# Add -Wstack-usage if the compiler is a sufficiently recent version of GCC.
AC_EGREP_CPP([^[0-4]$],[__GNUC__],,GCC_WARN_CFLAGS="$GCC_WARN_CFLAGS -Wstack-usage=262144")
+# Set WARN_WRITE_STRINGS if the compiler supports -Wwrite-strings.
+WARN_WRITE_STRINGS=""
+AC_EGREP_CPP([^[0-3]$],[__GNUC__],,WARN_WRITE_STRINGS="-Wwrite-strings")
AC_ARG_ENABLE(werror,
[ --enable-werror treat compile warnings as errors],
AC_SUBST(WARN_CFLAGS)
AC_SUBST(NO_WERROR)
+ AC_SUBST(WARN_WRITE_STRINGS)
])