Added test file and test for #186

t/300-doc-comments.t

@@ -27,6 +27,7 @@ use autodie;    # note: still need to check system() calls manually
 use FindBin '$Bin';
 use lib $Bin;
 
+use File::Spec;
 use Test::More;
 
 use TestEnvironment;
@@ -163,4 +164,10 @@ run_produces_ok('ident query (existent, prototype, documented in C file), #134',
     ],
     MUST_SUCCEED);
 
+# #186
+run_produces_ok('No warnings on macro, #186',
+    [$tenv->find_doc, File::Spec->catfile($tenv->lxr_repo_dir, 'issue186.c')],
+    [ ],
+    MUST_SUCCEED);  # warnings appear on stderr, failing the MUST_SUCCEED checks
+
 done_testing;

t/tree/issue186.c

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: CC0-1.0
+// This file triggers the bug described in #186.
+
+#ifdef SOMETHING
+static int undocumented_function(struct platform_device *pdev)
+{
+}
+
+#else
+#define undocumented_function	NULL
+#endif