target_link_libraries: self-link through ALIAS is an error

Fixes: #19617

1 files changed, 19 insertions, 0 deletions

diff --git a/Help/policy/CMP0108.rst b/Help/policy/CMP0108.rst
new file mode 100644
index 0000000..0d54cfa
--- /dev/null
+++ b/Help/policy/CMP0108.rst
@@ -0,0 +1,19 @@
+CMP0108
+-------
+
+A target is not allowed to link to itself even through an ``ALIAS`` target.
+
+In CMake 3.17 and below, a target can link to a target aliased to itself.
+
+The ``OLD`` behavior for this policy is to allow a target to link to a target
+aliased to itself.
+
+The ``NEW`` behavior of this policy is to prevent a target to link to itself
+through an ``ALIAS`` target.
+
+This policy was introduced in CMake version 3.17.  Use the
+:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
+Unlike many policies, CMake version |release| does *not* warn
+when this policy is not set and simply uses ``OLD`` behavior.
+
+.. include:: DEPRECATED.txt