Avoid big-scary cmake warning for optional libs

zander · zander · commit 8671e50ff379 · 2022-12-01T11:03:23.000+01:00
As the libs are optional, lets avoid the big CMake warning when the opencv
library or Qt is not found. It mostly has info for the maintainers, not for
people building this.

Instead add a one line message stating the cause and effect.
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
@@ -23,7 +23,11 @@ if (BUILD_READERS)
 endif()
 
 if (BUILD_READERS)
-    find_package(Qt5 COMPONENTS Gui Multimedia Quick)
+    find_package(Qt5 COMPONENTS Gui Multimedia Quick QUIET)
+    if (NOT (Qt5_FOUND OR Qt6_FOUND))
+        message("INFO: Qt (Gui/Multimedia/Quick) not found, skipping Qt examples")
+    endif()
+
     set(CMAKE_AUTOMOC ON)
     set(CMAKE_AUTORCC ON)
 
@@ -37,10 +41,12 @@ if (BUILD_READERS)
         target_link_libraries(ZXingQtCamReader ZXing::ZXing Qt::Gui Qt::Multimedia Qt::Quick)
     endif()
 
-    find_package(OpenCV)
+    find_package(OpenCV QUIET)
     if (OpenCV_FOUND)
         add_executable (ZXingOpenCV ZXingOpenCV.cpp)
         target_include_directories (ZXingOpenCV PRIVATE ${OpenCV_INCLUDE_DIRS})
         target_link_libraries (ZXingOpenCV ZXing::ZXing ${OpenCV_LIBS})
+    else ()
+        message("INFO: OpenCV not found, skipping ZXingOpenCV example")
     endif()
 endif()
