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AC_DEFUN([AX_ARG_ENABLE_WARNINGS],[
AC_ARG_ENABLE([warnings],[AS_HELP_STRING([--enable-warnings],[Enable compiler warnings.])],[warnings="$enableval"],[warnings="no"])
AS_IF([test "$warnings" = "yes"], [
AX_APPEND_COMPILE_FLAGS([-Wall])
AX_APPEND_COMPILE_FLAGS([-Wbad-function-cast])
AX_APPEND_COMPILE_FLAGS([-Wcast-align])
AX_APPEND_COMPILE_FLAGS([-Wcast-qual])
AX_APPEND_COMPILE_FLAGS([-Wclobbered])
AX_APPEND_COMPILE_FLAGS([-Wduplicated-cond])
AX_APPEND_COMPILE_FLAGS([-Wempty-body])
AX_APPEND_COMPILE_FLAGS([-Wignored-qualifiers])
AX_APPEND_COMPILE_FLAGS([-Wlogical-op])
AX_APPEND_COMPILE_FLAGS([-Wmissing-declarations])
AX_APPEND_COMPILE_FLAGS([-Wmissing-field-initializers])
AX_APPEND_COMPILE_FLAGS([-Wmissing-include-dirs])
AX_APPEND_COMPILE_FLAGS([-Wmissing-parameter-type])
AX_APPEND_COMPILE_FLAGS([-Wmissing-prototypes])
AX_APPEND_COMPILE_FLAGS([-Wnested-externs])
AX_APPEND_COMPILE_FLAGS([-Wold-style-declaration])
AX_APPEND_COMPILE_FLAGS([-Woverride-init])
AX_APPEND_COMPILE_FLAGS([-Wpointer-arith])
AX_APPEND_COMPILE_FLAGS([-Wredundant-decls])
AX_APPEND_COMPILE_FLAGS([-Wshadow])
AX_APPEND_COMPILE_FLAGS([-Wshift-negative-value])
AX_APPEND_COMPILE_FLAGS([-Wsign-compare])
AX_APPEND_COMPILE_FLAGS([-Wtype-limits])
AX_APPEND_COMPILE_FLAGS([-Wundef])
AX_APPEND_COMPILE_FLAGS([-Wuninitialized])
AX_APPEND_COMPILE_FLAGS([-Wwrite-strings])
])
])
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