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legup_notes.md

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Install 32-bit c++ libraries

Legup wants to use 32-bit (-m32), so make sure that 32-bit libraries are included:

sudo apt-get install g++-multilib

Symptoms are:

vagrant@vagrant-ubuntu-trusty-64:/mnt/_dt10_/documents/papers/working/ideas/hls_recursion/src$ clang++ -std=c++11 state_machine_self_recursion_test.cpp  -I ../include -emit-llvm -c  -fno-builtin -I /home/vagrant/legup/examples/lib/include/  -m32
In file included from state_machine_self_recursion_test.cpp:3:
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/cstdio:41:10: fatal error:
      'bits/c++config.h' file not found
#include <bits/c++config.h>
         ^
1 error generated.

Patch GenerateRTL.cpp

Apply src/eval/legup/GenerateRTL.patch to legup/llvm/lib/Target/Verilog/GenerateRTL.cpp

This avoids situations where legup tries to create dot files with pathnames that are too long, and then fails when it can't write to them.

Setup full modelsim

The output of recursive programs will take forever to simulate due to auto-slowdown for large programs in the modelsim starter edition

Update cmake

The default cmake on the legupUbuntu vm is too old to support certain things like c++11 features for compilers. It needs to be updated to something more recent. e.g. http://askubuntu.com/q/610291. I used:

sudo add-apt-repository ppa:george-edison55/cmake-3.x
sudo apt-get update
sudo apt-get upgrade

This has the side effect of upgrading a number of other things, but doesn't seem to affect the integrity of the legup build.

While you're at it (or ideally before), the VM can be cleaned up a bit:

sudo apt-get remove --purge libreoffice*
sudo apt-get remove --purge thunderbird*
sudo apt-get clean
sudo apt-get autoremove

Not that it really matters that much given how big quartus and modelsim are.