[PATCH] Introduce "gdb/configure.nat" (and delete "gdb/config/*/*.mh" files)

[Simon Marchi]

> +++ b/gdb/configure.nat
> @@ -0,0 +1,591 @@
> +# Copyright (C) 2013-2017 Free Software Foundation, Inc.
> +#
> +# This file is part of GDB.
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 3 of the License, or
> +# (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see 
> <http://www.gnu.org/licenses/>.
> +
> +# Variables defined here:
> +#
> +# NAT_FILE
> +# NATDEPFILES
> +# NAT_CDEPS
> +# LOADLIBES
> +# MH_CFLAGS
> +# XM_CLIBS
> +# NAT_GENERATED_FILES
> +# HAVE_NATIVE_GCORE_HOST
> +# NAT_EXTRA_FRAGS_FILE

Could you document (if you know it) what each variable does?

> +# - To avoid shell expansion of variables, declare them with single
> +#   quotes.
> +#
> +# - NAT_EXTRA_FRAGS_FILE should contain the full path of the file.
> +
> +case ${gdb_host_cpu} in
> +  aarch64)
> +    case ${gdb_host} in
> +      linux)
> +	#  Host: AArch64 based machine running GNU/Linux
> +	NAT_FILE='config/nm-linux.h'
> +	NATDEPFILES='inf-ptrace.o fork-child.o aarch64-linux-nat.o
> aarch32-linux-nat.o \
> +		proc-service.o linux-thread-db.o linux-nat.o linux-fork.o \
> +		linux-procfs.o linux-ptrace.o linux-osdata.o linux-waitpid.o \
> +		linux-personality.o linux-namespaces.o aarch64-linux-hw-point.o \
> +		aarch64-linux.o'

IMO, the interest of having all of this in a single file is to be able 
to factor out common things.  A lot of NATDEPFILES are repeated Would it 
be possible to have a switch on ${gdb_host} at the top level, and 
specify all the files specific to OSes but machine-agnostic?  For 
example, fork-child.o and inf-ptrace.o probably appear in all the linux 
ports.

Thanks,

Simon