[Buildroot] [git commit branch/next] Config.in: improve BR2_REPRODUCIBLE help text

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=bedb16105dd6742d3209af7ef45c23a8bb1c077f
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/next

Signed-off-by: Jérôme Pouiller <jezz at sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 Config.in | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Config.in b/Config.in
index 5cf0c4d..98096df 100644
--- a/Config.in
+++ b/Config.in
@@ -707,6 +707,12 @@ config BR2_REPRODUCIBLE
 	  this allows to generate exactly identical binaries from one
 	  build to the other, including on different machines.
 
+	  The current implementation is restricted to builds with the
+	  same output directory. Many (absolute) paths are recorded in
+	  intermediary files, and it is very likely that some of these
+	  paths leak into the target rootfs. If you build with the
+	  same O=... path, however, the result is identical.
+
 	  This is labeled as an experimental feature, as not all
 	  packages behave properly to ensure reproducibility.