Commit | Line | Data |
a0d0e21e |
1 | #!./miniperl -w |
8990e307 |
2 | |
ebc74a4b |
3 | my $config_pm = $ARGV[0] || 'lib/Config.pm'; |
4 | my $glossary = $ARGV[1] || 'Porting/Glossary'; |
8990e307 |
5 | @ARGV = "./config.sh"; |
6 | |
a0d0e21e |
7 | # list names to put first (and hence lookup fastest) |
3c81428c |
8 | @fast = qw(archname osname osvers prefix libs libpth |
9 | dynamic_ext static_ext extensions dlsrc so |
743c51bc |
10 | sig_name sig_num cc ccflags cppflags |
3c81428c |
11 | privlibexp archlibexp installprivlib installarchlib |
a0d0e21e |
12 | sharpbang startsh shsharp |
3c81428c |
13 | ); |
a0d0e21e |
14 | |
fec02dd3 |
15 | # names of things which may need to have slashes changed to double-colons |
16 | @extensions = qw(dynamic_ext static_ext extensions known_extensions); |
17 | |
a0d0e21e |
18 | |
19 | open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n"; |
a5f75d66 |
20 | $myver = $]; |
3c81428c |
21 | |
a0d0e21e |
22 | print CONFIG <<"ENDOFBEG"; |
8990e307 |
23 | package Config; |
3c81428c |
24 | use Exporter (); |
8990e307 |
25 | \@ISA = (Exporter); |
26 | \@EXPORT = qw(%Config); |
3c81428c |
27 | \@EXPORT_OK = qw(myconfig config_sh config_vars); |
8990e307 |
28 | |
a5f75d66 |
29 | \$] == $myver |
9193ea20 |
30 | or die "Perl lib version ($myver) doesn't match executable version (\$])"; |
8990e307 |
31 | |
a0d0e21e |
32 | # This file was created by configpm when Perl was built. Any changes |
33 | # made to this file will be lost the next time perl is built. |
34 | |
8990e307 |
35 | ENDOFBEG |
36 | |
16d20bd9 |
37 | |
a0d0e21e |
38 | @fast{@fast} = @fast; |
fec02dd3 |
39 | @extensions{@extensions} = @extensions; |
a0d0e21e |
40 | @non_v=(); |
41 | @v_fast=(); |
42 | @v_others=(); |
44a8e56a |
43 | $in_v = 0; |
a0d0e21e |
44 | |
85e6fe83 |
45 | while (<>) { |
a0d0e21e |
46 | next if m:^#!/bin/sh:; |
47 | # Catch CONFIG=true and PATCHLEVEL=n line from Configure. |
48 | s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/; |
44a8e56a |
49 | unless ($in_v or m/^(\w+)='(.*\n)/){ |
a0d0e21e |
50 | push(@non_v, "#$_"); # not a name='value' line |
51 | next; |
52 | } |
44a8e56a |
53 | if ($in_v) { $val .= $_; } |
54 | else { ($name,$val) = ($1,$2); } |
55 | $in_v = $val !~ /'\n/; |
56 | next if $in_v; |
fec02dd3 |
57 | if ($extensions{$name}) { s,/,::,g } |
44a8e56a |
58 | if (!$fast{$name}){ push(@v_others, "$name='$val"); next; } |
59 | push(@v_fast,"$name='$val"); |
a0d0e21e |
60 | } |
61 | |
62 | foreach(@non_v){ print CONFIG $_ } |
63 | |
64 | print CONFIG "\n", |
3c81428c |
65 | "my \$config_sh = <<'!END!';\n", |
a0d0e21e |
66 | join("", @v_fast, sort @v_others), |
3c81428c |
67 | "!END!\n\n"; |
68 | |
69 | # copy config summary format from the myconfig script |
70 | |
71 | print CONFIG "my \$summary = <<'!END!';\n"; |
72 | |
73 | open(MYCONFIG,"<myconfig") || die "open myconfig failed: $!"; |
54310121 |
74 | 1 while defined($_ = <MYCONFIG>) && !/^Summary of/; |
75 | do { print CONFIG $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/; |
3c81428c |
76 | close(MYCONFIG); |
a0d0e21e |
77 | |
3c81428c |
78 | print CONFIG "\n!END!\n", <<'EOT'; |
79 | my $summary_expanded = 0; |
80 | |
81 | sub myconfig { |
82 | return $summary if $summary_expanded; |
ca8cad5c |
83 | $summary =~ s{\$(\w+)} |
84 | { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge; |
3c81428c |
85 | $summary_expanded = 1; |
86 | $summary; |
87 | } |
88 | EOT |
89 | |
90 | # ---- |
a0d0e21e |
91 | |
92 | print CONFIG <<'ENDOFEND'; |
93 | |
a0d0e21e |
94 | sub FETCH { |
aa1bdcb8 |
95 | # check for cached value (which may be undef so we use exists not defined) |
a0d0e21e |
96 | return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]}); |
aa1bdcb8 |
97 | |
98 | # Search for it in the big string |
99 | my($value, $start, $marker); |
100 | $marker = "$_[1]='"; |
101 | # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m); |
102 | $start = index($config_sh, "\n$marker"); |
103 | return undef if ( ($start == -1) && # in case it's first |
104 | (substr($config_sh, 0, length($marker)) ne $marker) ); |
105 | if ($start == -1) { $start = length($marker) } |
106 | else { $start += length($marker) + 1 } |
107 | $value = substr($config_sh, $start, |
44a8e56a |
108 | index($config_sh, qq('\n), $start) - $start); |
a0d0e21e |
109 | |
110 | $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}". |
111 | $_[0]->{$_[1]} = $value; # cache it |
112 | return $value; |
113 | } |
114 | |
3c81428c |
115 | my $prevpos = 0; |
116 | |
a0d0e21e |
117 | sub FIRSTKEY { |
118 | $prevpos = 0; |
aa1bdcb8 |
119 | # my($key) = $config_sh =~ m/^(.*?)=/; |
120 | substr($config_sh, 0, index($config_sh, '=') ); |
121 | # $key; |
a0d0e21e |
122 | } |
123 | |
124 | sub NEXTKEY { |
44a8e56a |
125 | my $pos = index($config_sh, qq('\n), $prevpos) + 2; |
3c81428c |
126 | my $len = index($config_sh, "=", $pos) - $pos; |
a0d0e21e |
127 | $prevpos = $pos; |
3c81428c |
128 | $len > 0 ? substr($config_sh, $pos, $len) : undef; |
85e6fe83 |
129 | } |
a0d0e21e |
130 | |
3c81428c |
131 | sub EXISTS { |
aa1bdcb8 |
132 | # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m; |
133 | exists($_[0]->{$_[1]}) or |
134 | index($config_sh, "\n$_[1]='") != -1 or |
135 | substr($config_sh, 0, length($_[1])+2) eq "$_[1]='"; |
a0d0e21e |
136 | } |
137 | |
3c81428c |
138 | sub STORE { die "\%Config::Config is read-only\n" } |
139 | sub DELETE { &STORE } |
140 | sub CLEAR { &STORE } |
a0d0e21e |
141 | |
3c81428c |
142 | |
143 | sub config_sh { |
144 | $config_sh |
748a9306 |
145 | } |
9193ea20 |
146 | |
147 | sub config_re { |
148 | my $re = shift; |
149 | my @matches = ($config_sh =~ /^$re=.*\n/mg); |
150 | @matches ? (print @matches) : print "$re: not found\n"; |
151 | } |
152 | |
3c81428c |
153 | sub config_vars { |
154 | foreach(@_){ |
9193ea20 |
155 | config_re($_), next if /\W/; |
3c81428c |
156 | my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN'; |
157 | $v='undef' unless defined $v; |
158 | print "$_='$v';\n"; |
159 | } |
160 | } |
161 | |
9193ea20 |
162 | ENDOFEND |
163 | |
164 | if ($^O eq 'os2') { |
165 | print CONFIG <<'ENDOFSET'; |
166 | my %preconfig; |
167 | if ($OS2::is_aout) { |
168 | my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m; |
169 | for (split ' ', $value) { |
170 | ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m; |
171 | $preconfig{$_} = $v eq 'undef' ? undef : $v; |
172 | } |
173 | } |
174 | sub TIEHASH { bless {%preconfig} } |
175 | ENDOFSET |
176 | } else { |
177 | print CONFIG <<'ENDOFSET'; |
178 | sub TIEHASH { bless {} } |
179 | ENDOFSET |
180 | } |
181 | |
182 | print CONFIG <<'ENDOFTAIL'; |
183 | |
fb73857a |
184 | # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD |
185 | sub DESTROY { } |
186 | |
9193ea20 |
187 | tie %Config, 'Config'; |
188 | |
3c81428c |
189 | 1; |
190 | __END__ |
748a9306 |
191 | |
3c81428c |
192 | =head1 NAME |
a0d0e21e |
193 | |
3c81428c |
194 | Config - access Perl configuration information |
195 | |
196 | =head1 SYNOPSIS |
197 | |
198 | use Config; |
199 | if ($Config{'cc'} =~ /gcc/) { |
200 | print "built by gcc\n"; |
201 | } |
202 | |
203 | use Config qw(myconfig config_sh config_vars); |
204 | |
205 | print myconfig(); |
206 | |
207 | print config_sh(); |
208 | |
209 | config_vars(qw(osname archname)); |
210 | |
211 | |
212 | =head1 DESCRIPTION |
213 | |
214 | The Config module contains all the information that was available to |
215 | the C<Configure> program at Perl build time (over 900 values). |
216 | |
217 | Shell variables from the F<config.sh> file (written by Configure) are |
218 | stored in the readonly-variable C<%Config>, indexed by their names. |
219 | |
220 | Values stored in config.sh as 'undef' are returned as undefined |
1fef88e7 |
221 | values. The perl C<exists> function can be used to check if a |
3c81428c |
222 | named variable exists. |
223 | |
224 | =over 4 |
225 | |
226 | =item myconfig() |
227 | |
228 | Returns a textual summary of the major perl configuration values. |
229 | See also C<-V> in L<perlrun/Switches>. |
230 | |
231 | =item config_sh() |
232 | |
233 | Returns the entire perl configuration information in the form of the |
234 | original config.sh shell variable assignment script. |
235 | |
236 | =item config_vars(@names) |
237 | |
238 | Prints to STDOUT the values of the named configuration variable. Each is |
239 | printed on a separate line in the form: |
240 | |
241 | name='value'; |
242 | |
243 | Names which are unknown are output as C<name='UNKNOWN';>. |
244 | See also C<-V:name> in L<perlrun/Switches>. |
245 | |
246 | =back |
247 | |
248 | =head1 EXAMPLE |
249 | |
250 | Here's a more sophisticated example of using %Config: |
251 | |
252 | use Config; |
743c51bc |
253 | use strict; |
254 | |
255 | my %sig_num; |
256 | my @sig_name; |
257 | unless($Config{sig_name} && $Config{sig_num}) { |
258 | die "No sigs?"; |
259 | } else { |
260 | my @names = split ' ', $Config{sig_name}; |
261 | @sig_num{@names} = split ' ', $Config{sig_num}; |
262 | foreach (@names) { |
263 | $sig_name[$sig_num{$_}] ||= $_; |
264 | } |
265 | } |
3c81428c |
266 | |
743c51bc |
267 | print "signal #17 = $sig_name[17]\n"; |
268 | if ($sig_num{ALRM}) { |
269 | print "SIGALRM is $sig_num{ALRM}\n"; |
3c81428c |
270 | } |
271 | |
272 | =head1 WARNING |
273 | |
274 | Because this information is not stored within the perl executable |
275 | itself it is possible (but unlikely) that the information does not |
276 | relate to the actual perl binary which is being used to access it. |
277 | |
278 | The Config module is installed into the architecture and version |
279 | specific library directory ($Config{installarchlib}) and it checks the |
280 | perl version number when loaded. |
281 | |
ebc74a4b |
282 | =head1 GLOSSARY |
283 | |
284 | Most C<Config> variables are determined by the C<Configure> script |
285 | on platforms supported by it (which is most UNIX platforms). Some |
286 | platforms have custom-made C<Config> variables, and may thus not have |
287 | some of the variables described below, or may have extraneous variables |
288 | specific to that particular port. See the port specific documentation |
289 | in such cases. |
290 | |
291 | =over 4 |
292 | |
293 | ENDOFTAIL |
294 | |
295 | open(GLOS, "<$glossary") or die "Can't open $glossary: $!"; |
296 | |
297 | my ($var,$unit,$indentpara); |
298 | my $text = ""; |
299 | while (<GLOS>) { |
300 | if (/^\s*(.*)\s*\(\s*(.+\.U)\s*\):\s*$/) { |
301 | print CONFIG "\n=item $var\n\n$text\n" if $var and $text; |
302 | ($var,$unit,$text) = ($1,$2,""); |
303 | } |
304 | else { |
305 | # bite off exactly one tab-width |
306 | s/^([ ]{8}|[ ]{0,7}\t)//; |
307 | |
308 | # indented stuff starts a separate paragraph |
309 | if (/^\s/) { |
310 | $text .= "\n" unless $indentpara; |
311 | $indentpara = 1; |
312 | } |
313 | else { |
314 | $text .= "\n" if $indentpara; |
315 | $indentpara = 0; |
316 | } |
317 | $text .= $_; |
318 | } |
319 | } |
320 | |
321 | print CONFIG "\n=item $var\n\n$text\n" if $var and $text; |
322 | |
323 | print CONFIG <<'ENDOFTAIL'; |
324 | |
325 | =back |
326 | |
3c81428c |
327 | =head1 NOTE |
328 | |
329 | This module contains a good example of how to use tie to implement a |
330 | cache and an example of how to make a tied variable readonly to those |
331 | outside of it. |
332 | |
333 | =cut |
a0d0e21e |
334 | |
9193ea20 |
335 | ENDOFTAIL |
a0d0e21e |
336 | |
337 | close(CONFIG); |
ebc74a4b |
338 | close(GLOS); |
a0d0e21e |
339 | |
340 | # Now do some simple tests on the Config.pm file we have created |
341 | unshift(@INC,'lib'); |
342 | require $config_pm; |
343 | import Config; |
344 | |
345 | die "$0: $config_pm not valid" |
346 | unless $Config{'CONFIG'} eq 'true'; |
347 | |
348 | die "$0: error processing $config_pm" |
349 | if defined($Config{'an impossible name'}) |
350 | or $Config{'CONFIG'} ne 'true' # test cache |
351 | ; |
352 | |
353 | die "$0: error processing $config_pm" |
354 | if eval '$Config{"cc"} = 1' |
355 | or eval 'delete $Config{"cc"}' |
356 | ; |
357 | |
358 | |
85e6fe83 |
359 | exit 0; |