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920dae64 AT |
1 | package ExtUtils::Mkbootstrap; |
2 | ||
3 | $VERSION = 1.15; | |
4 | ||
5 | use Config; | |
6 | use Exporter; | |
7 | @ISA=('Exporter'); | |
8 | @EXPORT='&Mkbootstrap'; | |
9 | ||
10 | sub Mkbootstrap { | |
11 | my($baseext, @bsloadlibs)=@_; | |
12 | @bsloadlibs = grep($_, @bsloadlibs); # strip empty libs | |
13 | ||
14 | print STDOUT " bsloadlibs=@bsloadlibs\n" if $Verbose; | |
15 | ||
16 | # We need DynaLoader here because we and/or the *_BS file may | |
17 | # call dl_findfile(). We don't say `use' here because when | |
18 | # first building perl extensions the DynaLoader will not have | |
19 | # been built when MakeMaker gets first used. | |
20 | require DynaLoader; | |
21 | ||
22 | rename "$baseext.bs", "$baseext.bso" | |
23 | if -s "$baseext.bs"; | |
24 | ||
25 | if (-f "${baseext}_BS"){ | |
26 | $_ = "${baseext}_BS"; | |
27 | package DynaLoader; # execute code as if in DynaLoader | |
28 | local($osname, $dlsrc) = (); # avoid warnings | |
29 | ($osname, $dlsrc) = @Config::Config{qw(osname dlsrc)}; | |
30 | $bscode = ""; | |
31 | unshift @INC, "."; | |
32 | require $_; | |
33 | shift @INC; | |
34 | } | |
35 | ||
36 | if ($Config{'dlsrc'} =~ /^dl_dld/){ | |
37 | package DynaLoader; | |
38 | push(@dl_resolve_using, dl_findfile('-lc')); | |
39 | } | |
40 | ||
41 | my(@all) = (@bsloadlibs, @DynaLoader::dl_resolve_using); | |
42 | my($method) = ''; | |
43 | if (@all){ | |
44 | open BS, ">$baseext.bs" | |
45 | or die "Unable to open $baseext.bs: $!"; | |
46 | print STDOUT "Writing $baseext.bs\n"; | |
47 | print STDOUT " containing: @all" if $Verbose; | |
48 | print BS "# $baseext DynaLoader bootstrap file for $^O architecture.\n"; | |
49 | print BS "# Do not edit this file, changes will be lost.\n"; | |
50 | print BS "# This file was automatically generated by the\n"; | |
51 | print BS "# Mkbootstrap routine in ExtUtils::Mkbootstrap (v$VERSION).\n"; | |
52 | print BS "\@DynaLoader::dl_resolve_using = "; | |
53 | # If @all contains names in the form -lxxx or -Lxxx then it's asking for | |
54 | # runtime library location so we automatically add a call to dl_findfile() | |
55 | if (" @all" =~ m/ -[lLR]/){ | |
56 | print BS " dl_findfile(qw(\n @all\n ));\n"; | |
57 | }else{ | |
58 | print BS " qw(@all);\n"; | |
59 | } | |
60 | # write extra code if *_BS says so | |
61 | print BS $DynaLoader::bscode if $DynaLoader::bscode; | |
62 | print BS "\n1;\n"; | |
63 | close BS; | |
64 | } | |
65 | } | |
66 | ||
67 | 1; | |
68 | ||
69 | __END__ | |
70 | ||
71 | =head1 NAME | |
72 | ||
73 | ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader | |
74 | ||
75 | =head1 SYNOPSIS | |
76 | ||
77 | C<Mkbootstrap> | |
78 | ||
79 | =head1 DESCRIPTION | |
80 | ||
81 | Mkbootstrap typically gets called from an extension Makefile. | |
82 | ||
83 | There is no C<*.bs> file supplied with the extension. Instead, there may | |
84 | be a C<*_BS> file which has code for the special cases, like posix for | |
85 | berkeley db on the NeXT. | |
86 | ||
87 | This file will get parsed, and produce a maybe empty | |
88 | C<@DynaLoader::dl_resolve_using> array for the current architecture. | |
89 | That will be extended by $BSLOADLIBS, which was computed by | |
90 | ExtUtils::Liblist::ext(). If this array still is empty, we do nothing, | |
91 | else we write a .bs file with an C<@DynaLoader::dl_resolve_using> | |
92 | array. | |
93 | ||
94 | The C<*_BS> file can put some code into the generated C<*.bs> file by | |
95 | placing it in C<$bscode>. This is a handy 'escape' mechanism that may | |
96 | prove useful in complex situations. | |
97 | ||
98 | If @DynaLoader::dl_resolve_using contains C<-L*> or C<-l*> entries then | |
99 | Mkbootstrap will automatically add a dl_findfile() call to the | |
100 | generated C<*.bs> file. | |
101 | ||
102 | =cut |