* kipade: >>> "/opt/arm-toolchain/linux/linaro/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.3.1/../../../. >>> ./arm-linux-gnueabihf/lib/libstdc++.so: undefined reference to `clock_gettime@GLIBC_2.17' > thanks for your reply. my link cmd is: > arm-linux-gnueabihf-g++ main.o -L ../arm_common/build/lib/ -larmcomm -pthread -lelf -ldl -lrt This doesn't look particularly suspicious. You need to double-check that your cross-compiler version matches the glibc version you have installed for its use. The error message suggests that you are using an outdated glibc version that predates the one that was used to build GCC and libstdc++. (It's also possible that you are not trying to link against glibc at all, but in that case, more undefined symbols would show up, I think.) (I assume this is a cross-compilation environment, so there's no risk that there are Arm libraries on the host.)
