## (Solved) How the Latest Wine-Staging Release, for Debian, Introduces a Packaging Problem: Unresolved Dependencies.

One piece of software which many Linux users benefit from is called “Wine”, which is an acronym that stands for ‘Wine Is Not an Emulator’ . This software allows some Windows programs to run under Linux, but has recently been made more powerful, to allow graphics-intensive games to run as well. The version of wine which I’ve been subscribing to is called ‘wine-staging’ , and contains the latest, bleeding-edge features that Wine is to contain, at any later point down the road.

But as I’ve been receiving updates to wine-staging, the latest update would have taken all my computers from version 4.0-rc2, to version 4.0-rc4, which means, ‘…Release Candidate 4′ . At that point, some of my computers could not install the update, because of unresolved package dependencies.

Apparently what’s been happening with Wine-Staging is twofold:

1. The original maintainers are no longer running the project, which also means that Wine is in the midst of a Code Freeze, and that present updates may offer fewer or no new features, from what Linux users are used to, and
2. In the interest of allowing the Windows games with the highest graphics requirements to run (potentially), the devs have nevertheless created a dependency of the latest Wine packages, on the OpenCL packages that install OpenCL natively under Linux.

‘OpenCL’ is a user-side API, which also requires system-side drivers for the specific graphics hardware, and which allows greatly parallel computations to be carried out on the GPU, instead of on the CPU. Apparently, some games use either ‘OpenCL’ or ‘CUDA’ these days, in order to incorporate complex Physics simulations into the game.

(I will assume that the version of CUDA which Wine emulates, requires OpenCL to be installed on the side of Linux.)

The problem under Debian which I’ve detected is, that the newly-introduced dependency of ‘wine-staging-amd64′ (as an example) is simply mainly:

‘ocl-icd-libopencl1′

Which means, that Wine will now insist on using the generic OpenCL drivers, that were developed for and by the Linux community, while not allowing the use of proprietary OpenCL drivers, that are closed-source, and that were developed by the manufacturers of each graphics card.

The problem with this is, that as users, we may only have one or the other OpenCL driver-set installed. We cannot install both the generic and the proprietary drivers. When we try to update Wine-Staging now, doing so will try to install the package above, which will also try to ‘kick out’ , any proprietary packages we may have installed, that provide OpenCL.

## Understanding the long long data-type with C++

One of the conventions which I was taught when first learning C++, was that, when declaring an integer variable, the designations were to be used, such as:


short int a = 0;  // A 16-bit integer
int b = 0;  // A 32-bit integer
long int c = 0;  // Another, 32-bit integer



But, since those ancient days, many developments have come to computers, that include 64-bit CPUs. And so the way the plain-looking declarations now work, is:


short int a = 0;  // A 16-bit integer
int b = 0;  // A 32-bit integer
long int c = 0;  // Usually, either a 32-bit or a 64-bit, depending on the CPU.
long long d = 0;  // Almost always, a 64-bit integer



The fact is not so surprising, that even on 32-bit CPUs, modern C++ runtimes will support 64-bit values partially, because support for longer fields, than the CPU registers, can be achieved, using subroutines that treat longer numbers similarly to how in Elementary School, we were taught to perform multiplication, long division, etc., except that where people were once taught how to perform these operations in Base-10 digits, the subroutine can break longer fields into 32-bit words.

In order to avoid any such confusion, the code is sometimes written in C or C++, like so:


uint16_t a = 0;
uint32_t b = 0;
uint64_t c = 0;



The ability to put these variables into the source-code does not pose as much of a problem, as the need which sometimes exists, to state literals, which can be assigned to these variables. Hence, a developer on a 64-bit machine might be tempted to put something like this:


uint64_t c = 1L << 32;



Which literally means, ‘Compute a constant expression, in which a variable of type (long) is left-shifted 32 bits.’ The problem here would be, that if compiled on a 32-bit platform, the literal ‘1L’ just stands for a 32-bit long integer, and usually, some type of compiler warning will ensue, about the fact that the constant expression is being left-shifted, beyond the size of the word in question, which means that the value ‘0’ would result.

If we are to write source-code that can be compiled equally-well on 32-bit and 64-bit machines, we really need to put:


uint64_t c = 1ULL << 32;



So that the literal ‘1ULL’ will start out, as having a compatible word-size. Hence, the following source-code will become plausible, in that at least it will always compile:

#include <cstdlib>
#include <iostream>

using std::cout;
using std::endl;

int main(int argc, char* argv[]) {

long int c = 1234567890UL;

if (sizeof(long int) > 7) {
c = (long int) 1234567890123456ULL;
}

cout << c << endl;

return 0;
}



The problem that needed to be mitigated, was not so much whether the CPU has 32-bit or 64-bit registers at run-time, but rather, that the source-code needs to compile either way.

Dirk

## Some Suggested Code

In This Earlier Posting, I had written at first some observations about Bluetooth-pairing, but then branched out on the subject, of whether a Diffie-Hellman Key Exchange could be easier to compute, if it was somehow simplified into using a 32-bit modulus. Obviously, my assumption was that a 64-bit by 32-bit divide instruction would be cheap on the CPU, while arbitrary-precision integer operations are relatively expensive, and actually cause some observable lag on CPUs which I’ve used.

And so, because I don’t only want to present theory in a form that some people may not be able to visualize, what I did next was to write a C++ program, that actually only uses C, that assumes the user only has a 32-bit CPU, and yet that performs a 64-bit by 64-bit division.

This has now been tested and verified.

One problem in writing this code is the fact that, depending on whether the divisor, which is formatted as a 64-bit field, contains an actual 64-bit, 32-bit, 24-bit, or 16-bit value, a different procedure needs to be selected, and even this fixed-precision format cannot assume that the bits are always positioned in the correct place.

I invite people to look at this sample-code:

http://dirkmittler.homeip.net/text/divide64.cpp

(Update 06/10/2018, 23h30 : )

I needed to correct mistakes which I made in the same piece of code. However, I presently know the code to be correct.

Just to test my premises, I’m going to assume that the following division is to be carried out, erroneously as a simple division, but assuming a word-size of 32 bits:

## Getting Steam to run with proprietary nVidia.

According to this earlier posting, I had switched my Debian / Stretch, Debian 9 -based computer named ‘Plato’ from the open-source ‘Nouveau’ drivers, which are delivered via ‘Mesa’ packages, to the ‘proprietary nVidia drivers’, because the latter offer more power, in several ways.

But then one question which we’d want an answer to, is how to get “Steam” to run. Just from the Linux package manager, the available games are slim picking, and through a Steam membership, we can buy Linux-versions of at least some powerful games, meaning, to pay for with money.

But, when I tried to launch Steam naively, which used to launch, I only got a message-box which said, that Steam could not find the 32-bit version of ‘libGL.so’ – and then Steam died. This temporary result ‘makes sense’, because I had only installed the default, 64-bit libraries, that go with the proprietary packages. Steam is a 32-bit application by default, and I have a multi-arch setup, as a prerequisite.

And so my next project became, to create a 32-bit as well as the existing, 64-bit interface to the rendering system.

The steps that I took assume, that I had previously chosen to install the ‘GLVND’ version of the GLX binaries, and unless the reader has done same, the following recipe will be incorrect. Only, the ‘GLVND’ packages which I initially installed, are not listed in the posting linked to above; they belonged to the suggested packages, which I wrote I had written down on paper, and then added to the command-line, which transformed my graphics system.

When I installed the additional, 32-bit libraries, I did get a disturbing error message, but my box still runs.