Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | #!./miniperl -w |
8990e307 | 2 | |
ebc74a4b GS |
3 | my $config_pm = $ARGV[0] || 'lib/Config.pm'; |
4 | my $glossary = $ARGV[1] || 'Porting/Glossary'; | |
8990e307 LW |
5 | @ARGV = "./config.sh"; |
6 | ||
a0d0e21e | 7 | # list names to put first (and hence lookup fastest) |
3c81428c | 8 | @fast = qw(archname osname osvers prefix libs libpth |
9 | dynamic_ext static_ext extensions dlsrc so | |
743c51bc | 10 | sig_name sig_num cc ccflags cppflags |
3c81428c | 11 | privlibexp archlibexp installprivlib installarchlib |
a0d0e21e | 12 | sharpbang startsh shsharp |
3c81428c | 13 | ); |
a0d0e21e | 14 | |
fec02dd3 AD |
15 | # names of things which may need to have slashes changed to double-colons |
16 | @extensions = qw(dynamic_ext static_ext extensions known_extensions); | |
17 | ||
a0d0e21e LW |
18 | |
19 | open CONFIG, ">$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 LW |
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 LW |
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 LW |
35 | ENDOFBEG |
36 | ||
16d20bd9 | 37 | |
a0d0e21e | 38 | @fast{@fast} = @fast; |
fec02dd3 | 39 | @extensions{@extensions} = @extensions; |
a0d0e21e LW |
40 | @non_v=(); |
41 | @v_fast=(); | |
42 | @v_others=(); | |
44a8e56a | 43 | $in_v = 0; |
a0d0e21e | 44 | |
85e6fe83 | 45 | while (<>) { |
a0d0e21e LW |
46 | next if m:^#!/bin/sh:; |
47 | # Catch CONFIG=true and PATCHLEVEL=n line from Configure. | |
48 | s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/; | |
44a8e56a | 49 | unless ($in_v or m/^(\w+)='(.*\n)/){ |
a0d0e21e LW |
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 LW |
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 TB |
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 LW |
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 TP |
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 LW |
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 LW |
117 | sub FIRSTKEY { |
118 | $prevpos = 0; | |
aa1bdcb8 TP |
119 | # my($key) = $config_sh =~ m/^(.*?)=/; |
120 | substr($config_sh, 0, index($config_sh, '=') ); | |
121 | # $key; | |
a0d0e21e LW |
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, $len) : undef; |
85e6fe83 | 129 | } |
a0d0e21e | 130 | |
3c81428c | 131 | sub EXISTS { |
aa1bdcb8 TP |
132 | # exists($_[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 LW |
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 W |
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 W |
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 GS |
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 LW |
336 | |
337 | close(CONFIG); | |
ebc74a4b | 338 | close(GLOS); |
a0d0e21e LW |
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; |