IncludeDirectories: Respect SYSTEM flag when using CONFIG genex.

Update the Makefile and Ninja generators to use the config when
requesting the include flags.

3 files changed, 23 insertions, 1 deletions

diff --git a/Tests/IncludeDirectories/SystemIncludeDirectories/CMakeLists.txt b/Tests/IncludeDirectories/SystemIncludeDirectories/CMakeLists.txt
index abe9f74..0215e93 100644
--- a/Tests/IncludeDirectories/SystemIncludeDirectories/CMakeLists.txt
+++ b/Tests/IncludeDirectories/SystemIncludeDirectories/CMakeLists.txt
@@ -14,8 +14,14 @@ target_include_directories(upstream SYSTEM PUBLIC
   $<TARGET_PROPERTY:systemlib,INTERFACE_INCLUDE_DIRECTORIES>
 )
 
+add_library(config_specific INTERFACE)
+set(testConfig ${CMAKE_BUILD_TYPE})
+target_include_directories(config_specific SYSTEM INTERFACE
+  "$<$<CONFIG:${testConfig}>:${CMAKE_CURRENT_SOURCE_DIR}/config_specific>"
+)
+
 add_library(consumer consumer.cpp)
-target_link_libraries(consumer upstream)
+target_link_libraries(consumer upstream config_specific)
 target_compile_options(consumer PRIVATE -Werror=unused-variable)
 
 add_library(iface IMPORTED INTERFACE)
diff --git a/Tests/IncludeDirectories/SystemIncludeDirectories/config_specific/config_iface.h b/Tests/IncludeDirectories/SystemIncludeDirectories/config_specific/config_iface.h
new file mode 100644
index 0000000..05d3604
--- /dev/null
+++ b/Tests/IncludeDirectories/SystemIncludeDirectories/config_specific/config_iface.h
@@ -0,0 +1,14 @@
+
+#ifndef CONFIG_IFACE_H
+#define CONFIG_IFACE_H
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+int configUnusedFunc()
+{
+  int unused;
+  return 0;
+}
+
+#endif
diff --git a/Tests/IncludeDirectories/SystemIncludeDirectories/consumer.cpp b/Tests/IncludeDirectories/SystemIncludeDirectories/consumer.cpp
index 197dae8..be18ebf 100644
--- a/Tests/IncludeDirectories/SystemIncludeDirectories/consumer.cpp
+++ b/Tests/IncludeDirectories/SystemIncludeDirectories/consumer.cpp
@@ -1,6 +1,8 @@
 
 #include "upstream.h"
 
+#include "config_iface.h"
+
 int consumer()
 {
   return upstream();