 requires the command line developer tools,” even though they are already
 installed.

 We had another report of this in #69467 yesterday, also using Xcode 15.3,
 but this error is new to me. Xcode 15.3 was just released five days ago.
 Maybe Apple broke something in this version of Xcode. I made a suggestion
 in comment:ticket:69467:2 for how to possibly avoid this message. Let us
 know if that eliminates that message, and whether it improves the gtk2
 build problem, being sure to clean gtk2 before trying again. If you just
 want to work around the problem without spending time investigating, you
 could downgrade to Xcode 15.2. If you do that, also downgrade to the Xcode
 15.2 version of the command line tools to maintain a matched set.

 > The gtk2 build fails; digging into the log reveals this error:
 > {{{
 > :info:build gtkscale.c:1474:50: error: incompatible function pointer
 types passing 'GCompareFunc' (aka 'int (*)(const void *, const void *)')
 to parameter of type 'GCompareDataFunc' (aka 'int (*)(const void *, const
 void *, void *)') [-Wincompatible-function-pointer-types]
 > :info:build
 (GCompareFunc) compare_marks,
 > :info:build
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
 > :info:build /opt/local/include/glib-2.0/glib/gslist.h:76:26: note:
 passing argument to parameter 'func' here
 > :info:build                                           GCompareDataFunc
 func,
 > }}}
 > Full build log attached.
 >
 > Absolutely nothing to be found about this (but maybe that's just because
 Google is useless nowadays).
 > I can't be the first trying to install gtk2 +quartz in Sonoma?

 We have had successful [https://ports.macports.org/port/gtk2/builds/
 automated builds of gtk2] without +quartz on all macOS versions including
 Sonoma but we don't do automated builds of non-default variants and we're
 not using Xcode 15.3 on our build machines yet. This error may be new in
 the version of clang included in Xcode 15.3.

-- 
Ticket URL: <https://trac.macports.org/ticket/69471#comment:4>
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