script/configure_check_unused.pl

   1 #!/usr/bin/perl
   2 # Script that finds macros in a configure script that are not
   3 # used in a set of C files.
   4 # Copyright Jelmer Vernooij <jelmer@samba.org>, GPL
   5 #
   6 # Usage: ./$ARGV[0] configure.in [c-files...]
   7
   8 use strict;
   9
  10 sub autoconf_parse($$$$)
  11 {
  12         my $in = shift;
  13         my $defines = shift;
  14         my $functions = shift;
  15         my $headers = shift;
  16
  17         open(IN, $in) or die("Can't open $in");
  18
  19         my $ln = 0;
  20
  21         foreach(<IN>) {
  22                 $ln++;
  23
  24                 if(/AC_DEFINE\(([^,]+),/) {
  25                         $defines->{$1} = "$in:$ln";
  26                 }
  27
  28                 if(/AC_CHECK_FUNCS\(\[*(.[^],)]+)/) {
  29                         foreach(split / /, $1) {
  30                                 $functions->{$_} = "$in:$ln";
  31                         }
  32                 }
  33
  34                 if(/AC_CHECK_FUNC\(([^,)]+)/) {
  35                         $functions->{$1} = "$in:$ln";
  36                 }
  37
  38                 if(/AC_CHECK_HEADERS\(\[*([^],)]+)/) {
  39                         foreach(split / /, $1) {
  40                                 $headers->{$_} = "$in:$ln";
  41                         }
  42                 }
  43
  44                 if(/AC_CHECK_HEADER\(([^,)]+)/) {
  45                         $headers->{$1} = "$in:$ln";
  46                 }
  47
  48                 if(/sinclude\(([^,]+)\)/) {
  49                         autoconf_parse($1, $defines, $functions, $headers);
  50                 }
  51         }
  52
  53         close IN;
  54 }
  55
  56 # Return the symbols and headers used by a C file
  57 sub cfile_parse($$$)
  58 {
  59         my $in = shift;
  60         my $symbols = shift;
  61         my $headers = shift;
  62
  63         open(FI, $in) or die("Can't open $in");
  64         my $ln = 0;
  65         my $line;
  66         while($line = <FI>) {
  67                 $ln++;
  68                 $_ = $line;
  69                 if (/\#([ \t]*)include ["<]([^">]+)/) {
  70                         $headers->{$2} = "$in:$ln";
  71                 }
  72
  73                 $_ = $line;
  74                 while(/([A-Za-z0-9_]+)/g) {
  75                         $symbols->{$1} = "$in:$ln";
  76                 }
  77         }
  78         close FI;
  79 }
  80
  81 my %ac_defines = ();
  82 my %ac_func_checks = ();
  83 my %ac_headers = ();
  84 my %symbols = ();
  85 my %headers = ();
  86
  87 if (scalar(@ARGV) <= 1) {
  88         print("Usage: configure_find_unused.pl configure.in [CFILE...]\n");
  89         exit 0;
  90 }
  91
  92 autoconf_parse(shift(@ARGV), \%ac_defines, \%ac_func_checks, \%ac_headers);
  93 cfile_parse($_, \%symbols, \%headers) foreach(@ARGV);
  94
  95 (keys %ac_defines) or warn("No defines found in configure.in file, parse error?");
  96
  97 foreach (keys %ac_defines) {
  98         if (not defined($symbols{$_})) {
  99                 print "$ac_defines{$_}: Autoconf-defined $_ is unused\n";
 100         }
 101 }
 102
 103 (keys %ac_func_checks) or warn("No function checks found in configure.in file, parse error?");
 104
 105 foreach (keys %ac_func_checks) {
 106         my $def = "HAVE_".uc($_);
 107         if (not defined($symbols{$_})) {
 108                 print "$ac_func_checks{$_}: Autoconf-checked function `$_' is unused\n";
 109         } elsif (not defined($symbols{$def})) {
 110                 print "$ac_func_checks{$_}: Autoconf-define `$def' for function `$_' is unused\n";
 111         }
 112 }
 113
 114 (keys %ac_headers) or warn("No headers found in configure.in file, parse error?");
 115
 116 foreach (keys %ac_headers) {
 117         my $def = "HAVE_".uc($_);
 118         $def =~ s/[\/\.]/_/g;
 119         if (not defined($headers{$_})) {
 120                 print "$ac_headers{$_}: Autoconf-checked header `$_' is unused\n";
 121         } elsif (not defined($symbols{$def})) {
 122                 print "$ac_headers{$_}: Autoconf-define `$def' for header `$_' is unused\n";
 123         }
 124 }