From 5e392c9141ffa4e864319fc5268ce96388085699 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 9 Apr 2021 09:50:50 +0200
Subject: Document hermetic build configuration support

---
 libbuild2/parser.cxx | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'libbuild2/parser.cxx')

diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index 9022d5b..3b20a65 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -2139,6 +2139,10 @@ namespace build2
   {
     // run <name> [<arg>...]
     //
+    // Note that if the result of executing the program can be affected by
+    // environment variables and this result can in turn affect the build
+    // result, then such variables should be reported with the
+    // config.environment directive.
 
     // Parse the command line as names in the value mode to get variable
     // expansion, etc.
-- 
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