Makefile + proper packaging

[fagg]

I do not know whether this is of interest, but thought I would share it anyway.

1. Adds a third_party directory containing the appropriate headers from stb. Also adds an acknowledgement file (separate README.md) stating that they are licensed under different terms to the base QOI library (either public domain or MIT).
2. Defines a Makefile to make it easier to build and install the conversion and benchmark tooling.
3. Adds some basic instructions to README.md.

I can only test this on OpenBSD right now, however I did test it with GNU Make (as well as BSD Make) and it is working fine here. There is no reason that this should not work on Linux or Mac provided my memory serves correctly. I cannot test on Mac, but I can probably test on Linux at some point soon.

I will not be offended if you don't want this - I am doing this mainly to make it easier for myself as I am intending to package this for OpenBSD ports, and just thought I would share. :-)

[kvuj]

Fairly certain -mtune=native is implied when using -march=native but at this point, we're splitting hairs.

https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html

[phoboslab]

Thanks for this PR! I believe it's a good idea. I just wanted to give a heads up that I probably wont find the time to test/review it until next year. Likewise with the fixes for OpenBSD.

Thanks for your patience and happy holidays :)

[walksanatora]

if there is one thing that I need to note it is that after installing libstb-dev on linux mint i was still unnable to compile
any ideas why
(here is the make error)

cc -O3 -march=native -mtune=native -Wall -Wextra -pedantic -Ithird_party `pkg-config --cflags libpng` `pkg-config --libs libpng` -o qoibench qoibench.c
qoibench.c:41:10: fatal error: stb_image.h: No such file or directory
   41 | #include "stb_image.h"
      |          ^~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:8: qoibench] Error 1

[amstan]

This seems pretty redundant/boilerplatey. At least change it to "?="

But i really don't know why anyone would have to change install or rm executables.

[amstan]

qoiconv does not use libpng

[amstan]

Perhaps use -I/usr/include/stb instead of third_party, see #188 for others saying the same.

[amstan]

BTW, I also wrote a Makefile for the normal qoi tools in this repo: https://github.com/amstan/qoi-fpga/blob/fpga/Makefile

But a few things in my implementation (like splitting compilation of qoiconv and qoibench into a .o file too) only make sense when you're doing the weird stuff I am.

[BenBE]

Looking at the Makefile I noticed that it does not quite follow the requirements needed for packaging on Debian/Ubuntu: In particular it lacks support for the ${DESTDIR} variable. Also ${prefix} should be set to /usr/local by default, as is customary following the standards for placement of custom files. For normal installation as part of a distribution like Debian, having a look at the Filesystem Hierarchy Standard does not hurt.

Another feature that'd be nice to have is a precompiled static and dynamic library which other programs can link. The current Makefile installs the header (which also includes the source needed for actual use), but it would be much less surprising if the header actually only contained the pure interface definitions.

While using autotools for this project is likely massive overkill, it would (except for the split of header and implementation) avoid all the above mentioned issues. Using cmake could be another option.

[fagg]

Somebody else is more than welcome to pick this up, but I frankly have neither the time or interest to continue with this.