cmTarget: Evaluate CMP0026 and CMP0051 in calling context

These policies should be checked at the call site that tries to access
the LOCATION or SOURCES property, not the directory scope containing the
target.  Thread the caller context through cmTarget::GetProperty to use
for checking the policy setting and emitting a diagnostic with proper
backtrace.

Extend the RunCMake.CMP0026 and RunCMake.CMP0051 tests with
cross-directory cases.

1 files changed, 17 insertions, 1 deletions

diff --git a/Tests/RunCMake/CMP0051/CMP0051-WARN-stderr.txt b/Tests/RunCMake/CMP0051/CMP0051-WARN-stderr.txt
index f1b0357c9b..ae2e468482 100644
--- a/Tests/RunCMake/CMP0051/CMP0051-WARN-stderr.txt
+++ b/Tests/RunCMake/CMP0051/CMP0051-WARN-stderr.txt
@@ -12,4 +12,20 @@ Call Stack \(most recent call first\):
   CMakeLists.txt:3 \(include\)
 This warning is for project developers.  Use -Wno-dev to suppress it.
 
-Sources: "empty.cpp"$
+Sources: "empty.cpp"
+*
+CMake Warning \(dev\) at CMP0051-WARN.cmake:12 \(get_target_property\):
+  Policy CMP0051 is not set: List TARGET_OBJECTS in SOURCES target property.
+  Run "cmake --help-policy CMP0051" for policy details.  Use the cmake_policy
+  command to set the policy and suppress this warning.
+
+  Target "empty2" contains \$<TARGET_OBJECTS> generator expression in its
+  sources list.  This content was not previously part of the SOURCES property
+  when that property was read at configure time.  Code reading that property
+  needs to be adapted to ignore the generator expression using the
+  string\(GENEX_STRIP\) command.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+Sources: "../empty.cpp"$