Fix OLD behavior of CMP0021.

Exclude Ninja and Xcode from the CMP0021 test

They do not behave the same as the makefile generator with
relative paths.

Don't overwrite the header file for in-source builds.

4 files changed, 31 insertions, 0 deletions

diff --git a/Tests/IncludeDirectories/CMP0021/CMakeLists.txt b/Tests/IncludeDirectories/CMP0021/CMakeLists.txt
new file mode 100644
index 0000000..0b9aee8
--- /dev/null
+++ b/Tests/IncludeDirectories/CMP0021/CMakeLists.txt
@@ -0,0 +1,14 @@
+
+cmake_policy(SET CMP0021 OLD)
+add_executable(cmp0021exe main.cpp)
+
+if(NOT CMAKE_CURRENT_BINARY_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+  file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/includes")
+  execute_process(COMMAND ${CMAKE_COMMAND} -E
+    copy_directory
+    "${CMAKE_CURRENT_SOURCE_DIR}/includes"
+    "${CMAKE_CURRENT_BINARY_DIR}/includes"
+  )
+endif()
+set_property(TARGET cmp0021exe PROPERTY
+  INCLUDE_DIRECTORIES includes/cmp0021)
diff --git a/Tests/IncludeDirectories/CMP0021/includes/cmp0021/cmp0021.h b/Tests/IncludeDirectories/CMP0021/includes/cmp0021/cmp0021.h
new file mode 100644
index 0000000..3d49b31
--- /dev/null
+++ b/Tests/IncludeDirectories/CMP0021/includes/cmp0021/cmp0021.h
@@ -0,0 +1,2 @@
+
+#define CMP0021_DEFINE
diff --git a/Tests/IncludeDirectories/CMP0021/main.cpp b/Tests/IncludeDirectories/CMP0021/main.cpp
new file mode 100644
index 0000000..f886c46
--- /dev/null
+++ b/Tests/IncludeDirectories/CMP0021/main.cpp
@@ -0,0 +1,11 @@
+
+#include "cmp0021.h"
+
+#ifndef CMP0021_DEFINE
+#error Expected CMP0021_DEFINE
+#endif
+
+int main(int, char **)
+{
+  return 0;
+}
diff --git a/Tests/IncludeDirectories/CMakeLists.txt b/Tests/IncludeDirectories/CMakeLists.txt
index 596a280..35ad8dc 100644
--- a/Tests/IncludeDirectories/CMakeLists.txt
+++ b/Tests/IncludeDirectories/CMakeLists.txt
@@ -86,3 +86,7 @@ get_target_property(incs empty_entry_test INCLUDE_DIRECTORIES)
 if (NOT incs STREQUAL ";/one/two")
   message(SEND_ERROR "Empty include_directories entry was not ignored.")
 endif()
+
+if(NOT CMAKE_GENERATOR STREQUAL Xcode AND NOT CMAKE_GENERATOR STREQUAL Ninja)
+  add_subdirectory(CMP0021)
+endif()