build: Silence MacOS linker/ar/ranlib warnings

CMakeLists.txt

@@ -9,6 +9,15 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_AUTOUIC ON)
 
+
+# Ignore some irritating warnings on MacOS
+add_link_options(-Wl,-no_warn_duplicate_libraries)
+# https://stackoverflow.com/questions/4929255/building-static-libraries-on-mac-using-cmake-and-gcc
+set(CMAKE_C_ARCHIVE_CREATE   "<CMAKE_AR> Scr <TARGET> <LINK_FLAGS> <OBJECTS>")
+set(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Scr <TARGET> <LINK_FLAGS> <OBJECTS>")
+set(CMAKE_C_ARCHIVE_FINISH   "<CMAKE_RANLIB> -no_warning_for_no_symbols -c <TARGET>")
+set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -no_warning_for_no_symbols -c <TARGET>")
+
 # Enable sanitizers in debug builds
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")
     add_compile_options(-fsanitize=address,undefined -g)