Enable strict compile flags

CMakeLists.txt

@@ -54,3 +54,16 @@ install(TARGETS appSolitare
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
 )
+
+# Enable strict compile flags for warnings
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+  target_compile_options(appSolitare PRIVATE
+    # Enable high-level warnings
+    -Wall -Wextra -pedantic
+    # Enable warnings as errors
+    -Werror
+  )
+elseif(MSVC)
+  # For MSVC, use /W4 for strict warnings and /WX to treat warnings as errors
+  target_compile_options(appSolitare PRIVATE /W4 /WX)
+endif()