Unable to build on Linux

[wsherman64]

I meant to make a formal submission, but just ran out of time. There are some issues with building the tutorial on Linux, and even more troublesome issues with running it -- at least for me. My apologizes for bunching this all in one issue, but it does all have to do with getting Chapter 2 to build and run on Linux.

First some issues with header files:

• For starters, I think it's cleaner to include the standard C++ headers in the source file that requires them rather than all bunched into HelperFunctions.h, so I'd move that block to "main.cpp".
• That said, there is actually a missing include of that does need to go in "HelperFunctions.h" for the use of "stdcmp()" -- I guess the MS-Windows compiler must be more lenient.
• Also in "HelperFunctions.h", there is no need to include .
• The final issue with includes is that "main.cpp" also needs to include for the declaration of "unique_ptr".

The only other issue with compiling is:

• The type "DebugOutput" is not declared anywhere in the Linux build, so I removed the line at the top of the "OpenXRTutorial_Main()" function. After that the build completed.

Unfortunately, when I then run "./OpenXRTutorialChapter2" it outputs the title of the tutorial, and then crashes on the line: const std::vector &supportSwapchainFormats = GetSupportedSwapchainFormats(); I'm not sure whether this is the cause of the error, but in gdb, I was given this information: (gdb) print supportSwapchainFormats $4 = std::vector of length -525420, capacity -525420 = {6620760227972, 962689011016, -8895937474100832024, -5437172960282474460, -4068641623515267036, -4519086758524671672, 6826918609914, -18360, [,,,]

A negative vector length seems like it could be a problem, but I don't know whether this is a cause or a symptom.

I tried a few more experiments:

• Changing the example version from 2.3 to 2.1:

  define XR_DOCS_CHAPTER_VERSION XR_DOCS_CHAPTER_2_1

• and I tried forcing a graphics API setting -- which worked on the version from 07/25/23:

  define XR_USE_GRAPHICS_API_OPENGL

  (also tried "VULKAN")

And one final thought -- last week I was able to get version Chapter 2.1 to build and run, and connect to the Monado OpenXR runtime, so that's a slight regression, but I'm happen to take a step back if it ultimately means we get where we want.

[rvkennedy]

Thanks for the detailed feedback. We'll be revisiting the Linux build later in the week to address this.

[wsherman64]

Great, thanks Roderick. I'll be on the road at SIGGRAPH next week, but I can certainly test whether the application builds, and at least get as far as running the app to see whether it crashes or not while away from my system.

[rvkennedy]

Hi @wsherman64 we've got the Linux version working. It's been tested for Chapters 4 and 5 on OpenGL and Vulkan with Monado (no hardware yet, just emulation). If you've time to take a look, please let me know how you get on.