Use include target everywhere to get include location

CMakeLists.txt

@@ -83,6 +83,7 @@ fortuno_setup_build_type("RelWithDebInfo")
 #                                 Main definition                                                 #
 ]=================================================================================================]
 
+add_subdirectory(include)
 add_subdirectory(src)
 if (FORTUNO_BUILD_EXAMPLES)
   add_subdirectory(example)
@@ -143,22 +144,6 @@ if (FORTUNO_INSTALL)
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Fortuno
     COMPONENT Fortuno_development
   )
-  install(
-    FILES ${CMAKE_CURRENT_SOURCE_DIR}/include/fortuno.fypp
-    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
-    COMPONENT Fortuno_development
-  )
-  # introduce fake target with information about the folder containing the include file
-  add_library(fortuno_include_dir INTERFACE)
-  target_include_directories(
-    fortuno_include_dir INTERFACE
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
-  )
-  install(
-    TARGETS fortuno_include_dir
-    EXPORT FortunoTargets
-  )
 
 endif ()
 

example/fypp/CMakeLists.txt

@@ -26,8 +26,10 @@ set(
   parametrized_fypp_tests.fypp
   simple_fypp_tests.fypp
 )
+
+get_target_property(_fortuno_incdir Fortuno::fortuno_include_dir INTERFACE_INCLUDE_DIRECTORIES)
 fortuno_preprocess(
-  ${FYPP} "-I${CMAKE_SOURCE_DIR}/include;--file-var-root=${CMAKE_SOURCE_DIR}"
+  ${FYPP} "-I${_fortuno_incdir};--file-var-root=${CMAKE_SOURCE_DIR}"
   .fypp .f90
   "${fypp-sources}" fypp-f90-sources
 )

include/CMakeLists.txt

@@ -0,0 +1,25 @@
+# This file is part of Fortuno.
+# Licensed under the BSD-2-Clause Plus Patent license.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+
+# Introduce a fake target associated with the location of the folder containing the include file.
+# Query the INTERFACE_INCLUDE_DIRECTORIES of the target to obtain the include folder location.
+add_library(fortuno_include_dir INTERFACE)
+target_include_directories(
+  fortuno_include_dir INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+add_library(Fortuno::fortuno_include_dir ALIAS fortuno_include_dir)
+
+if (FORTUNO_INSTALL)
+  install(
+    FILES fortuno.fypp
+    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+    COMPONENT Fortuno_development
+  )
+  install(
+    TARGETS fortuno_include_dir
+    EXPORT FortunoTargets
+  )
+endif ()