Handle genexes when evaluating INTERFACE_INCLUDE_DIRECTORIES errors.

2 files changed, 26 insertions, 0 deletions

diff --git a/Help/manual/cmake-policies.7.rst b/Help/manual/cmake-policies.7.rst
index cd91c91..658620f 100644
--- a/Help/manual/cmake-policies.7.rst
+++ b/Help/manual/cmake-policies.7.rst
@@ -36,3 +36,4 @@ All Policies
    /policy/CMP0024
    /policy/CMP0025
    /policy/CMP0026
+   /policy/CMP0027
diff --git a/Help/policy/CMP0027.rst b/Help/policy/CMP0027.rst
new file mode 100644
index 0000000..352f7b8
--- /dev/null
+++ b/Help/policy/CMP0027.rst
@@ -0,0 +1,25 @@
+CMP0027
+-------
+
+Conditionally linked imported targets with missing include directories.
+
+CMake 2.8.11 introduced introduced the concept of
+INTERFACE_INCLUDE_DIRECTORIES, and a check at cmake time that the
+entries in the INTERFACE_INCLUDE_DIRECTORIES of an IMPORTED target
+actually exist.  CMake 2.8.11 also introduced generator expression
+support in the target_link_libraries command.  However, if an imported
+target is linked as a result of a generator expression evaluation, the
+entries in the INTERFACE_INCLUDE_DIRECTORIES of that target were not
+checked for existence as they should be.
+
+The OLD behavior of this policy is to report a warning if an entry in
+the INTERFACE_INCLUDE_DIRECTORIES of a generator-expression
+conditionally linked IMPORTED target does not exist.
+
+The NEW behavior of this policy is to report an error if an entry in
+the INTERFACE_INCLUDE_DIRECTORIES of a generator-expression
+conditionally linked IMPORTED target does not exist.
+
+This policy was introduced in CMake version 3.0.0.  CMake version
+|release| warns when the policy is not set and uses OLD behavior.  Use
+the cmake_policy command to set it to OLD or NEW explicitly.