FindImageMagick: Fix detection of version 7 from headers

Modules/FindImageMagick.cmake

@@ -298,23 +298,29 @@ function(_ImageMagick_GetVersion)
     )
 
     foreach(dir IN LISTS ImageMagick_INCLUDE_DIRS)
-      if(EXISTS ${dir}/magick/version.h)
-        file(STRINGS "${dir}/magick/version.h" results REGEX "${regex}")
-
-        foreach(line ${results})
-          if(line MATCHES "${regex}")
-            if(DEFINED version)
-              string(APPEND version "${CMAKE_MATCH_2}")
-            else()
-              set(version "${CMAKE_MATCH_2}")
+      foreach(subdir IN ITEMS MagickCore magick)
+        if(EXISTS ${dir}/${subdir}/version.h)
+          file(STRINGS "${dir}/${subdir}/version.h" results REGEX "${regex}")
+
+          foreach(line ${results})
+            if(line MATCHES "${regex}")
+              if(DEFINED version)
+                string(APPEND version "${CMAKE_MATCH_2}")
+              else()
+                set(version "${CMAKE_MATCH_2}")
+              endif()
+
+              if(CMAKE_MATCH_1 STREQUAL "MagickLibAddendum")
+                break()
+              endif()
             endif()
+          endforeach()
+        endif()
 
-            if(CMAKE_MATCH_1 STREQUAL "MagickLibAddendum")
-              break()
-            endif()
-          endif()
-        endforeach()
-      endif()
+        if(DEFINED version)
+          break()
+        endif()
+      endforeach()
 
       if(DEFINED version)
         break()

Tests/FindImageMagick/Test/CMakeLists.txt

@@ -14,4 +14,7 @@ add_test(NAME test_magick++ COMMAND test_magick++)
 
 add_executable(test_magick_wand main_magick_wand.c)
 target_link_libraries(test_magick_wand ImageMagick::MagickWand)
+if(ImageMagick_VERSION VERSION_GREATER_EQUAL 7)
+  target_compile_definitions(test_magick_wand PRIVATE TEST_IMAGE_MAGICK_7)
+endif()
 add_test(NAME test_magick_wand COMMAND test_magick_wand)

Tests/FindImageMagick/Test/main_magick_wand.c

@@ -1,4 +1,8 @@
-#include <wand/MagickWand.h>
+#ifdef TEST_IMAGE_MAGICK_7
+#  include <MagickWand/MagickWand.h>
+#else
+#  include <wand/MagickWand.h>
+#endif
 
 int main(void)
 {