Add --enable-maintainer-mode configure option

Autoconf is tested for and run if needed only when --enable-maintainer-mode
is used on configure.  This results in the autom4te.cache directory only
being written in the source directory during configure if automatic
autoconf usage is requested.

Fixes BZ #14120.

ChangeLog

@@ -1,5 +1,10 @@
 2013-12-16  Allan McRae  <allan@archlinux.org>
 
+	[BZ #14120]
+	* configure.ac: Added --enable-maintainer-mode. Check for
+	autoconf when enabled.
+	* configure: Regenerated.
+
 	* nscd/nscd.service: New file.
 	* nscd/nscd.tmpfiles: New file.
 

configure

@@ -747,6 +747,7 @@ enable_hidden_plt
 enable_bind_now
 enable_static_nss
 enable_force_install
+enable_maintainer_mode
 enable_kernel
 enable_all_warnings
 enable_multi_arch
@@ -1408,6 +1409,9 @@ Optional Features:
   --enable-static-nss     build static NSS modules [default=no]
   --disable-force-install don't force installation of files from this package,
                           even if they are older than the installed files
+  --enable-maintainer-mode
+                          enable make rules and dependencies not useful (and
+                          sometimes confusing) to the casual installer
   --enable-kernel=VERSION compile for compatibility with kernel not older than
                           VERSION
   --enable-all-warnings   enable all useful warnings gcc can issue
@@ -3530,6 +3534,14 @@ fi
 
 
 
+# Check whether --enable-maintainer-mode was given.
+if test "${enable_maintainer_mode+set}" = set; then :
+  enableval=$enable_maintainer_mode; maintainer=$enableval
+else
+  maintainer=no
+fi
+
+
 # Check whether --enable-kernel was given.
 if test "${enable_kernel+set}" = set; then :
   enableval=$enable_kernel; minimum_kernel=$enableval
@@ -5120,6 +5132,7 @@ else
 fi
 
 
+if test "x$maintainer" = "xyes"; then
   for ac_prog in autoconf
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
@@ -5185,6 +5198,7 @@ esac
   if test "x$AUTOCONF" = xno; then
     aux_missing="$aux_missing autoconf"
   fi
+fi
 
 test -n "$critic_missing" && as_fn_error $? "
 *** These critical programs are missing or too old:$critic_missing

configure.ac

@@ -231,6 +231,12 @@ AC_ARG_ENABLE([force-install],
 	      [force_install=yes])
 AC_SUBST(force_install)
 
+AC_ARG_ENABLE([maintainer-mode],
+	      AC_HELP_STRING([--enable-maintainer-mode],
+			     [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
+	      [maintainer=$enableval],
+	      [maintainer=no])
+
 dnl On some platforms we allow dropping compatibility with all kernel
 dnl versions.
 AC_ARG_ENABLE([kernel],
@@ -1004,6 +1010,7 @@ AC_CHECK_PROG_VER(AWK, gawk, --version,
 
 AC_CHECK_TOOL(NM, nm, false)
 
+if test "x$maintainer" = "xyes"; then
   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
   case "x$AUTOCONF" in
   xno|x|x:) AUTOCONF=no ;;
@@ -1021,6 +1028,7 @@ esac
   if test "x$AUTOCONF" = xno; then
     aux_missing="$aux_missing autoconf"
   fi
+fi
 
 test -n "$critic_missing" && AC_MSG_ERROR([
 *** These critical programs are missing or too old:$critic_missing