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Syrone Wong
a135d9c41e
If we already defined `CFLAGS=-D_FORTIFY_SOURCE=1`, it will still check `-D_FORTIFY_SOURCE=2` and add it to CPPFLAGS. In this case, we redefine `_FORTIFY_SOURCE` to both 1 and 2 if compiler accepts `-D_FORTIFY_SOURCE=2`. Fix this issue by checking whether `_FORTIFY_SOURCE` was defined or not. If defined, do nothing. If not, then check `-D_FORTIFY_SOURCE=2`. BTW, OpenWrt's buildroot uses `-D_FORTIFY_SOURCE=1` for most targets by default.
See README.markdown