Improve configure cache file handling.

- Add a version number to the configure cache file.
- Disable configure cache file in non-interactive mode.
- Rename configure cache file to .configure.cache to avoid 2.0 files.
- Use run_test to produce the "reading .configure.cache" message.

.gitignore

@@ -2,9 +2,9 @@
 *.pem
 *.swp
 
-/.config.cache
-/.gdbargs
-/.modulemanager
+.*
+!.git*
+
 /BSDmakefile
 /GNUmakefile
 /build

configure

@@ -119,10 +119,17 @@ our $interactive = !(
 my %version = get_version();
 print_format "<|BOLD Configuring InspIRCd $version{MAJOR}.$version{MINOR}.$version{PATCH}+$version{LABEL} on $^O.|>\n";
 
-our %config = read_configure_cache();
-
-print "Checking for cache from previous configure... ";
-print %config ? "found\n" : "not found\n";
+our %config;
+if ($interactive) {
+	%config = read_configure_cache();
+	run_test CONFIGURE_CACHE_FILE, %config;
+	if (!defined $config{VERSION}) {
+		$config{VERSION} = CONFIGURE_CACHE_VERSION;
+	} elsif ($config{VERSION} != CONFIGURE_CACHE_VERSION) {
+		print_warning "ignoring contents of ${\CONFIGURE_CACHE_FILE} as it was generated by an incompatible version of $0!";
+		%config = ('VERSION', CONFIGURE_CACHE_VERSION);
+	}
+}
 
 $config{CXX} = defined $ENV{CXX} && !system("$ENV{CXX} -v > /dev/null 2>&1") ? $ENV{CXX} : find_compiler();
 if ($config{CXX} eq "") {
@@ -290,7 +297,7 @@ if (<src/modules/m_ssl_*.cpp> && prompt_bool $interactive, 'Would you like to ge
 	system './tools/genssl', 'auto';
 }
 
-write_configure_cache %config;
+write_configure_cache %config if $interactive;
 parse_templates \%config, \%compiler;
 
 print_format <<"EOM";

make/configure.pm

@@ -37,7 +37,12 @@ use File::Basename qw(basename);
 use make::console;
 use make::utilities;
 
-our @EXPORT = qw(cmd_clean
+use constant CONFIGURE_CACHE_FILE    => '.configure.cache';
+use constant CONFIGURE_CACHE_VERSION => '1';
+
+our @EXPORT = qw(CONFIGURE_CACHE_FILE
+                 CONFIGURE_CACHE_VERSION
+                 cmd_clean
                  cmd_help
                  cmd_update
                  read_configure_cache
@@ -81,6 +86,7 @@ sub __get_template_settings($$) {
 	}
 
 	# Miscellaneous information
+	$settings{CONFIGURE_CACHE_FILE} = CONFIGURE_CACHE_FILE;
 	$settings{SYSTEM_NAME} = lc $^O;
 	chomp($settings{SYSTEM_NAME_VERSION} = `uname -sr 2>/dev/null`);
 
@@ -88,7 +94,7 @@ sub __get_template_settings($$) {
 }
 
 sub cmd_clean {
-	unlink '.config.cache';
+	unlink CONFIGURE_CACHE_FILE;
 }
 
 sub cmd_help {
@@ -159,7 +165,7 @@ EOH
 }
 
 sub cmd_update {
-	print_error "You have not run $0 before. Please do this before trying to update the generated files." unless -f '.config.cache';
+	print_error "You have not run $0 before. Please do this before trying to update the generated files." unless -f CONFIGURE_CACHE_FILE;
 	print "Updating...\n";
 	my %config = read_configure_cache();
 	my %compiler = get_compiler_info($config{CXX});
@@ -169,23 +175,23 @@ sub cmd_update {
 }
 
 sub read_configure_cache {
-	my %cfg = ();
-	open(CACHE, '.config.cache') or return %cfg;
+	my %config;
+	open(CACHE, CONFIGURE_CACHE_FILE) or return %config;
 	while (my $line = <CACHE>) {
 		next if $line =~ /^\s*($|\#)/;
 		my ($key, $value) = ($line =~ /^(\S+)="(.*)"$/);
-		$cfg{$key} = $value;
+		$config{$key} = $value;
 	}
 	close(CACHE);
-	return %cfg;
+	return %config;
 }
 
 sub write_configure_cache(%) {
-	print_format "Writing <|GREEN .config.cache|> ...\n";
-	my %cfg = @_;
-	open(CACHE, '>.config.cache') or print_error "unable to write .config.cache: $!";
-	while (my ($key, $value) = each %cfg) {
-		$value = "" unless defined $value;
+	print_format "Writing <|GREEN ${\CONFIGURE_CACHE_FILE}|> ...\n";
+	my %config = @_;
+	open(CACHE, '>', CONFIGURE_CACHE_FILE) or print_error "unable to write ${\CONFIGURE_CACHE_FILE}: $!";
+	while (my ($key, $value) = each %config) {
+		$value = '' unless defined $value;
 		print CACHE "$key=\"$value\"\n";
 	}
 	close(CACHE);

make/template/main.mk

@@ -261,7 +261,10 @@ install: target
 	@echo 'Remember to create your config file:' $(CONPATH)/inspircd.conf
 	@echo 'Examples are available at:' $(CONPATH)/examples/
 
-GNUmakefile BSDmakefile: make/template/main.mk src/version.sh configure .config.cache
+@TARGET BSD_MAKE CONFIGURE_CACHE_FILE = @CONFIGURE_CACHE_FILE@
+@TARGET GNU_MAKE CONFIGURE_CACHE_FILE = $(wildcard @CONFIGURE_CACHE_FILE@)
+
+GNUmakefile BSDmakefile: make/template/main.mk src/version.sh configure $(CONFIGURE_CACHE_FILE)
 	./configure -update
 @TARGET BSD_MAKE .MAKEFILEDEPS: BSDmakefile
 
@@ -284,7 +287,6 @@ deinstall:
 	-rm -f $(BASE)/org.inspircd.plist
 
 configureclean:
-	rm -f .config.cache
 	rm -f BSDmakefile
 	rm -f GNUmakefile
 	rm -f include/config.h
@@ -293,6 +295,7 @@ configureclean:
 	rm -f inspircd-genssl.1
 	-rm -f inspircd.service
 	-rm -f org.inspircd.plist
+	-rm -f @CONFIGURE_CACHE_FILE@
 
 distclean: clean configureclean
 	-rm -rf $(SOURCEPATH)/run