Build system dependencies

[treeswift]

After accidentally nuking my guest drive (sounds funny, but silent wipe of the Linux installation when physical paths change is a WSL feature), I used it as an opportunity to verify the build bootstrapping process. Here is what I found.

My distro is Ubuntu 20.04. My system already had git, gcc and python3-pip.

My initial make output was:

Missing requirement: 7za
Missing requirement: autoconf
Missing requirement: automake
Missing requirement: autopoint
Missing requirement: bison
Missing requirement: flex
Missing requirement: gdk-pixbuf-csource
Missing requirement: gperf
Missing requirement: intltoolize
Missing requirement: libtool
Missing requirement: libtoolize
Missing requirement: lzip
Missing requirement: ruby

I got most of the dependencies installed w/ sudo apt install by using the names from the list as literal package names. However, there were a few exceptions:

• gdk-pixbuf-csource is provided by libgtk2.0-dev
• libtool is provided by libtool-bin and libtoolize is provided by libtool
• intltoolize seems to be silently provided by intltool
• 7za is provided by p7zip-full (simply p7zip isn't enough)

Also python was not listed as a requirement. I had to install python3 and python-is-python3.

We may want to update docs/index.html (I can do that). I propose to make those note distro-specific and covering at least major Ubuntu LTS distros; others can add theirs.

[treeswift]

Also: meson.

pip3 install meson --upgrade

Should be from PIP, not from the distro repo, as the distro repo is outdated and causes the allow-shlib-undefined issue.

[pahaze]

This is fixed in the latest MXE version but since I was having trouble, I didn't attempt to even migrate it in yet. However, there's also a dependency issue with the official MXE too... You need PCRE's dev packages which for some reason is NOT included in the index pages.

[treeswift]

Aaah IC. Linking to issue #2.

[pahaze]

Also python was not listed as a requirement. I had to install python3 and python-is-python3.

Sadly this actually does not work correctly in our current repository version when using Ubuntu 22.04. This version of MXE expects python to be python2 (python-is-python2 package on Ubuntu 20.04)

[pahaze]

However, it does seem they moved to Python 3 in the new version, thankfully.

[treeswift]

This version of MXE expects python to be python2

Ouch, nice of them. How much does Python3 break?

[pahaze]

If I'm correct, maybe... 2 or 3 packages? I don't remember. Probably easily fixable, but if I remember correctly they were all meson packages instead of CMake packages.

[treeswift]

Then I'll go with python3 for now until all meson packages are ironed out. We can update this part of the docs once latest mxe is merged downstream.

[pahaze]

Good with me. I've got latest MXE going on my system now but likely won't do too much today.

[treeswift]

Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR)
CMake Error at Utilities/cmcurl/CMakeLists.txt:454 (message):
  Could not find OpenSSL.  Install an OpenSSL development package or
  configure CMake with -DCMAKE_USE_OPENSSL=OFF to build without OpenSSL.

OpenSSL for host CMake build. Goodness. Do we need it, given that mxe builds are networkless by policy?

[pahaze]

What!? 🤦
So messy...

[treeswift]

The reason for CMake to include OpenSSL is that it can retrieve dependencies over network.
We may want that for its target build, so that it were fully functional, but host CMake is only built for use within mxe.
I am hence removing the OpenSSL requirement for the host and keeping it for the target.

[treeswift]

sudo pip install mako-render

[treeswift]

blas/lapack need cross-compiling gfortran

[treeswift]

iconv (until we build one for the host)

I stand corrected — it's present in mingw (but doesn't like utf{8|16} without the dash, utf-8 and utf-16 to the rescue).

[pahaze]

SUSE's current dependency status (even after installing needed libraries on MXE's page):

Missing dependencies -
- python
- zip (recent? zip wasn't missing until recently)

Broken dependencies (no providers) -
- libgcc46-32bit
- libgomp46-32bit
- libstdc++46-devel-32bit

Will update this comment as I find more (if I do, anyway).