Merge pull request #70 from traversaro/vcpkgvisitstruct

Support finding visit_struct in the system also if it is installed without any CMake config file

CMakeLists.txt

@@ -101,7 +101,7 @@ endif()
 # Fetching visit_struct
 include(CMakeDependentOption)
 find_package(visit_struct QUIET)
-cmake_dependent_option(USE_SYSTEM_visit_struct "Use system visit_struct" ON "visit_struct_FOUND" OFF)
+option(USE_SYSTEM_visit_struct "Use system visit_struct" ${visit_struct_FOUND})
 if(USE_SYSTEM_visit_struct)
      find_package(visit_struct REQUIRED)
 else()
@@ -219,6 +219,9 @@ install(TARGETS    matioCpp
 install(FILES "cmake/FindMATIO.cmake" DESTINATION "${CMAKE_INSTALL_PREFIX}/share/matioCpp/cmake")
 file(COPY "cmake/FindMATIO.cmake" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}/share/matioCpp/cmake")
 
+install(FILES "cmake/Findvisit_struct.cmake" DESTINATION "${CMAKE_INSTALL_PREFIX}/share/matioCpp/cmake")
+file(COPY "cmake/Findvisit_struct.cmake" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}/share/matioCpp/cmake")
+
 include(InstallBasicPackageFiles)
 
 install_basic_package_files(${PROJECT_NAME}

cmake/Findvisit_struct.cmake

@@ -0,0 +1,33 @@
+
+# - Try to find visit_struct
+#
+# The following are set after configuration is done:
+#  visit_struct_FOUND
+#
+# The following imported targets are created:
+#
+# visit_struct::visit_struct
+#
+
+include(FindPackageHandleStandardArgs)
+
+find_package(visit_struct CONFIG QUIET)
+
+if(NOT visit_struct_FOUND)
+  find_path(VISIT_STRUCT_INCLUDE_DIR visit_struct/visit_struct_intrusive.hpp)
+  mark_as_advanced(VISIT_STRUCT_INCLUDE_DIR)
+
+  if(VISIT_STRUCT_INCLUDE_DIR)
+    set(visit_struct_FOUND TRUE)
+  endif()
+endif()
+
+find_package_handle_standard_args(visit_struct DEFAULT_MSG visit_struct_FOUND)
+
+if(visit_struct_FOUND)
+    if(NOT TARGET visit_struct::visit_struct)
+      add_library(visit_struct::visit_struct INTERFACE IMPORTED)
+      set_target_properties(visit_struct::visit_struct PROPERTIES
+        INTERFACE_INCLUDE_DIRECTORIES "${VISIT_STRUCT_INCLUDE_DIR}")
+    endif()
+endif()