From dd1aa8922a5e1505b17c46ab120f11b5979a2b66 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 24 Sep 2016 21:07:26 +0200
Subject: Add idea: Checksum of preprocessed output as change detection

---
 build2/checksum-change-detection | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 build2/checksum-change-detection

diff --git a/build2/checksum-change-detection b/build2/checksum-change-detection
new file mode 100644
index 0000000..3069800
--- /dev/null
+++ b/build2/checksum-change-detection
@@ -0,0 +1,9 @@
+- Checksum of preprocessed output as change detection [idea]
+
+If instead of a timestamp (or, really, in addition to timestamp) we hash the
+preprocessor output, then we can detect (and avoid updating on) whitespace-
+only changes (e.g., edited a comment).
+
+The big question will be how to reuse this output if we do need to recompile.
+
+Also, this may fit nicely with the build slave idea.
-- 
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