The project Keccak_PPL has several VHDL compilation issues (Fails to synthesize).

[alaindargelas]

Original project:
https://cryptography.gmu.edu/athena/sources/2012_03_23/Keccak/without_padding/Keccak_PPL.zip
Attached in the zip, the modified version with comments.

We tried to circumvent some issues by modifying the VHDL code.
Ideally we would like to use this package as-is.
Eventually we reached the following with the modified code and we are stuck:

******************** GHDL Bug occurred ***************************
Please report this bug on https://github.com/ghdl/ghdl/issues
GHDL release: 3.0.0-dev (2.0.0.r917.g93a8884) [Dunoon edition]
Compiled with unknown compiler version
Target: x86_64-pc-linux-gnu
/home/alain/RapidSilicon/ApplicationsAndValidation/all_designs/customer_designs/MC-designs/keccak_piped_ghdl/keccak_piped/run_1/synth_1_1/analysis/
Command line:

Exception CONSTRAINT_ERROR raised
Exception information:
raised CONSTRAINT_ERROR : synth-vhdl_expr.adb:536 invalid data

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keccak_piped.modified.tar.gz