Remove unsupported build facilities.

Over time the non-standard build and install systems (nmake files,
smake files, Visual Studio project files, etc.) have atrophied and
maintaining them is not worth the effort, for such a simple utility
as make.  Remove all the non-standard build tool support and unify
OS-specific build rules under a basic set of (GNU make) makefiles.

Preserve the existing bootstrapping scripts (for POSIX, Windows,
and MS-DOS).  Also the existing VMS build scripts are left unchanged:
I don't have enough experience with VMS to venture into this area.
Perhaps one of the VMS maintainers might like to determine whether
conversion would be appropriate.

Rather than create libraries for w32 and glob (non-POSIX), simply
link the object files directly to remove the complexity.

* NEWS: Update with user-facing notes.
* Makefile.am: Clean up to use the latest automake best practices.
Build Windows code directly from the root makefile to avoid recursion.
* README.Amiga, README.DOS.template, README.W32.template: Updated.
* INSTALL: Point readers at the README.git file.
* maintMakefile: Remove obsolete files.  Create Basic.mk file.
* Basic.mk.template, mk/*.mk: Create basic GNU make-based makefiles.
* build_w32.bat: Copy Basic.mk to Makefile
* configure.ac: We no longer need AM_PROG_AR.
* dosbuild.bat: Rename to builddos.bat.  Incorporate configure.bat.
* Makefile.DOS.template: Remove.
* NMakefile.template, w32/subproc/NMakefile: Remove.
* SMakefile.template, glob/SMakefile, glob/SCOPTIONS, make.lnk: Remove.
* configure.bat, glob/configure.bat: Remove.
* w32/Makefile.am: Remove.
* make_msvc_net2003.sln, make_msvc_net2003.vcproj: Remove.

.gitignore

@@ -3,6 +3,7 @@ ID
 TAGS
 .*gdbinit
 .gdb_history
+.vscode
 *~
 #*
 .#*
@@ -11,6 +12,7 @@ TAGS
 ABOUT-NLS
 Makefile
 Makefile.in
+Basic.mk
 aclocal.m4
 autom4te.cache
 config.cache
@@ -44,13 +46,10 @@ GccRel/
 .dep_segment
 .check-git-HEAD
 ChangeLog
-Makefile.DOS
-NMakefile
 README
 README.DOS
 README.OS2
 README.W32
-SMakefile
 build.sh
 build.sh.in
 config.ami

Basic.mk.template

@@ -0,0 +1,103 @@
+# Basic GNU -*-Makefile-*- to build GNU make
+#
+# NOTE:
+# If you have no 'make' program at all to process this makefile:
+#   * On Windows, run ".\buildw32.bat" to bootstrap one.
+#   * On MS-DOS, run ".\builddos.bat" to bootstrap one.
+#
+# Once you have a GNU make program created, you can use it with this makefile
+# to keep it up to date if you make changes, as:
+#
+#   make.exe -f Makew32.mk
+#
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of GNU Make.
+#
+# GNU Make 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.
+#
+# GNU Make 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/>.
+
+all:
+
+make_SOURCES = %make_SOURCES% remote-stub.c
+glob_SOURCES = %glob_SOURCES%
+w32_SOURCES = %w32_SOURCES%
+vms_SOURCES = %vms_SOURCES%
+amiga_SOURCES = %amiga_SOURCES%
+
+OUTDIR = .
+SRCDIR = .
+
+OBJEXT = o
+EXEEXT =
+
+PROG = $(OUTDIR)/make$(EXEEXT)
+
+LD = $(CC)
+
+# Reserved for command-line override
+CPPFLAGS =
+CFLAGS = -g -O2
+LDFLAGS =
+
+prog_SOURCES = $(make_SOURCES)
+
+extra_CPPFLAGS = -DHAVE_CONFIG_H -I$(OUTDIR) -I$(SRCDIR)
+extra_CFLAGS =
+extra_LDFLAGS = $(extra_CFLAGS) $(CFLAGS)
+
+C_SOURCE = -c
+OUTPUT_OPTION = -o $@
+LINK_OUTPUT = -o $@
+
+# Command lines
+
+COMPILE.cmd = $(CC) $(extra_CFLAGS) $(CFLAGS) $(extra_CPPFLAGS) $(CPPFLAGS) $(TARGET_ARCH) $(OUTPUT_OPTION) $(C_SOURCE) $<
+
+LINK.cmd = $(LD) $(extra_LDFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) $(LINK_OUTPUT)
+
+CHECK.cmd = cd tests && ./run_make_tests -make $(shell cd $(<D) && pwd)/$(<F)
+
+MKDIR = mkdir -p
+MKDIR.cmd = $(MKDIR) $@
+
+RM = rm -f
+RM.cmd = $(RM) $(OBJECTS) $(PROG)
+
+# Load overrides for the above variables.
+include $(wildcard mk/$(lastword $(subst -, ,$(MAKE_HOST)).mk))
+
+VERSION = %VERSION%
+
+VPATH = $(SRCDIR)
+
+all: $(PROG)
+
+OBJECTS = $(patsubst %.c,$(OUTDIR)/%.$(OBJEXT),$(prog_SOURCES))
+
+$(PROG): $(OBJECTS)
+	$(LINK.cmd)
+
+.SECONDEXPANSION:
+$(OBJECTS): $(OUTDIR)/%.$(OBJEXT): %.c | $$(@D)/.
+	$(COMPILE.cmd)
+
+$(addsuffix .,$(sort $(dir $(OBJECTS)))):
+	$(MKDIR.cmd)
+
+check: $(PROG)
+	$(CHECK.cmd)
+
+clean:
+	$(RM.cmd)
+
+.PHONY: all check clean

INSTALL

@@ -7,6 +7,15 @@ Software Foundation, Inc.
 This file is free documentation; the Free Software Foundation gives
 unlimited permission to copy, distribute and modify it.
 
+Installation From Git
+=====================
+
+If you are trying to build GNU make from a Git clone rather than a
+downloaded source distribution file, see README.git for steps you
+must take to configure your workspace before you can use the
+instructions below.
+
+
 Basic Installation
 ==================
 
@@ -228,4 +237,3 @@ overridden in the site shell script).
 
 `configure' also accepts some other, not widely useful, options.  Run
 `configure --help' for more details.
-