From: Casey Bodley <cbodley@redhat.com>
Date: Thu, 31 Mar 2022 18:35:45 +0000 (-0400)
Subject: README: document cmake options for system packages
X-Git-Tag: v18.0.0~1122^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F45740%2Fhead;p=ceph.git

README: document cmake options for system packages

Signed-off-by: Casey Bodley <cbodley@redhat.com>
---

diff --git a/README.md b/README.md
index c4c691850092..96f2c6aff28d 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,14 @@ for a couple of external dependencies:
 	-DCMAKE_INSTALL_PREFIX=/opt/ceph -DCMAKE_C_FLAGS="-Og -g3 -gdwarf-4" \
 	..
 
+Ceph has several bundled dependencies such as Boost, RocksDB and Arrow. By
+default, cmake will build these bundled dependencies from source instead of
+using libraries that are already installed on the system. You can opt-in to
+using these system libraries, provided they meet the minimum version required
+by Ceph, with cmake options like `WITH_SYSTEM_BOOST`:
+
+	cmake -DWITH_SYSTEM_BOOST=ON [...]
+
 To view an exhaustive list of -D options, you can invoke `cmake` with:
 
 	cmake -LH