r7859: Merge a few scripts to one script that checks for the following unused

(used in configure.in, but their output is never used) autoconf macros:
- AC_DEFINE
- AC_CHECK_FUNC
- AC_CHECK_FUNCS
- AC_CHECK_HEADER
- AC_CHECK_HEADERS
(This used to be commit 897d7b7d390815778adea1adf5e73b94f75a3048)

1 files changed, 120 insertions, 0 deletions

diff --git a/source4/script/configure_check_unused.pl b/source4/script/configure_check_unused.pl
new file mode 100755
index 0000000000..1b33a9e6b1
--- /dev/null
+++ b/source4/script/configure_check_unused.pl
@@ -0,0 +1,120 @@
+#!/usr/bin/perl
+# Script that finds macros in a configure script that are not 
+# used in a set of C files.
+# Copyright Jelmer Vernooij <jelmer@samba.org>, GPL
+#
+# Usage: ./$ARGV[0] configure.in [c-files...]
+
+use strict;
+
+sub autoconf_parse($$$$)
+{
+	my $in = shift;
+	my $defines = shift;
+	my $functions = shift;
+	my $headers = shift;
+
+	open(IN, $in) or die("Can't open $in");
+
+	my $ln = 0;
+
+	foreach(<IN>) {
+		$ln++;
+
+		if(/AC_DEFINE\(([^,]+),/) { 
+			$defines->{$1} = "$in:$ln";
+		} 
+	
+		if(/AC_CHECK_FUNCS\(\[*(.[^],)]+)/) {
+			foreach(split / /, $1) { 
+				$functions->{$_} = "$in:$ln";
+			}
+		}
+
+		if(/AC_CHECK_FUNC\(([^,)]+)/) {
+			$functions->{$1} = "$in:$ln";
+		}
+
+		if(/AC_CHECK_HEADERS\(\[*([^],)]+)/) {
+			foreach(split / /, $1) { 
+				$headers->{$_} = "$in:$ln";
+			}
+		}
+
+		if(/AC_CHECK_HEADER\(([^,)]+)/) {
+			$headers->{$1} = "$in:$ln";
+		}
+
+		if(/sinclude\(([^,]+)\)/) {
+			autoconf_parse($1, $defines, $functions, $headers);
+		}
+	}
+
+	close IN;
+}
+
+# Return the symbols and headers used by a C file
+sub cfile_parse($$$)
+{
+	my $in = shift;
+	my $symbols = shift;
+	my $headers = shift;
+
+	open(FI, $in) or die("Can't open $in");
+	my $ln = 0;	
+	foreach(<FI>) { 
+		$ln++;
+		foreach(/\#([ \t]*)include ["<]([^">]+)/g) { 
+			$headers->{$2} = "$in:$ln";
+		}
+
+		foreach(/([A-Za-z0-9_]+)/g) { 
+			$symbols->{$1} = "$in:$ln";
+		}
+	}
+	close FI;
+}
+
+my %ac_defines = ();
+my %ac_func_checks = ();
+my %ac_headers = ();
+my %symbols = ();
+my %headers = ();
+
+if (scalar(@ARGV) <= 1) {
+	print("Usage: configure_find_unused.pl configure.in [CFILE...]\n");
+	exit 0;
+}
+
+autoconf_parse(shift(@ARGV), \%ac_defines, \%ac_func_checks, \%ac_headers);
+cfile_parse($_, \%symbols, \%headers) foreach(@ARGV);
+
+(keys %ac_defines) or warn("No defines found in configure.in file, parse error?");
+
+foreach (keys %ac_defines) {
+	if (not defined($symbols{$_})) {
+		print "$ac_defines{$_}: Autoconf-defined $_ is unused\n";
+	}
+}
+
+(keys %ac_func_checks) or warn("No function checks found in configure.in file, parse error?");
+
+foreach (keys %ac_func_checks) {
+	if (not defined($symbols{$_})) {
+		print "$ac_func_checks{$_}: Autoconf-checked function $_ is unused\n";
+	} elsif (not defined($symbols{"HAVE_".uc($_)})) {
+		print "$ac_func_checks{$_}: Autoconf-define for function $_ is unused\n";
+	}
+}
+
+(keys %ac_headers) or warn("No headers found in configure.in file, parse error?");
+
+foreach (keys %ac_headers) {
+	my $def = "HAVE_".uc($_);
+	$def =~ s/[\/\.]/_/g;
+	if (not defined($headers{$_})) {
+		print "$ac_headers{$_}: Autoconf-checked header $_ is unused\n";
+	} elsif (not defined($symbols{$def})) {
+		print "$ac_headers{$_}: Autoconf-define for header $_ is unused\n"; 
+	}
+}