Revert "Goodbye autogen.lastrun"

Welcome back autogen.lastrun. I just don't have the energy to convince
tinderbox maintainers to fix their scripts. Oh well.

This reverts commit 7496c833.

Makefile.in

@@ -46,6 +46,7 @@ $(BUILDDIR)/config_host.mk : $(wildcard \
 		$(SRCDIR)/configure.ac \
 		$(SRCDIR)/config_host/*.h.in \
 		$(BUILDDIR)/autogen.input \
+		$(BUILDDIR)/autogen.lastrun \
 		$(BUILDDIR)/autogen.sh \
 		) \
 		$(shell . $(SRCDIR)/bin/get_config_variables JAVA_HOME && \

autogen.sh

 :
 #
+# This script checks various configure parameters and uses three files:
+#   * autogen.input (ro)
+#   * autogen.lastrun (rw)
+#   * autogen.lastrun.bak (rw)
+#
 # If _no_ parameters:
-#   Read args from autogen.input
+#   Read args from autogen.input or autogen.lastrun
+# Else
+#   Backup autogen.lastrun as autogen.lastrun.bak
+#   Write autogen.lastrun with new commandline args
 #
 # Run configure with checked args
 #
@@ -178,7 +186,7 @@ unlink ("configure");
 system ("autoconf -I ${src_path}") && die "Failed to run autoconf";
 die "Failed to generate the configure script" if (! -f "configure");
 
-# Handle help arguments first
+# Handle help arguments first, so we don't clobber autogen.lastrun
 for my $arg (@ARGV) {
     if ($arg =~ /^(--help|-h|-\?)$/) {
         print STDOUT "autogen.sh - libreoffice configuration helper\n";
@@ -193,10 +201,24 @@ for my $arg (@ARGV) {
 my @cmdline_args = ();
 
 my $input = "autogen.input";
+my $lastrun = "autogen.lastrun";
 
 if (!@ARGV) {
     if (-f $input) {
+        if (-f $lastrun) {
+            print STDERR <<WARNING;
+********************************************************************
+*
+*   Reading $input and ignoring $lastrun!
+*   Consider removing $lastrun to get rid of this warning.
+*
+********************************************************************
+WARNING
+        }
         @cmdline_args = read_args ($input);
+    } elsif (-f $lastrun) {
+        print STDERR "Reading $lastrun. Please rename it to $input to avoid this message.\n";
+        @cmdline_args = read_args ($lastrun);
     }
 } else {
     if (-f $input) {
@@ -243,6 +265,27 @@ for my $arg (@args) {
 if (defined $ENV{NOCONFIGURE}) {
     print "Skipping configure process.";
 } else {
+    # Save autogen.lastrun only if we did get some arguments on the command-line
+    if (! -f $input && @ARGV) {
+        if (scalar(@cmdline_args) > 0) {
+            # if there's already an autogen.lastrun, make a backup first
+            if (-e $lastrun) {
+                open (my $fh, $lastrun) || warn "Can't open $lastrun.\n";
+                open (BAK, ">$lastrun.bak") || warn "Can't create backup file $lastrun.bak.\n";
+                while (<$fh>) {
+                    print BAK;
+                }
+                close (BAK) && close ($fh);
+            }
+            # print "Saving command-line args to $lastrun\n";
+            my $fh;
+            open ($fh, ">autogen.lastrun") || die "Can't open autogen.lastrun: $!";
+            for my $arg (@cmdline_args) {
+                print $fh "$arg\n";
+            }
+            close ($fh);
+        }
+    }
     push @args, "--srcdir=$src_path";
     push @args, "--enable-option-checking=$option_checking";