Add deprecation warnings for policies CMP0075 and below

The OLD behaviors of all policies are deprecated, but only by
documentation.  Add an explicit deprecation diagnostic for policies
introduced in CMake 3.12 and below to encourage projects to port
away from setting policies to OLD.

2 files changed, 22 insertions, 1 deletions

diff --git a/Tests/RunCMake/CheckModules/CMP0075-stderr.txt b/Tests/RunCMake/CheckModules/CMP0075-stderr.txt
index 960fe94..97833f5 100644
--- a/Tests/RunCMake/CheckModules/CMP0075-stderr.txt
+++ b/Tests/RunCMake/CheckModules/CMP0075-stderr.txt
@@ -47,4 +47,15 @@ CMake Warning \(dev\) at [^
 Call Stack \(most recent call first\):
   CMP0075.cmake:41 \(check_include_files\)
   CMakeLists.txt:[0-9]+ \(include\)
-This warning is for project developers.  Use -Wno-dev to suppress it.$
+This warning is for project developers.  Use -Wno-dev to suppress it.
++
+CMake Deprecation Warning at CMP0075.cmake:[0-9]+ \(cmake_policy\):
+  The OLD behavior for policy CMP0075 will be removed from a future version
+  of CMake.
+
+  The cmake-policies\(7\) manual explains that the OLD behaviors of all
+  policies are deprecated and that a policy should be set to OLD only under
+  specific short-term circumstances.  Projects should be ported to the NEW
+  behavior and not rely on setting a policy to OLD.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:[0-9]+ \(include\)$
diff --git a/Tests/RunCMake/add_library/CMP0073-stderr.txt b/Tests/RunCMake/add_library/CMP0073-stderr.txt
new file mode 100644
index 0000000..7f43fd7
--- /dev/null
+++ b/Tests/RunCMake/add_library/CMP0073-stderr.txt
@@ -0,0 +1,10 @@
+^CMake Deprecation Warning at CMP0073.cmake:[0-9]+ \(cmake_policy\):
+  The OLD behavior for policy CMP0073 will be removed from a future version
+  of CMake.
+
+  The cmake-policies\(7\) manual explains that the OLD behaviors of all
+  policies are deprecated and that a policy should be set to OLD only under
+  specific short-term circumstances.  Projects should be ported to the NEW
+  behavior and not rely on setting a policy to OLD.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:[0-9]+ \(include\)$