[MacPorts] #67491: py-matplotlib fails to build with gcc: cc1obj: error: '-Werror=unguarded-availability': no option '-Wunguarded-availability'

[MacPorts]

#67491: py-matplotlib fails to build with gcc: cc1obj: error: '-Werror=unguarded-
availability': no option '-Wunguarded-availability'
----------------------------+--------------------
  Reporter:  barracuda156   |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:                 |   Keywords:
      Port:  py-matplotlib  |
----------------------------+--------------------

Comment (by barracuda156):

 The code is hopelessly broken.
 {{{
 building 'matplotlib.backends._macosx' extension
 creating build/temp.macosx-10.6-ppc-
 cpython-311/matplotlib.backends._macosx
 creating build/temp.macosx-10.6-ppc-
 cpython-311/matplotlib.backends._macosx/src
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_python_py-
 matplotlib/py311-matplotlib/work/compwrap/cc/opt/local/bin/gcc-mp-12 -fno-
 common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -pipe -Os
 -I/opt/local/Library/Frameworks/Python.framework/Versions/3.11/include/python3.11
 -c src/_macosx.m -o build/temp.macosx-10.6-ppc-
 cpython-311/matplotlib.backends._macosx/src/_macosx.o -arch ppc -isysroot/
 -fvisibility=hidden
 src/_macosx.m: In function 'FigureManager_init':
 src/_macosx.m:703:5: warning: 'Window' may not respond to
 '-backingScaleFactor'
   703 |     [view updateDevicePixelRatio: [window backingScaleFactor]];
       |     ^
 src/_macosx.m:703:5: warning: (messages without a matching method
 signature will be assumed to return 'id' and accept '...' as arguments)
 src/_macosx.m:703:5: error: incompatible type for argument 1 of
 'updateDevicePixelRatio:'
   703 |     [view updateDevicePixelRatio: [window backingScaleFactor]];
       |     ^
       |     |
       |     id
 src/_macosx.m:703:5: note: expected 'double' but argument is of type 'id'
 src/_macosx.m: In function 'FigureManager_resize':
 src/_macosx.m:799:9: warning: 'Window' may not respond to
 '-backingScaleFactor'
   799 |         CGFloat device_pixel_ratio = [window backingScaleFactor];
       |         ^~~~~~~
 src/_macosx.m:799:38: error: incompatible types when initializing type
 'CGFloat' {aka 'float'} using type 'id'
   799 |         CGFloat device_pixel_ratio = [window backingScaleFactor];
       |                                      ^
 src/_macosx.m: In function '-[View windowDidChangeBackingProperties:]':
 src/_macosx.m:1614:5: warning: 'Window' may not respond to
 '-backingScaleFactor'
  1614 |     [self updateDevicePixelRatio: [window backingScaleFactor]];
       |     ^
 src/_macosx.m:1614:5: error: incompatible type for argument 1 of
 'updateDevicePixelRatio:'
  1614 |     [self updateDevicePixelRatio: [window backingScaleFactor]];
       |     ^
       |     |
       |     id
 src/_macosx.m:1614:5: note: expected 'double' but argument is of type 'id'
 error: command '/opt/local/var/macports/build
 /_opt_PPCSnowLeopardPorts_python_py-
 matplotlib/py311-matplotlib/work/compwrap/cc/opt/local/bin/gcc-mp-12'
 failed with exit code 1
 Command failed:  cd "/opt/local/var/macports/build
 /_opt_PPCSnowLeopardPorts_python_py-
 matplotlib/py311-matplotlib/work/matplotlib-3.5.3" &&
 /opt/local/Library/Frameworks/Python.framework/Versions/3.11/bin/python3.11
 setup.py --no-user-cfg build
 Exit code: 1
 }}}

 That macOS extension, FWIW, should be just disabled when built with GCC.

-- 
Ticket URL: <https://trac.macports.org/ticket/67491#comment:1>
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