From ccf71c91ec5b6fad26a15ec0dd1ec31f57069934 Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Tue, 7 Jul 2020 08:12:09 -0400
Subject: [PATCH] teach expand_instantiations to deal with preprocessor defines

---
 cmake/scripts/expand_instantiations.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/cmake/scripts/expand_instantiations.cc b/cmake/scripts/expand_instantiations.cc
index 246ff2502e..0b91fc2e91 100644
--- 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;
-- 
2.39.5