Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | #!./miniperl -w |
8990e307 | 2 | |
75f92628 | 3 | $config_pm = $ARGV[0] || 'lib/Config.pm'; |
8990e307 LW |
4 | @ARGV = "./config.sh"; |
5 | ||
a0d0e21e | 6 | # list names to put first (and hence lookup fastest) |
3c81428c | 7 | @fast = qw(archname osname osvers prefix libs libpth |
8 | dynamic_ext static_ext extensions dlsrc so | |
9 | sig_name cc ccflags cppflags | |
10 | privlibexp archlibexp installprivlib installarchlib | |
a0d0e21e | 11 | sharpbang startsh shsharp |
3c81428c | 12 | ); |
a0d0e21e | 13 | |
fec02dd3 AD |
14 | # names of things which may need to have slashes changed to double-colons |
15 | @extensions = qw(dynamic_ext static_ext extensions known_extensions); | |
16 | ||
a0d0e21e LW |
17 | |
18 | open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n"; | |
8990e307 | 19 | $myver = sprintf("%.3f", $]); |
3c81428c | 20 | |
a0d0e21e | 21 | print CONFIG <<"ENDOFBEG"; |
8990e307 | 22 | package Config; |
3c81428c | 23 | use Exporter (); |
8990e307 LW |
24 | \@ISA = (Exporter); |
25 | \@EXPORT = qw(%Config); | |
3c81428c | 26 | \@EXPORT_OK = qw(myconfig config_sh config_vars); |
8990e307 LW |
27 | |
28 | \$] == $myver or die sprintf | |
29 | "Perl lib version ($myver) doesn't match executable version (%.3f)\\n", \$]; | |
30 | ||
a0d0e21e LW |
31 | # This file was created by configpm when Perl was built. Any changes |
32 | # made to this file will be lost the next time perl is built. | |
33 | ||
8990e307 LW |
34 | ENDOFBEG |
35 | ||
16d20bd9 | 36 | |
a0d0e21e | 37 | @fast{@fast} = @fast; |
fec02dd3 | 38 | @extensions{@extensions} = @extensions; |
a0d0e21e LW |
39 | @non_v=(); |
40 | @v_fast=(); | |
41 | @v_others=(); | |
42 | ||
85e6fe83 | 43 | while (<>) { |
a0d0e21e LW |
44 | next if m:^#!/bin/sh:; |
45 | # Catch CONFIG=true and PATCHLEVEL=n line from Configure. | |
46 | s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/; | |
47 | unless (m/^(\w+)='(.*)'\s*$/){ | |
48 | push(@non_v, "#$_"); # not a name='value' line | |
49 | next; | |
50 | } | |
fec02dd3 AD |
51 | $name = $1; |
52 | if ($extensions{$name}) { s,/,::,g } | |
53 | if (!$fast{$name}){ push(@v_others, $_); next; } | |
a0d0e21e LW |
54 | push(@v_fast,$_); |
55 | } | |
56 | ||
57 | foreach(@non_v){ print CONFIG $_ } | |
58 | ||
59 | print CONFIG "\n", | |
3c81428c | 60 | "my \$config_sh = <<'!END!';\n", |
a0d0e21e | 61 | join("", @v_fast, sort @v_others), |
3c81428c | 62 | "!END!\n\n"; |
63 | ||
64 | # copy config summary format from the myconfig script | |
65 | ||
66 | print CONFIG "my \$summary = <<'!END!';\n"; | |
67 | ||
68 | open(MYCONFIG,"<myconfig") || die "open myconfig failed: $!"; | |
69 | 1 while( ($_=<MYCONFIG>) !~ /^Summary of/); | |
70 | do { print CONFIG $_ } until ($_ = <MYCONFIG>) =~ /^\s*$/; | |
71 | close(MYCONFIG); | |
a0d0e21e | 72 | |
3c81428c | 73 | print CONFIG "\n!END!\n", <<'EOT'; |
74 | my $summary_expanded = 0; | |
75 | ||
76 | sub myconfig { | |
77 | return $summary if $summary_expanded; | |
78 | $summary =~ s/\$(\w+)/$Config{$1}/ge; | |
79 | $summary_expanded = 1; | |
80 | $summary; | |
81 | } | |
82 | EOT | |
83 | ||
84 | # ---- | |
a0d0e21e LW |
85 | |
86 | print CONFIG <<'ENDOFEND'; | |
87 | ||
88 | tie %Config, Config; | |
89 | sub TIEHASH { bless {} } | |
90 | sub FETCH { | |
91 | # check for cached value (which maybe undef so we use exists not defined) | |
92 | return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]}); | |
93 | ||
94 | my($value); # search for the item in the big $config_sh string | |
95 | return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m); | |
96 | ||
97 | $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}". | |
98 | $_[0]->{$_[1]} = $value; # cache it | |
99 | return $value; | |
100 | } | |
101 | ||
3c81428c | 102 | my $prevpos = 0; |
103 | ||
a0d0e21e LW |
104 | sub FIRSTKEY { |
105 | $prevpos = 0; | |
3c81428c | 106 | my($key) = $config_sh =~ m/^(.*?)=/; |
a0d0e21e LW |
107 | $key; |
108 | } | |
109 | ||
110 | sub NEXTKEY { | |
3c81428c | 111 | my $pos = index($config_sh, "\n", $prevpos) + 1; |
112 | my $len = index($config_sh, "=", $pos) - $pos; | |
a0d0e21e | 113 | $prevpos = $pos; |
3c81428c | 114 | $len > 0 ? substr($config_sh, $pos, $len) : undef; |
85e6fe83 | 115 | } |
a0d0e21e | 116 | |
3c81428c | 117 | sub EXISTS { |
a0d0e21e LW |
118 | exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m; |
119 | } | |
120 | ||
3c81428c | 121 | sub STORE { die "\%Config::Config is read-only\n" } |
122 | sub DELETE { &STORE } | |
123 | sub CLEAR { &STORE } | |
a0d0e21e | 124 | |
3c81428c | 125 | |
126 | sub config_sh { | |
127 | $config_sh | |
748a9306 | 128 | } |
3c81428c | 129 | sub config_vars { |
130 | foreach(@_){ | |
131 | my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN'; | |
132 | $v='undef' unless defined $v; | |
133 | print "$_='$v';\n"; | |
134 | } | |
135 | } | |
136 | ||
137 | 1; | |
138 | __END__ | |
748a9306 | 139 | |
3c81428c | 140 | =head1 NAME |
a0d0e21e | 141 | |
3c81428c | 142 | Config - access Perl configuration information |
143 | ||
144 | =head1 SYNOPSIS | |
145 | ||
146 | use Config; | |
147 | if ($Config{'cc'} =~ /gcc/) { | |
148 | print "built by gcc\n"; | |
149 | } | |
150 | ||
151 | use Config qw(myconfig config_sh config_vars); | |
152 | ||
153 | print myconfig(); | |
154 | ||
155 | print config_sh(); | |
156 | ||
157 | config_vars(qw(osname archname)); | |
158 | ||
159 | ||
160 | =head1 DESCRIPTION | |
161 | ||
162 | The Config module contains all the information that was available to | |
163 | the C<Configure> program at Perl build time (over 900 values). | |
164 | ||
165 | Shell variables from the F<config.sh> file (written by Configure) are | |
166 | stored in the readonly-variable C<%Config>, indexed by their names. | |
167 | ||
168 | Values stored in config.sh as 'undef' are returned as undefined | |
169 | values. The perl C<exists> function can be used to check is a | |
170 | named variable exists. | |
171 | ||
172 | =over 4 | |
173 | ||
174 | =item myconfig() | |
175 | ||
176 | Returns a textual summary of the major perl configuration values. | |
177 | See also C<-V> in L<perlrun/Switches>. | |
178 | ||
179 | =item config_sh() | |
180 | ||
181 | Returns the entire perl configuration information in the form of the | |
182 | original config.sh shell variable assignment script. | |
183 | ||
184 | =item config_vars(@names) | |
185 | ||
186 | Prints to STDOUT the values of the named configuration variable. Each is | |
187 | printed on a separate line in the form: | |
188 | ||
189 | name='value'; | |
190 | ||
191 | Names which are unknown are output as C<name='UNKNOWN';>. | |
192 | See also C<-V:name> in L<perlrun/Switches>. | |
193 | ||
194 | =back | |
195 | ||
196 | =head1 EXAMPLE | |
197 | ||
198 | Here's a more sophisticated example of using %Config: | |
199 | ||
200 | use Config; | |
201 | ||
202 | defined $Config{sig_name} || die "No sigs?"; | |
203 | foreach $name (split(' ', $Config{sig_name})) { | |
204 | $signo{$name} = $i; | |
205 | $signame[$i] = $name; | |
206 | $i++; | |
207 | } | |
208 | ||
209 | print "signal #17 = $signame[17]\n"; | |
210 | if ($signo{ALRM}) { | |
211 | print "SIGALRM is $signo{ALRM}\n"; | |
212 | } | |
213 | ||
214 | =head1 WARNING | |
215 | ||
216 | Because this information is not stored within the perl executable | |
217 | itself it is possible (but unlikely) that the information does not | |
218 | relate to the actual perl binary which is being used to access it. | |
219 | ||
220 | The Config module is installed into the architecture and version | |
221 | specific library directory ($Config{installarchlib}) and it checks the | |
222 | perl version number when loaded. | |
223 | ||
224 | =head1 NOTE | |
225 | ||
226 | This module contains a good example of how to use tie to implement a | |
227 | cache and an example of how to make a tied variable readonly to those | |
228 | outside of it. | |
229 | ||
230 | =cut | |
a0d0e21e | 231 | |
a0d0e21e LW |
232 | ENDOFEND |
233 | ||
234 | close(CONFIG); | |
235 | ||
236 | # Now do some simple tests on the Config.pm file we have created | |
237 | unshift(@INC,'lib'); | |
238 | require $config_pm; | |
239 | import Config; | |
240 | ||
241 | die "$0: $config_pm not valid" | |
242 | unless $Config{'CONFIG'} eq 'true'; | |
243 | ||
244 | die "$0: error processing $config_pm" | |
245 | if defined($Config{'an impossible name'}) | |
246 | or $Config{'CONFIG'} ne 'true' # test cache | |
247 | ; | |
248 | ||
249 | die "$0: error processing $config_pm" | |
250 | if eval '$Config{"cc"} = 1' | |
251 | or eval 'delete $Config{"cc"}' | |
252 | ; | |
253 | ||
254 | ||
85e6fe83 | 255 | exit 0; |