Hi Thomas, The Linaro gcc 4.9 is correct when it gets to __GNUC_MINOR__, used a test application. Its actually 4.9.2.
Tried a newer Linaro tool chain, turned out to be a bit more complicated since that does not work on RHEL6, is however a success. With Linaro 5.3 one can cross compile dpdk fine with no errors, though the rte_byteorder.h file still points to arm's version, but pmdinfogen builds. Probably should still fix both issues just to keep the base clean. At least I have a workaround in the interim. Thanks for the help. Thanks, Michael On Tue, Sep 13, 2016 at 11:07 AM, Thomas Monjalon <thomas.monjalon at 6wind.com > wrote: > 2016-09-13 07:45, Michael Wildt: > > Hi Thomas, > > > > Appreciate the assistance. Please see inline. > > > > > > On Tue, Sep 13, 2016 at 5:03 AM, Thomas Monjalon < > thomas.monjalon at 6wind.com> > > wrote: > > > > > Hi, > > > > > > 2016-09-12 22:20, Michael Wildt: > > > > I'm attempting to cross compile DPDK on an x86 for an ARM64 target. > This > > > > fails in the following areas, using latest dpdk as of 9/12. When > > > compiling > > > > natively there are no issues. > > > > > > Your analysis below seems good. > > > Interestingly, I do not see such error (don't know why). > > > Please could you share the commands you are using? > > > > > > > Sure can. > > > > make config T=arm64-armv8a-linuxapp-gcc CROSS=/projects/ccxsw/ > > toolchains/gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux/ > bin/aarch64-linux-gnu- > > ARCH=arm64 > > > > make T=arm64-armv8a-linuxapp-gcc CROSS=/projects/ccxsw/ > > toolchains/gcc-linaro-aarch64-linux-gnu-4.9-2014.09_linux/ > bin/aarch64-linux-gnu- > > ARCH=arm64 RTE_KERNELDIR=/projects/kernel > > > > > > - librte_vhost, fails with: > > > > > > > > /projects/dpdk_latest/lib/librte_vhost/vhost_user/virtio- > > > net-user.c:250:23: > > > > error: array subscript is above array bounds [-Werror=array-bounds] > > > > rvq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ]; > > > [...] > > > > - buildtools/pmdinfogen, fails with: > > > > > > > > == Build buildtools/pmdinfogen > > > > HOSTCC pmdinfogen.o > > > > /projects/dpdk_test_wget/dpdk-16.07/build/include/rte_byteorder.h: > > > > Assembler messages: > > > > /projects/dpdk_test_wget/dpdk-16.07/build/include/rte_ > byteorder.h:53: > > > > Error: no such instruction: `rev16 %bx,%bx' > > > [...] > > > > - The issue is due to the rte_byteorder.h file which gets > > > > symlink'ed with the ARM version at the beginning of the build. > > > > The pmdinfogen is always compiled for x86 thus the asm is failing. > > It is definitely something to fix. > In the meantime, you should be able to compile DPDK by using a more recent > toolchain. This error is in: > > /* fix missing __builtin_bswap16 for gcc older then 4.8 */ > #if !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) > > I know you are using gcc-4.9 but maybe __GNUC_MINOR__ is wrong in yours. > >
