X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=configpm;h=9bfeab5070e492a24491022abe9cff0a1a94c24f;hb=3c81428c5fa001df0f0ac7d48bfc483afd5efff5;hp=95fa9491afc66da0e26a71b6a4e01244377f83d9;hpb=85e6fe838fb25b257a1b363debf8691c0992ef71;p=p5sagit%2Fp5-mst-13.2.git diff --git a/configpm b/configpm index 95fa949..9bfeab5 100755 --- a/configpm +++ b/configpm @@ -1,28 +1,255 @@ -#!./miniperl +#!./miniperl -w +$config_pm = $ARGV[0] || 'lib/Config.pm'; @ARGV = "./config.sh"; -open STDOUT, ">lib/Config.pm" - or die "Can't open lib/Config.pm: $!\n"; +# list names to put first (and hence lookup fastest) +@fast = qw(archname osname osvers prefix libs libpth + dynamic_ext static_ext extensions dlsrc so + sig_name cc ccflags cppflags + privlibexp archlibexp installprivlib installarchlib + sharpbang startsh shsharp +); + +# names of things which may need to have slashes changed to double-colons +@extensions = qw(dynamic_ext static_ext extensions known_extensions); + + +open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n"; $myver = sprintf("%.3f", $]); -print <<"ENDOFBEG"; + +print CONFIG <<"ENDOFBEG"; package Config; -require Exporter; +use Exporter (); \@ISA = (Exporter); \@EXPORT = qw(%Config); +\@EXPORT_OK = qw(myconfig config_sh config_vars); \$] == $myver or die sprintf "Perl lib version ($myver) doesn't match executable version (%.3f)\\n", \$]; +# This file was created by configpm when Perl was built. Any changes +# made to this file will be lost the next time perl is built. + ENDOFBEG + +@fast{@fast} = @fast; +@extensions{@extensions} = @extensions; +@non_v=(); +@v_fast=(); +@v_others=(); + while (<>) { - s:^#!/bin/sh::; - s/'undef'/undef/; # So we can say "if $Config{'foo'}". - s/=true$/='true'/; # Catch CONFIG=true line from Configure. - s/^(\w+)=/\$Config{'$1'} = /; - s/$/;/ unless (/^#/ || /^$/); - print $_; -} -print "1;\n"; + next if m:^#!/bin/sh:; + # Catch CONFIG=true and PATCHLEVEL=n line from Configure. + s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/; + unless (m/^(\w+)='(.*)'\s*$/){ + push(@non_v, "#$_"); # not a name='value' line + next; + } + $name = $1; + if ($extensions{$name}) { s,/,::,g } + if (!$fast{$name}){ push(@v_others, $_); next; } + push(@v_fast,$_); +} + +foreach(@non_v){ print CONFIG $_ } + +print CONFIG "\n", + "my \$config_sh = <<'!END!';\n", + join("", @v_fast, sort @v_others), + "!END!\n\n"; + +# copy config summary format from the myconfig script + +print CONFIG "my \$summary = <<'!END!';\n"; + +open(MYCONFIG,") !~ /^Summary of/); +do { print CONFIG $_ } until ($_ = ) =~ /^\s*$/; +close(MYCONFIG); + +print CONFIG "\n!END!\n", <<'EOT'; +my $summary_expanded = 0; + +sub myconfig { + return $summary if $summary_expanded; + $summary =~ s/\$(\w+)/$Config{$1}/ge; + $summary_expanded = 1; + $summary; +} +EOT + +# ---- + +print CONFIG <<'ENDOFEND'; + +tie %Config, Config; +sub TIEHASH { bless {} } +sub FETCH { + # check for cached value (which maybe undef so we use exists not defined) + return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]}); + + my($value); # search for the item in the big $config_sh string + return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m); + + $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}". + $_[0]->{$_[1]} = $value; # cache it + return $value; +} + +my $prevpos = 0; + +sub FIRSTKEY { + $prevpos = 0; + my($key) = $config_sh =~ m/^(.*?)=/; + $key; +} + +sub NEXTKEY { + my $pos = index($config_sh, "\n", $prevpos) + 1; + my $len = index($config_sh, "=", $pos) - $pos; + $prevpos = $pos; + $len > 0 ? substr($config_sh, $pos, $len) : undef; +} + +sub EXISTS { + exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m; +} + +sub STORE { die "\%Config::Config is read-only\n" } +sub DELETE { &STORE } +sub CLEAR { &STORE } + + +sub config_sh { + $config_sh +} +sub config_vars { + foreach(@_){ + my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN'; + $v='undef' unless defined $v; + print "$_='$v';\n"; + } +} + +1; +__END__ + +=head1 NAME + +Config - access Perl configuration information + +=head1 SYNOPSIS + + use Config; + if ($Config{'cc'} =~ /gcc/) { + print "built by gcc\n"; + } + + use Config qw(myconfig config_sh config_vars); + + print myconfig(); + + print config_sh(); + + config_vars(qw(osname archname)); + + +=head1 DESCRIPTION + +The Config module contains all the information that was available to +the C program at Perl build time (over 900 values). + +Shell variables from the F file (written by Configure) are +stored in the readonly-variable C<%Config>, indexed by their names. + +Values stored in config.sh as 'undef' are returned as undefined +values. The perl C function can be used to check is a +named variable exists. + +=over 4 + +=item myconfig() + +Returns a textual summary of the major perl configuration values. +See also C<-V> in L. + +=item config_sh() + +Returns the entire perl configuration information in the form of the +original config.sh shell variable assignment script. + +=item config_vars(@names) + +Prints to STDOUT the values of the named configuration variable. Each is +printed on a separate line in the form: + + name='value'; + +Names which are unknown are output as C. +See also C<-V:name> in L. + +=back + +=head1 EXAMPLE + +Here's a more sophisticated example of using %Config: + + use Config; + + defined $Config{sig_name} || die "No sigs?"; + foreach $name (split(' ', $Config{sig_name})) { + $signo{$name} = $i; + $signame[$i] = $name; + $i++; + } + + print "signal #17 = $signame[17]\n"; + if ($signo{ALRM}) { + print "SIGALRM is $signo{ALRM}\n"; + } + +=head1 WARNING + +Because this information is not stored within the perl executable +itself it is possible (but unlikely) that the information does not +relate to the actual perl binary which is being used to access it. + +The Config module is installed into the architecture and version +specific library directory ($Config{installarchlib}) and it checks the +perl version number when loaded. + +=head1 NOTE + +This module contains a good example of how to use tie to implement a +cache and an example of how to make a tied variable readonly to those +outside of it. + +=cut + +ENDOFEND + +close(CONFIG); + +# Now do some simple tests on the Config.pm file we have created +unshift(@INC,'lib'); +require $config_pm; +import Config; + +die "$0: $config_pm not valid" + unless $Config{'CONFIG'} eq 'true'; + +die "$0: error processing $config_pm" + if defined($Config{'an impossible name'}) + or $Config{'CONFIG'} ne 'true' # test cache + ; + +die "$0: error processing $config_pm" + if eval '$Config{"cc"} = 1' + or eval 'delete $Config{"cc"}' + ; + + exit 0;