# WARN_CFLAGS and WARN_CXXFLAGS.
m4_define([WARN_FLAGS_COMMON_LIST], [ dnl
-Wall dnl
+ -Wnull-dereference dnl
+ -Wundef dnl
+ -Wredundant-decls dnl
+ -Wmissing-noreturn dnl
+ -Wlogical-op dnl
dnl We currently get this warning when building with Clang:
dnl
dnl /usr/include/setjmp.h:54:12: error: declaration of built-in function '__sigsetjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header <setjmp.h>. [-Werror,-Wincomplete-setjmp-declaration]