target_link_libraries: Add PUBLIC/PRIVATE/INTERFACE keyword signature

Add a new signature to help populate INTERFACE_LINK_LIBRARIES and
LINK_LIBRARIES cleanly in a single call.  Add policy CMP0023 to control
whether the keyword signatures can be mixed with uses of the plain
signatures on the same target.

2 files changed, 25 insertions, 0 deletions

diff --git a/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt b/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt
index 224053994f..06019e6910 100644
--- a/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt
+++ b/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt
@@ -124,3 +124,9 @@ add_library(libConsumer empty.cpp)
 target_link_libraries(libConsumer debug depA)
 
 add_subdirectory(cmp0022)
+
+add_executable(newsignature1 newsignature1.cpp)
+target_link_libraries(newsignature1 PRIVATE depC INTERFACE depD PUBLIC depB PRIVATE subdirlib INTERFACE INTERFACE PUBLIC)
+
+assert_property(newsignature1 INTERFACE_LINK_LIBRARIES "depD;depB")
+assert_property(newsignature1 LINK_LIBRARIES "depC;depB;subdirlib")
diff --git a/Tests/CMakeCommands/target_link_libraries/newsignature1.cpp b/Tests/CMakeCommands/target_link_libraries/newsignature1.cpp
new file mode 100644
index 0000000000..d1321a15fe
--- /dev/null
+++ b/Tests/CMakeCommands/target_link_libraries/newsignature1.cpp
@@ -0,0 +1,19 @@
+
+#include "depB.h"
+#include "depC.h"
+#include "depIfaceOnly.h"
+
+#include "subdirlib.h"
+
+int main(int, char **)
+{
+  DepA a;
+  DepB b;
+  DepC c;
+
+  DepIfaceOnly iface_only;
+
+  SubDirLibObject sd;
+
+  return a.foo() + b.foo() + c.foo() + iface_only.foo() + sd.foo();
+}