Ability to compile without downloading afresh

[nmoinvaz]

It might be a good idea to add an argument with argparse to ./a_compile.py that would not delete and redownload the repositories.

[neurolabusc]

See my comments for here.

1. Run script a_compile.py once only to download and install reference variations of pigz and the testing corpus.

a_compile.py

2. Download the custom zlib you want to test and modify once, e.g.

git clone --branch fixes/gh-536-wsize https://github.com/nmoinvaz/zlib-ng.git

3. Compile a new version of the zlib locally and rebuild pigz for this custom library, copying the new copy of pigz to the exe folder. Assuming the previous step created the folder zlib-ng and you want the new version of pigz to be called pigzng the Unix commands are

#!/bin/bash
cd zlib-ng
make clean
./configure --static --zlib-compat
make
cd ../pigz/build
rm -rf *
cmake -DZLIB_IMPLEMENTATION=Custom -DZLIB_ROOT=../../zlib-ng ..
make
cp ./bin/pigz ../../exe/pigzng

4. Run the scripts b_speed_threads.py, c_decompress.py, d_speed_size.py as desired to test the performance of your local zlib. If you are unhappy, you can edit the files of your zlib and repeat steps 3 and 4.