[Bug modula2/107611] New: mc-boot-ch/Gtermios.cc etc. don't compile on Mac OS X 10.7

["ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107611

            Bug ID: 107611
           Summary: mc-boot-ch/Gtermios.cc etc. don't compile on Mac OS X
                    10.7
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: modula2
          Assignee: gaius at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-apple-darwin11.4.2
            Target: x86_64-apple-darwin11.4.2
             Build: x86_64-apple-darwin11.4.2

Created attachment 53867
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53867&action=edit
Proposed patch

When trying to build the current devel/modula-2 branch on Mac OS X 10.7, it
failed to compile mc-boot-ch/Gtermios.cc, pge-boot/Gtermios.cc, and
gm2-libs-ch/termios.c:

/vol/gcc/src/hg/master/modula-2/gcc/m2/mc-boot-ch/Gtermios.cc: In function 'int
termios_SetFlag(termios*, Flag, int)':
/vol/gcc/src/hg/master/modula-2/gcc/m2/mc-boot-ch/Gtermios.cc:1091:26: error:
cannot convert 'tcflag_t*' {aka 'long unsigned int*'} to 'unsigned int*'
 1091 |       return doSetUnset (&t->c_iflag, IGNBRK, b);
      |                          ^~~~~~~~~~~
      |                          |
      |                          tcflag_t* {aka long unsigned int*}
/vol/gcc/src/hg/master/modula-2/gcc/m2/mc-boot-ch/Gtermios.cc:168:27: note:  
initializing argument 1 of 'int doSetUnset(unsigned int*, unsigned int, int)'
  168 | doSetUnset (unsigned int *bitset, unsigned int mask, int value)
      |            
and many more instances of the same.

As the error says, tcflag_t is unsigned long on that Darwin version.

The fix is easy: just don't make doSetUnset assume the type of tcflag_t, but
use the correct type directly.  This is what the attached patch does, which
allows the build to continue.