build.info: Introduce special syntax for dependencies on script modules

The DEPEND statement, when applied on files generated with GENERATE, may
be used to specify script modules that the template to be generated from
depends on.  In short, this sort of depend:

    DEPEND[generated]=util/perl/OpenSSL/something.pm

... would generate a perl run that has the inclusion directory
'util/perl/OpenSSL' and 'something' as the module to be loaded.  However,
the package name for this module is 'OpenSSL::something', so to load it the
way it's expected, the inclusion directory should be 'util/perl', and the
module to be loaded should be specified as 'OpenSSL/something' (to be
massaged into a proper module name by the build file template).

To allow this, we introduce a file syntax, where a single '|' is used as a
directory separator, to delineate what part should be used as the inclustion
directory, and which part the module name to be loaded should be derived
from:

    DEPEND[generated]=util/perl|OpenSSL/something.pm

Fixes #21112

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21117)

1 files changed, 39 insertions, 7 deletions

diff --git a/Configurations/descrip.mms.tmpl b/Configurations/descrip.mms.tmpl
index ce74b3703f..b6e6eb4d60 100644
--- a/Configurations/descrip.mms.tmpl
+++ b/Configurations/descrip.mms.tmpl
@@ -1056,16 +1056,48 @@ EOF
           my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
                                                "util", "dofile.pl")),
                                rel2abs($config{builddir}));
-          my @perlmodules = ( 'configdata.pm',
-                              grep { $_ =~ m|\.pm$| } @{$args{deps}} );
-          my %perlmoduleincs = map { '"-I'.dirname($_).'"' => 1 } @perlmodules;
+          my @perlmodules = ();
+          my %perlmoduleincs = ();
+          my %perlmoduledeps = ();
+          foreach my $x (('configdata.pm', @{$args{deps}})) {
+              # Compute (i)nclusion directory, (m)odule name and (d)ependency
+              my $i, $m, $d;
+              if ($x =~ /\|/) {
+                  $i = $`;
+                  $d = $';
+
+                  # Massage the module part to become a real perl module spec
+                  $m = $d;
+                  $m =~ s|\.pm$||;
+                  # Directory specs are :: in perl package names
+                  $m =~ s|/|::|g;
+
+                  # Full file name of the dependency
+                  $d = catfile($i, $d) if $i;
+              } elsif ($x =~ /\.pm$/) {
+                  $i = dirname($x);
+                  $m = basename($x, '.pm');
+                  $d = $x;
+              } else {
+                  # All other dependencies are simply collected
+                  $d = $x;
+              }
+              push @perlmodules, '"-M'.$m.'"' if $m;
+              $perlmoduledeps{$d} = 1;
+              $perlmoduleincs{'"-I'.$i.'"'} = 1 if $i;
+          }
+
           my @decc_include_data
               = make_decc_include_files(dirname($args{src}), dirname($gen0));
           my $decc_include_scripture = pop @decc_include_data;
-          $deps = join(' ', $deps, @decc_include_data,
-                            compute_platform_depends(@perlmodules));
-          @perlmodules = map { '"-M'.basename($_, '.pm').'"' } @perlmodules;
-          my $perlmodules = join(' ', '', sort keys %perlmoduleincs, @perlmodules);
+          # Because of the special treatment of dependencies, we need to
+          # recompute $deps completely
+          my $deps
+              = join(" ", @decc_include_data,
+                          compute_platform_depends(@{$args{generator_deps}},
+                                                   sort keys %perlmoduledeps));
+          my $perlmodules = join(' ', '', ( sort keys %perlmoduleincs ), @perlmodules);
+
 
           return <<"EOF";
 $args{src} : $gen0 $deps