Add includes and compile definitions with target_link_libraries.

This establishes that linking is used to propagate usage-requirements
between targets in CMake code. The use of the target_link_libraries
command as the API for this is chosen because introducing a new command
would introduce confusion due to multiple commands which differ only in
a subtle way.

4 files changed, 51 insertions, 4 deletions

diff --git a/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt b/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt
index 1d0e342..cd0fe11 100644
--- a/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt
+++ b/Tests/CMakeCommands/target_link_libraries/CMakeLists.txt
@@ -62,10 +62,6 @@ assert_property(targetA LINK_INTERFACE_LIBRARIES "")
 
 add_subdirectory(subdir)
 target_link_libraries(targetA subdirlib)
-set_property(TARGET targetA APPEND PROPERTY
-  INCLUDE_DIRECTORIES
-    $<TARGET_PROPERTY:subdirlib,INTERFACE_INCLUDE_DIRECTORIES>
-)
 
 target_link_libraries(targetA depB depC)
 
@@ -87,3 +83,24 @@ set_property(TARGET depD APPEND PROPERTY
 
 add_executable(targetB targetB.cpp)
 target_link_libraries(targetB depD)
+
+macro(create_header _name)
+  file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/${_name}")
+  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/${_name}/${_name}.h" "//${_name}.h\n")
+endmacro()
+
+create_header(foo)
+create_header(bar)
+
+add_library(depG SHARED depG.cpp)
+generate_export_header(depG)
+target_include_directories(depG INTERFACE
+    "${CMAKE_CURRENT_BINARY_DIR}/foo"
+    "${CMAKE_CURRENT_BINARY_DIR}/bar"
+)
+target_compile_definitions(depG INTERFACE
+    TEST_DEF
+)
+
+add_executable(targetC targetC.cpp)
+target_link_libraries(targetC depG)
diff --git a/Tests/CMakeCommands/target_link_libraries/depG.cpp b/Tests/CMakeCommands/target_link_libraries/depG.cpp
new file mode 100644
index 0000000..65b9655
--- /dev/null
+++ b/Tests/CMakeCommands/target_link_libraries/depG.cpp
@@ -0,0 +1,7 @@
+
+#include "depG.h"
+
+int DepG::foo()
+{
+  return 0;
+}
diff --git a/Tests/CMakeCommands/target_link_libraries/depG.h b/Tests/CMakeCommands/target_link_libraries/depG.h
new file mode 100644
index 0000000..1a36589
--- /dev/null
+++ b/Tests/CMakeCommands/target_link_libraries/depG.h
@@ -0,0 +1,7 @@
+
+#include "depg_export.h"
+
+struct DEPG_EXPORT DepG
+{
+  int foo();
+};
diff --git a/Tests/CMakeCommands/target_link_libraries/targetC.cpp b/Tests/CMakeCommands/target_link_libraries/targetC.cpp
new file mode 100644
index 0000000..ff6ba66
--- /dev/null
+++ b/Tests/CMakeCommands/target_link_libraries/targetC.cpp
@@ -0,0 +1,16 @@
+
+#include "depG.h"
+
+#include "foo.h"
+#include "bar.h"
+
+#ifndef TEST_DEF
+#error Expected TEST_DEF definition
+#endif
+
+int main(int argc, char **argv)
+{
+  DepG g;
+
+  return g.foo();
+}