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|
#!/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";
}
}
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