[MacPorts] #64162: gcc11 @11.2.0_2 cannot be used on macOS 12.0.1, Monterey, at least not outside of MacPorts

[MacPorts]

#64162: gcc11 @11.2.0_2 cannot be used on macOS 12.0.1, Monterey, at least not
outside of MacPorts
-----------------------+--------------------
 Reporter:  ballapete  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.7.1
 Keywords:  monterey   |       Port:  gcc11
-----------------------+--------------------
 `GNU Emacs 28.0.90 and 29.0.50` (`port emacs-devel`) show a bug when
 compiled on Monterey: the calendar mode-line has a white background where
 the "buttons" `?`, `.`, or `o` are. This happens in X11 and also for the
 NS variant (without metal). The attached screenshot shows it. OK looks
 `GNU Emacs 28.0.50 – compiled on Big Sur`.

 So I want to see whether this issue comes from the macOS or from the
 compiler or from the version of GNU Emacs. `Clang 13`, which seems to work
 OK on Monterey, makes this bug appear. Trying to use `GCC 11` (`GCC 10`
 does not yet build on Monterey) the `configure` stage fails here:

 {{{
 checking AppKit/AppKit.h usability... no
 checking AppKit/AppKit.h presence... yes
 configure: WARNING: AppKit/AppKit.h: present but cannot be compiled
 configure: WARNING: AppKit/AppKit.h:     check for missing prerequisite
 headers?
 configure: WARNING: AppKit/AppKit.h: see the Autoconf documentation
 configure: WARNING: AppKit/AppKit.h:     section "Present But Cannot Be
 Compiled"
 configure: WARNING: AppKit/AppKit.h: proceeding with the compiler's result
 configure: WARNING:     ## ------------------------------------ ##
 configure: WARNING:     ## Report this to bug-gnu-emacs at gnu.org ##
 configure: WARNING:     ## ------------------------------------ ##
 checking for AppKit/AppKit.h... no
 configure: error: The include files (AppKit/AppKit.h etc) that
 are required for a Nextstep build are missing or cannot be compiled.
 Either fix this, or re-configure with the option '--without-ns'.
 }}}

 Since I am `configuring with `CFLAGS=-H` I can see which C header files
 are used to compile the test files, for which I am using:

 {{{
 gcc version 11.2.0 (MacPorts gcc11 11.2.0_2)
 COLLECT_GCC_OPTIONS='-g' '-H' '-pipe' '-fPIC' '-fno-common' '-Os' '-fomit-
 frame-pointer' '-I' '/opt/local/include' '-v' '-L/opt/local/lib' '-m64'
 '-mmacosx-version-min=12.0.0'  '-mtune=core2' '-dumpdir' 'a-'
  /opt/local/libexec/gcc/x86_64-apple-darwin21/11.2.0/cc1 -quiet -v -I
 /opt/local/include -H -D__DYNAMIC__ conftest.c -fPIC -feliminate-unused-
 debug-symbols -quiet -dumpdir a- -dumpbase conftest.c -dumpbase-ext .c
 -m64 -mmacosx-version-min=12.0.0 -mtune=core2 -g -Os -version -fPIC -fno-
 common -fomit-frame-pointer -o - |
  /opt/local/bin/as -arch x86_64 -v -I /opt/local/include
 -force_cpusubtype_ALL -mmacosx-version-min=12.0 -o
 /var/folders/dq/9fbvqzn50cs6znm9h1vd3l6w0000gp/T//ccUWGV5C.o
 GNU C17 (MacPorts gcc11 11.2.0_2) version 11.2.0 (x86_64-apple-darwin21)
         compiled by GNU C version 11.2.0, GMP version 6.2.1, MPFR version
 4.1.0, MPC version 1.2.1, isl version isl-0.22.1-GMP
 }}}

 {{{
 ...
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h
 .... /opt/local/lib/gcc11/gcc/x86_64-apple-darwin21/11.2.0/include-
 fixed/limits.h
 In file included from
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/AppKit.framework/Headers/AppKit.h:10,
                  from conftest.c:105:
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:559:29:
 error: expected identifier or '(' before '^' token
   559 | typedef NSComparisonResult (^NSComparator)(id obj1, id obj2);
       |                             ^
 ...
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h
 ....
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h
 .....
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h
 ...... /opt/local/lib/gcc11/gcc/x86_64-apple-
 darwin21/11.2.0/include/stddef.h
 In file included from
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/AppKit.framework/Headers/AppKit.h:10,
                  from conftest.c:105:
 /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:19:21:
 error: unknown type name 'nullable'
    19 | - (id)copyWithZone:(nullable NSZone *)zone;
       |                     ^~~~~~~~
 }}}

 This is just the start of a very long list of errors (36 k lines) that I
 am attaching. C++ or Objective C are not my languages

-- 
Ticket URL: <https://trac.macports.org/ticket/64162>
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