openwrt/config/check-hostcxx.sh

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cat << EOF | "$STAGING_DIR_HOST/bin/g++" -c -x c++ -o /dev/null - >/dev/null 2>&1
#if __clang__
#if __clang_major__ < $3
#error "clang too old"
#endif
#else
#if __GNUC__ < $1 || (__GNUC__ == $1 && (__GNUC_MINOR__ < $2))
#error "gcc too old"
#endif
#endif
EOF
[ $? -eq 0 ] && echo y || echo n