[PATCH] Enable maintainer mode for sim

[Tom Tromey <tromey@adacore.com>]

The sim's recently switch to using Automake caused a build failure for
me, because I didn't have the correct auto* tools in my path.
However, the rule in the tree is that this is not needed in general.
This patch adds a call to AM_MAINTAINER_MODE, to align the sim with
the way the rest of the tree works here.

sim/ChangeLog
2021-03-08  Tom Tromey  <tromey@adacore.com>

	* aclocal.m4, configure, Makefile.in: Rebuild.
	* configure.ac: Use AM_MAINTAINER_MODE.
---
 sim/ChangeLog    |  5 +++++
 sim/Makefile.in  |  7 ++++---
 sim/aclocal.m4   | 46 +++++++++++++++++++++++++++++++++-------------
 sim/configure    | 37 +++++++++++++++++++++++++++++++++++++
 sim/configure.ac |  1 +
 5 files changed, 80 insertions(+), 16 deletions(-)

diff --git a/sim/Makefile.in b/sim/Makefile.in
index 390a8575a75..85849f2745c 100644
--- a/sim/Makefile.in
+++ b/sim/Makefile.in
@@ -224,6 +224,7 @@ LDFLAGS = @LDFLAGS@
 LIBOBJS = @LIBOBJS@
 LIBS = @LIBS@
 LTLIBOBJS = @LTLIBOBJS@
+MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
 OBJEXT = @OBJEXT@
@@ -308,7 +309,7 @@ all: all-recursive
 .SUFFIXES:
 am--refresh: Makefile
 	@:
-$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am $(srcdir)/testsuite/local.mk $(am__configure_deps)
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am $(srcdir)/testsuite/local.mk $(am__configure_deps)
 	@for dep in $?; do \
 	  case '$(am__configure_deps)' in \
 	    *$$dep*) \
@@ -335,9 +336,9 @@ $(srcdir)/testsuite/local.mk $(am__empty):
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
 	$(SHELL) ./config.status --recheck
 
-$(top_srcdir)/configure:  $(am__configure_deps)
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
 	$(am__cd) $(srcdir) && $(AUTOCONF)
-$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
 	$(am__cd) $(srcdir) && $(ACLOCAL) $(ACLOCAL_AMFLAGS)
 $(am__aclocal_m4_deps):
 
diff --git a/sim/aclocal.m4 b/sim/aclocal.m4
index df8ff837794..e01194da383 100644
--- a/sim/aclocal.m4
+++ b/sim/aclocal.m4
@@ -626,24 +626,41 @@ if test x"${install_sh+set}" != xset; then
 fi
 AC_SUBST([install_sh])])
 
-# Copyright (C) 2003-2017 Free Software Foundation, Inc.
+# Add --enable-maintainer-mode option to configure.         -*- Autoconf -*-
+# From Jim Meyering
+
+# Copyright (C) 1996-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# Check whether the underlying file-system supports filenames
-# with a leading dot.  For instance MS-DOS doesn't.
-AC_DEFUN([AM_SET_LEADING_DOT],
-[rm -rf .tst 2>/dev/null
-mkdir .tst 2>/dev/null
-if test -d .tst; then
-  am__leading_dot=.
-else
-  am__leading_dot=_
-fi
-rmdir .tst 2>/dev/null
-AC_SUBST([am__leading_dot])])
+# AM_MAINTAINER_MODE([DEFAULT-MODE])
+# ----------------------------------
+# Control maintainer-specific portions of Makefiles.
+# Default is to disable them, unless 'enable' is passed literally.
+# For symmetry, 'disable' may be passed as well.  Anyway, the user
+# can override the default with the --enable/--disable switch.
+AC_DEFUN([AM_MAINTAINER_MODE],
+[m4_case(m4_default([$1], [disable]),
+       [enable], [m4_define([am_maintainer_other], [disable])],
+       [disable], [m4_define([am_maintainer_other], [enable])],
+       [m4_define([am_maintainer_other], [enable])
+        m4_warn([syntax], [unexpected argument to AM@&t@_MAINTAINER_MODE: $1])])
+AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
+  dnl maintainer-mode's default is 'disable' unless 'enable' is passed
+  AC_ARG_ENABLE([maintainer-mode],
+    [AS_HELP_STRING([--]am_maintainer_other[-maintainer-mode],
+      am_maintainer_other[ make rules and dependencies not useful
+      (and sometimes confusing) to the casual installer])],
+    [USE_MAINTAINER_MODE=$enableval],
+    [USE_MAINTAINER_MODE=]m4_if(am_maintainer_other, [enable], [no], [yes]))
+  AC_MSG_RESULT([$USE_MAINTAINER_MODE])
+  AM_CONDITIONAL([MAINTAINER_MODE], [test $USE_MAINTAINER_MODE = yes])
+  MAINT=$MAINTAINER_MODE_TRUE
+  AC_SUBST([MAINT])dnl
+]
+)
 
 # Check to see how 'make' treats includes.	            -*- Autoconf -*-
 
@@ -1150,3 +1167,6 @@ AC_SUBST([am__tar])
 AC_SUBST([am__untar])
 ]) # _AM_PROG_TAR
 
+m4_include([../config/depstand.m4])
+m4_include([../config/lead-dot.m4])
+m4_include([../config/override.m4])
diff --git a/sim/configure b/sim/configure
index 09c2a4793cd..707a1cc6c02 100755
--- a/sim/configure
+++ b/sim/configure
@@ -640,6 +640,9 @@ am__isrc
 INSTALL_DATA
 INSTALL_SCRIPT
 INSTALL_PROGRAM
+MAINT
+MAINTAINER_MODE_FALSE
+MAINTAINER_MODE_TRUE
 target_os
 target_vendor
 target_cpu
@@ -693,6 +696,7 @@ SHELL'
 ac_subst_files=''
 ac_user_opts='
 enable_option_checking
+enable_maintainer_mode
 enable_silent_rules
 enable_dependency_tracking
 enable_sim
@@ -1356,6 +1360,9 @@ Optional Features:
   --disable-option-checking  ignore unrecognized --enable/--with options
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --enable-maintainer-mode
+                          enable make rules and dependencies not useful (and
+                          sometimes confusing) to the casual installer
   --enable-silent-rules   less verbose build output (undo: "make V=1")
   --disable-silent-rules  verbose build output (undo: "make V=0")
   --enable-dependency-tracking
@@ -1882,6 +1889,9 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
+
+
+
 ac_aux_dir=
 for ac_dir in "$srcdir" "$srcdir/.." "$srcdir/../.."; do
   if test -f "$ac_dir/install-sh"; then
@@ -2023,6 +2033,29 @@ test -n "$target_alias" &&
   program_prefix=${target_alias}-
 
 
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable maintainer-specific portions of Makefiles" >&5
+$as_echo_n "checking whether to enable maintainer-specific portions of Makefiles... " >&6; }
+    # Check whether --enable-maintainer-mode was given.
+if test "${enable_maintainer_mode+set}" = set; then :
+  enableval=$enable_maintainer_mode; USE_MAINTAINER_MODE=$enableval
+else
+  USE_MAINTAINER_MODE=no
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $USE_MAINTAINER_MODE" >&5
+$as_echo "$USE_MAINTAINER_MODE" >&6; }
+   if test $USE_MAINTAINER_MODE = yes; then
+  MAINTAINER_MODE_TRUE=
+  MAINTAINER_MODE_FALSE='#'
+else
+  MAINTAINER_MODE_TRUE='#'
+  MAINTAINER_MODE_FALSE=
+fi
+
+  MAINT=$MAINTAINER_MODE_TRUE
+
+
 am__api_version='1.15'
 
 # Find a good install program.  We prefer a C program (faster),
@@ -5097,6 +5130,10 @@ LIBOBJS=$ac_libobjs
 LTLIBOBJS=$ac_ltlibobjs
 
 
+if test -z "${MAINTAINER_MODE_TRUE}" && test -z "${MAINTAINER_MODE_FALSE}"; then
+  as_fn_error $? "conditional \"MAINTAINER_MODE\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking that generated files are newer than configure" >&5
 $as_echo_n "checking that generated files are newer than configure... " >&6; }
    if test -n "$am_sleep_pid"; then
diff --git a/sim/configure.ac b/sim/configure.ac
index 23478521e94..709bd3ea9dc 100644
--- a/sim/configure.ac
+++ b/sim/configure.ac
@@ -7,6 +7,7 @@ AC_INIT([sim], [0],
 
 AC_CANONICAL_SYSTEM
 
+AM_MAINTAINER_MODE
 AM_INIT_AUTOMAKE
 
 AC_PROG_CC
-- 
2.26.2