[MacPorts] #72353: g++ compiler broken after updating to CLT16.3

[MacPorts]

#72353: g++ compiler broken after updating to CLT16.3
----------------------+--------------------------
 Reporter:  luillo76  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  gcc13, gcc14
----------------------+--------------------------
 Following the update to CLT16.3, the g++ compiler does not work any more.

 The compilation of this simple file
 {{{
 #include <iostream>

 int main()
 {
     return 0;
 }
 }}}

 raises the following error.


 {{{
 $ > g++ --version
 g++ (MacPorts gcc14 14.2.0_3+stdlib_flag) 14.2.0
 $ > g++ test.cpp
 In file included from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/machine/_structs.h:35,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/arm/_mcontext.h:36,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/machine/_mcontext.h:34,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/sys/signal.h:146,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/sys/wait.h:109,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/_stdlib.h:70,
                  from
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/stdlib.h:58,
                  from /opt/local/include/gcc14/c++/cstdlib:79,
                  from
 /opt/local/include/gcc14/c++/ext/string_conversions.h:43,
                  from
 /opt/local/include/gcc14/c++/bits/basic_string.h:4154,
                  from /opt/local/include/gcc14/c++/string:54,
                  from
 /opt/local/include/gcc14/c++/bits/locale_classes.h:40,
                  from /opt/local/include/gcc14/c++/bits/ios_base.h:41,
                  from /opt/local/include/gcc14/c++/ios:44,
                  from /opt/local/include/gcc14/c++/ostream:40,
                  from /opt/local/include/gcc14/c++/iostream:41,
                  from test.cpp:1:
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:627:35:
 error: expected primary-expression before 'unsigned'
   627 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                                   ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:627:26:
 error: '_Alignof' was not declared in this scope
   627 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                          ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:633:35:
 error: expected primary-expression before 'unsigned'
   633 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                                   ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:633:26:
 error: '_Alignof' was not declared in this scope
   633 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                          ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:639:35:
 error: expected primary-expression before 'unsigned'
   639 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                                   ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:639:26:
 error: '_Alignof' was not declared in this scope
   639 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                          ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:645:35:
 error: expected primary-expression before 'unsigned'
   645 | } __attribute__((aligned(_Alignof(unsigned int))));
       |                                   ^~~~~~~~
 /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:645:26:
 error: '_Alignof' was not declared in this scope
   645 | } __attribute__((aligned(_Alignof(unsigned int))));

 }}}


 Reinstalling gcc port from source `sudo port -ns upgrade --force gcc13`
 returns the same error.

-- 
Ticket URL: <https://trac.macports.org/ticket/72353>
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