TeXniKK opened a new issue #13303: mxnet-cpp package cross-compilation fails with OSError: "wrong ELF class: ELFCLASS32" URL: https://github.com/apache/incubator-mxnet/issues/13303 ## Description mxnet-cpp package cross-compilation fails with OSError: "wrong ELF class: ELFCLASS32" ## Environment info (Required) Host system: Ubuntu 18.04.1 LTS 4.15.0-38-generic x86_64 Target system: ARM Cortex-A9 CPU ``` What to do: 1. Configure Buildroot for target system 2. Add MxNet as a CMake Buildroot package 3. Compile package ``` ## Build info (Required if built from source) Compiler (gcc/clang/mingw/visual studio): arm-buildroot-linux-gnueabihf-gcc-7.3.0 MXNet commit hash: 85fefa8c7291b556057ae685a5883c3f6a175c18 Build config: -DBUILD_CPP_EXAMPLES=OFF -DUSE_MKLDNN=OFF \ -DTHREADS_PTHREAD_ARG=OFF -DUSE_OPENCV=OFF \ -DUSE_OPENMP=OFF -DUSE_CUDA=OFF -DUSE_CUDNN=OFF \ -DUSE_SSE=OFF -DUSE_CPP_PACKAGE=ON -DUSE_LIBJPEG_TURBO=OFF \ -DENABLE_CUDA_RTC=OFF ## Error Message: >>> mxnet 1.3.0 Building .... [ 86%] Building C object CMakeFiles/mxnet.dir/dummy.c.o [ 93%] Built target mxnet_unit_tests [ 93%] Linking CXX shared library libmxnet.so [ 93%] Built target mxnet Scanning dependencies of target cpp_package_op_h Running: OpWrapperGenerator.py Traceback (most recent call last): File "OpWrapperGenerator.py", line 428, in <module> raise(e) OSError: buildroot/output/build/mxnet-1.3.0/libmxnet.so: wrong ELF class: ELFCLASS32 cpp-package/CMakeFiles/cpp_package_op_h.dir/build.make:58: recipe for target 'cpp-package/CMakeFiles/cpp_package_op_h' failed make[4]: *** [cpp-package/CMakeFiles/cpp_package_op_h] Error 1 CMakeFiles/Makefile2:541: recipe for target 'cpp-package/CMakeFiles/cpp_package_op_h.dir/all' failed make[3]: *** [cpp-package/CMakeFiles/cpp_package_op_h.dir/all] Error 2 ## Minimum reproducible example + Steps to reproduce 1. Configure Buildroot for target system 2. Add MxNet as a CMake Buildroot package: MXNET_VERSION:=1.3.0 MXNET_SITE:=https://github.com/apache/incubator-mxnet.git MXNET_SITE_METHOD = git MXNET_GIT_SUBMODULES = YES MXNET_INSTALL_STAGING = YES MXNET_CONF_OPTS = -DBUILD_CPP_EXAMPLES=OFF -DUSE_MKLDNN=OFF \ -DTHREADS_PTHREAD_ARG=OFF -DUSE_OPENCV=OFF \ -DUSE_OPENMP=OFF -DUSE_CUDA=OFF -DUSE_CUDNN=OFF \ -DUSE_SSE=OFF -DUSE_CPP_PACKAGE=ON -DUSE_LIBJPEG_TURBO=OFF \ -DENABLE_CUDA_RTC=OFF $(eval $(cmake-package)) 3. Compile package ## What have you tried to solve it? 1. Checked OpWrapperGenerator.py source code. It tries to invoke Python of the *host* system (x86_64) and perform cdll.libmxnet = cdll.LoadLibrary(sys.argv[1]) for library built for *target*. Eventually host Python know nothing about ARM library format.
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