Building Unfolding tools

Recent versions of Bison (e.g. v3.6.2 in MacPort and v3.5.1 in Ubuntu 20.04) have a new way to detect reduce/reduce conflicts. This affects generating a parser from unflib/pn_parse_hl.y grammar – the following error is reported by Bison: reduce/reduce conflicts: 162 found, 54 expected. A workaround is to change the number of expected reduce/reduce conflicts from 54 to 162.

for Linux

These instructions also work for Windows Subsystem for Linux (WSL).
See WSL documentation for detailed setup instructions.

Install development packages:

sudo apt install gcc gcc-multilib  # GCC v9.3.0
sudo apt install g++ g++-multilib  # G++ v9.3.0
sudo apt install bison flex        # Bison v3.5.1
sudo apt install make dos2unix
sudo apt install libhwloc-dev

Run make cleanall and remove all static libraries (*.a files)
Run make

Binaries produced in Ubuntu 20.04 and 18.04 require Linux kernel v3.2.0 or newer. This may cause problems for EDA servers that often run Red Hat 6 with kernel v2.6.32. A workaround is to configure a build environment under Ubuntu 16.04 instead:

Note that if you are using WSL, then Ubuntu 16.04 needs to be installed manually, via PowerShell:

curl.exe -L -o ubuntu-1604.appx https://aka.ms/wsl-ubuntu-1604
Add-AppxPackage .\Ubuntu_1604.2019.523.0_x64.appx

Install GCC 8 and set it as a default alternative:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt install gcc-8 gcc-8-multilib g++-8 g++-8-multilib
sudo update-alternatives \
  --install /usr/bin/gcc gcc /usr/bin/gcc-8 20 \
  --slave /usr/bin/g++ g++ /usr/bin/g++-8 \
  --slave /usr/bin/gcov gcov /usr/bin/gcov-8

Install other dependencies, excluding Bison (see below):
```
sudo apt install m4 make flex dos2unix libhwloc-dev
```

Build Bison v3.5.1 from source (only v3.0.4 is available from Ubuntu official repo, which is too old):

wget http://ftp.gnu.org/gnu/bison/bison-3.5.1.tar.gz
tar xzfv bison-3.5.1.tar.gz
cd bison-3.5.1
./configure
make
sudo make install

for OSX

Use MacPort to install GCC:

sudo port install gcc8 +universal
#sudo port select --list gcc
sudo port select --set gcc mp-gcc8

Install OpenSSL, Bison and DOS2Unix:

sudo port install bison
sudo port install openssl
sudo port install dos2unix

Use OSX flags:
```
cp flags_osx flags
```
The changes are as follows:
- the flag -static is replaced with -static-libstdc++ -static-libgcc in CFLAGS
- the flags -Wl,–whole-archive and -Wl,–no-whole-archive are removed from CXXFLAGS
Change the number of expected reduce/reduce conflicts from 54 to 162 in unflib/parse_hl.y grammar file:
```
sed -i'' 's/%expect-rr 54/%expect-rr 162/g' unflib/parse_hl.y
```
Run make cleanall and remove all static libraries (*.a files)
Run make

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Building Unfolding tools

for Linux

for OSX