From c3635a23429f871c9384ba83f327779f73bebcd7 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 20 Mar 2021 10:44:05 +0200
Subject: Don't create file cache entry for non-existent .ii file

---
 libbuild2/cc/compile-rule.cxx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index cb11728..a27530a 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -1256,6 +1256,9 @@ namespace build2
             //
             // @@ TMP: probably outdated. Probably the same for partitions.
             //
+            // @@ See also similar check in extract_headers(), existing entry
+            //    case.
+            //
             if (ctype == compiler_type::msvc)
             {
               if (ut == unit_type::module_intf)
@@ -4029,7 +4032,10 @@ namespace build2
               // If modules are enabled, then we keep the preprocessed output
               // around (see apply() for details).
               //
-              return modules
+              // See apply() for details on the extra MSVC check.
+              //
+              return modules && (ctype != compiler_type::msvc ||
+                                 md.type != unit_type::module_intf)
                 ? make_pair (ctx.fcache.create_existing (t.path () + x_pext),
                              true)
                 : make_pair (file_cache::entry (), false);
-- 
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