Modelsim 32-bit invalid ELF header

Just updated my local cocotb installation from git and ran into an issue:

System:

• Centos 7 (64-bit)
• Intel Modelsim 2020.3 (32-bit)
• Installed anaconda 32-bit system as per instructions: https://github.com/cocotb/cocotb/wiki/Tier-2-Setup-Instructions
• Installed cocotb from git: pip install -v -e ./cocotb
• Cocotb version: 3a47227170d872e8bac1de9af3b5547f298d2bdb

Adder example ouput:

make results.xml
make[1]: Entering directory `/home/cocotb/examples/adder/tests'
set -o pipefail; MODULE=test_adder TESTCASE= TOPLEVEL="work.adder" \
GPI_EXTRA= TOPLEVEL_LANG=verilog \
/data/tools/intelFPGA_pro/20.3/modelsim_ase/linux/vsim -c  -do sim_build/runsim.do  2>&1 | tee sim_build/sim.log
Reading pref.tcl

# 2020.3

# do sim_build/runsim.do
# Model Technology ModelSim - Intel FPGA Edition vmap 2020.3 Lib Mapping Utility 2020.07 Jul 22 2020
# vmap -c 
# ** Warning: vmap will not overwrite local modelsim.ini.
# Model Technology ModelSim - Intel FPGA Edition vmap 2020.3 Lib Mapping Utility 2020.07 Jul 22 2020
# vmap work sim_build/work 
# Modifying modelsim.ini
# Model Technology ModelSim - Intel FPGA Edition vlog 2020.3 Compiler 2020.07 Jul 22 2020
# Start time: 16:34:55 on Feb 05,2021
# vlog -work work "+define+COCOTB_SIM" -sv -timescale 1ns/1ps -mfcu "+acc" /home/cocotb/examples/adder/tests/../hdl/adder.sv 
# -- Compiling module adder
# 
# Top level modules:
#   adder
# End time: 16:34:55 on Feb 05,2021, Elapsed time: 0:00:00
# Errors: 0, Warnings: 0
# vsim -onfinish exit -pli "/home/cocotb/cocotb/libs/libcocotbvpi_modelsim.so" sim_build/work.adder 
# Start time: 16:34:55 on Feb 05,2021
# Loading sv_std.std
# Loading sim_build/work.adder
# Loading /home/cocotb/cocotb/libs/libcocotbvpi_modelsim.so
#      -.--ns ERROR    cocotb.gpi                         ..s/cocotb_utils.cpp:69   in utils_dyn_open                  Unable to open lib /home/.conda/envs/py3_32/lib/libpython3.7m.a: /home/.conda/envs/py3_32/lib/libpython3.7m.a: invalid ELF header
#      -.--ns INFO     cocotb.gpi                         ../gpi/GpiCommon.cpp:105  in gpi_print_registered_impl       VPI registered
# End time: 16:34:55 on Feb 05,2021, Elapsed time: 0:00:00
# Errors: 0, Warnings: 0
ERROR: results.xml was not written by the simulation!
make[1]: *** [results.xml] Error 1
make[1]: Leaving directory `/home/cocotb/examples/adder/tests'
make: *** [sim] Error 2

Also tried some older cocotb version (which gives the same error as in the log above): 331b879e39c587e94837f73eb05f73c04ec20c6e

This is the most recent cocotb version that runs adder example on modelsim without issues: 50418e54f000316257404134a57557ffb877e2c8

Any suggestions? Thanks

[elgorwi]

Thanks for the patch @ktbarrett. Just tried it and everything seems to be working on my system.

[themperek]

Could you try out this change in cocotb/_vendor/find_libpython/init.py? ktbarrett/find_libpython@95c37b3

For me, it seems to work with this change.