vp-build/common/environment/configure/hardening.sh

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# Enable SSP and FORITFY_SOURCE=2 by default.
CFLAGS=" -fstack-protector-strong -D_FORTIFY_SOURCE=2 $CFLAGS"
CXXFLAGS="-fstack-protector-strong -D_FORTIFY_SOURCE=2 $CXXFLAGS"
# Enable as-needed and relro by default.
LDFLAGS="-Wl,--as-needed -Wl,-z,relro $LDFLAGS"
if [ -z "$nopie" ]; then
_GCCSPECSDIR=${XBPS_COMMONDIR}/environment/configure/gccspecs
CFLAGS="-specs=${_GCCSPECSDIR}/hardened-cc1 $CFLAGS"
CXXFLAGS="-specs=${_GCCSPECSDIR}/hardened-cc1 $CXXFLAGS"
# We pass -z relro -z now here too, because libtool drops -specs...
LDFLAGS="-specs=${_GCCSPECSDIR}/hardened-ld -Wl,-z,relro -Wl,-z,now $LDFLAGS"
fi