[Issue]: lld: error: undefined symbol: memcpy

[Ashutosh-Londhe]

Problem Description

I am getting lld: error: undefined symbol: memcpy error when compiling with rocm compiler

my command is this:
/ext-home/asl/install/openmpi/rocm5.6/install/bin/mpicxx -O3 -fPIC -Wall -g -std=c++11 -fopenmp -fopenmp -fopenmp=libomp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx908 -DOPS_MPI -I/ext-home/asl/OPS_cg/OPS/ops/c/include -L/ext-home/asl/OPS_cg/OPS/ops/c/lib/clang laplace2d_ops.cpp -I. ./openmp_offload/openmp_offload_kernels.cpp -lops_mpi_ompoffload -o laplace2d_mpi_ompoffload

i have set CC=clang and CXX=clang++
i am using rocm5.6.0

Operating System

Ubuntu 20.04.6

CPU

AMD EPYC 7543 32-Core Processor

GPU

AMD Instinct MI100

ROCm Version

ROCm 5.6.0

ROCm Component

No response

Steps to Reproduce

No response

(Optional for Linux users) Output of /opt/rocm/bin/rocminfo --support

No response

Additional Information

No response

[lamb-j]

Thanks for reporting, I'm looking into this.

Can you provide the source files used in your compilation command, or are they available somewhere I can access?

[lamb-j]

[AMD Official Use Only - General] Hi Mark, Do we have anyone that works closely with MPI+Rocm? I’m trying to reproduce this issue, and I’m looking for resources on building rocm-supported OpenMPI. Thanks, Jacob From: Ashutosh Londhe ***@***.***> Sent: Tuesday, February 20, 2024 1:05 PM To: ROCm/ROCm-CompilerSupport ***@***.***> Cc: Subscribed ***@***.***> Subject: [ROCm/ROCm-CompilerSupport] [Issue]: lld: error: undefined symbol: memcpy (Issue #65) Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding. Problem Description I am getting lld: error: undefined symbol: memcpy error when compiling with rocm compiler my command is this: /ext-home/asl/install/openmpi/rocm5.6/install/bin/mpicxx -O3 -fPIC -Wall -g -std=c++11 -fopenmp -fopenmp -fopenmp=libomp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx908 -DOPS_MPI -I/ext-home/asl/OPS_cg/OPS/ops/c/include -L/ext-home/asl/OPS_cg/OPS/ops/c/lib/clang laplace2d_ops.cpp -I. ./openmp_offload/openmp_offload_kernels.cpp -lops_mpi_ompoffload -o laplace2d_mpi_ompoffload i have set CC=clang and CXX=clang++ i am using rocm5.6.0 Operating System Ubuntu 20.04.6 CPU AMD EPYC 7543 32-Core Processor GPU AMD Instinct MI100 ROCm Version ROCm 5.6.0 ROCm Component No response Steps to Reproduce No response (Optional for Linux users) Output of /opt/rocm/bin/rocminfo --support No response Additional Information No response — Reply to this email directly, view it on GitHub<#65>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AJMFR2Y4NRKPAGCM23E6ZY3YUUFWLAVCNFSM6AAAAABDR3OEHGVHI2DSMVQWIX3LMV43ASLTON2WKOZSGE2DKMRXHAYDEMY>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[Ashutosh-Londhe]

Hi,

I am trying this with OpenSource DSL library OPS
https://github.com/OP-DSL/OPS.git

After cloning, you first need to install the OPS C library, for which instructions can be found at
https://ops-dsl.readthedocs.io/en/latest/installation.html#using-makefiles
you can use the file source_amd_rocm-5.4.3_pythonenv present in OPS/scripts folder for setting up the required environment for Make

once the library build is finished, you can try building laplace example available in
"OPS/apps/c/laplace2d_tutorial/step7"
1. Open the Makefile and uncomment the following line (second last) include $(OPS_INSTALL_PATH)/../makefiles/Makefile.c_app_legacy #uncomment and comment the last line include $(OPS_INSTALL_PATH)/../makefiles/Makefile.c_app #comment 2. run the command to build MPI+OpenMP_offload target make laplace2d_mpi_ompoffload

[Ashutosh-Londhe]

Hi @lamb-j

I was able to resolve this issue. I had this memcpy inside an OpenMP offload loop so it was expecting a device version for the same.
I was earlier trying with PGI compiler, where i think they had it so not coming across this error with PGI.
After replacing memcpy with normal for loop, the error is resolved.