diff --git a/CMakeLists.txt b/CMakeLists.txt
index 238046952..7ac5d16f6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,6 +30,11 @@ if (CMAKE_GENERATOR STREQUAL "Ninja" AND
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdiagnostics-color=always")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
 endif()
+# Enable a whole bunch of warnings, but turn off:
+# - implicit fallthrough because that does not recognize some cases where it's desired (and I *really* want this one!)
+# - comment because we use a bunch of those, and they're not really all that harmful.
+# - address, because that occurs for our mkostemp check (weak-linking requires us to compare `&mkostemp == nullptr`).
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wimplicit-fallthrough=0 -Wno-comment -Wno-address")
 
 # Disable exception handling.
 ADD_COMPILE_OPTIONS(-fno-exceptions)