diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -132,8 +132,10 @@
 	# Enable stack protection
 	add_cxx_compiler_flags(-fstack-protector-all -Wstack-protector)
 
-	# Enable some buffer overflow checking
-	add_compiler_flags(-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2)
+	# Enable some buffer overflow checking, except in -O0 builds which
+	# do not support them
+	add_compiler_flags(-U_FORTIFY_SOURCE)
+	add_compile_options($<$<NOT:$<CONFIG:Debug>>:-D_FORTIFY_SOURCE=2>)
 
 	# Enable ASLR (these flags are primarily targeting MinGw)
 	add_linker_flags(-Wl,--dynamicbase -Wl,--nxcompat -Wl,--high-entropy-va)
@@ -203,10 +205,15 @@
 
 if(ENABLE_WERROR)
 	add_compiler_flags(
-		-Werror=return-type
-		-Werror=switch
-		-Werror=thread-safety-analysis
-		-Werror=vla
+		# turns warnings into errors
+		-Werror
+		# except for the following
+		-Wno-error=cast-align
+		-Wno-error=deprecated-copy
+		-Wno-error=deprecated-declarations
+		-Wno-error=implicit-int-float-conversion
+		-Wno-error=maybe-uninitialized
+		-Wno-error=stringop-truncation
 	)
 endif()