teach expand_instantiations to deal with preprocessor defines

diff --git a/cmake/scripts/expand_instantiations.cc b/cmake/scripts/expand_instantiations.cc
index 246ff2502e1cbff99b22ebb56acf594a1bf9f391..0b91fc2e9121d1750d0320c8e34dd1c04d1cee37 100644 (file)
--- a/cmake/scripts/expand_instantiations.cc
+++ b/cmake/scripts/expand_instantiations.cc
@@ -439,7 +439,17 @@ process_instantiations()
   //   for (X:Y; A:B) { INST }
   while (whole_file.size() != 0)
     {
+      // skip space, tabs, comments:
       skip_space(whole_file);
+
+      // output preprocessor defines as is:
+      if (has_prefix(whole_file, "#"))
+      {
+        std::cout << get_substring_with_delim(whole_file, "\n") << '\n';
+        skip_space(whole_file);
+        continue;
+      }
+
       if (!has_prefix(whole_file, "for"))
         {
           std::cerr << "Invalid instantiation list: missing 'for'" << std::endl;