From a404382a60b74f0df46dc102ee309913214fd8e6 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 28 Aug 2024 12:05:57 +0200
Subject: Don't assume preprocessed TU exists if reprocessing (GH issue #409)

---
 libbuild2/cc/compile-rule.cxx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libbuild2/cc/compile-rule.cxx b/libbuild2/cc/compile-rule.cxx
index faba121..cebd244 100644
--- a/libbuild2/cc/compile-rule.cxx
+++ b/libbuild2/cc/compile-rule.cxx
@@ -4167,9 +4167,10 @@ namespace build2
             if (l->empty ()) // Done, nothing changed.
             {
               // If modules are enabled, then we keep the preprocessed output
-              // around (see apply() for details).
+              // around (see apply() for details). Unless reprocessing was
+              // requested.
               //
-              if (modules)
+              if (modules && !reprocess)
               {
                 result.first = ctx.fcache->create_existing (t.path () + pext);
                 result.second = true;
-- 
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