Bug#999738: Sample research tag, untested

[Felix Lechner <felix.lechner@lease-up.com>]

diff --git a/lib/Lintian/Check/Languages/Guile/DynamicLink.pm
b/lib/Lintian/Check/Languages/Guile/DynamicLink.pm
new file mode 100644
index 0000000000..dcbd250139
--- /dev/null
+++ b/lib/Lintian/Check/Languages/Guile/DynamicLink.pm
@@ -0,0 +1,68 @@
+# languages/guile/dynamic-link -- lintian check script -*- perl -*-
+
+# Copyright © 2021 Felix Lechner
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, you can find it on the World Wide
+# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
+# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+package Lintian::Check::Languages::Guile::DynamicLink;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+usa List::SomeUtils qw(uniq);
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+const my $LEFT_SQUARE_BRACKET => q{[};
+const my $RIGHT_SQUARE_BRACKET => q{]};
+
+sub visit_installed_files {
+    my ($self, $item) = @_;
+
+    return
+      unless $item->name =~ m{ [.] scm $}x
+      || $item->interpreter eq 'guile';
+
+    # slurping contents for now
+    my $contents = $item->decoded_utf8;
+    return
+      unless length $contents;
+
+    my @libraries
+      = ($contents
+          =~ m{ [(] define \s+ \S+ \s+ [(] dynamic-link \s+ "([^"]+)"
[)] [)] }gx
+      );
+
+    $self->hint('guile-dynamic-link', $_,
+        $LEFT_SQUARE_BRACKET . $item->name . $RIGHT_SQUARE_BRACKET)
+      for uniq @libraries;
+
+    return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et

diff --git a/tags/g/guile-dynamic-link.tag b/tags/g/guile-dynamic-link.tag
new file mode 100644
index 0000000000..d1faa0b92d
--- /dev/null
+++ b/tags/g/guile-dynamic-link.tag
@@ -0,0 +1,7 @@
+Tag: guile-dynamic-link
+Severity: classification
+Check: languages/guile/dynamic-link
+Explanation: Guile tries to load this shared library via a Scheme
expression like
+ <code>(define libglib (dynamic-link "libglib-2.0"))</code>.
+See-Also:
+ Bug#999738