Re: -Werror enabled by default on GNU/Hurd

  > with this patch I am now able to build GDB on GNU/Hurd (i686).  This
  > might help you out.

Thanks, that solves a warning.  But the build still fails with this
output:


  CXX    msg_U.o
cc1: warning: command-line option '-Wno-mismatched-tags' is valid for C++/ObjC++ but not for C
cc1: warning: command-line option '-Wsuggest-override' is valid for C++/ObjC++ but not for C
cc1: warning: command-line option '-Wdeprecated-copy' is valid for C++/ObjC++ but not for C
cc1: warning: command-line option '-Wdeprecated-copy-dtor' is valid for C++/ObjC++ but not for C
cc1: warning: command-line option '-Wredundant-move' is valid for C++/ObjC++ but not for C
cc1: warning: command-line option '-Wstrict-null-sentinel' is valid for C++/ObjC++ but not for C
msg_U.c: In function 'msg_set_init_ports':
msg_U.c:1044:22: error: conversion from 'unsigned int' to 'short unsigned int' changes value from '4294967295' to '65535' [-Werror=overflow]
 1044 |   /* msgtl_name = */ MACH_MSG_TYPE_POLYMORPHIC,
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~
msg_U.c: In function 'msg_set_dtable':
msg_U.c:1838:22: error: conversion from 'unsigned int' to 'short unsigned int' changes value from '4294967295' to '65535' [-Werror=overflow]
 1838 |   /* msgtl_name = */ MACH_MSG_TYPE_POLYMORPHIC,
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
Makefile:1684: recipe for target 'msg_U.o' failed
make: *** [msg_U.o] Error 1