GLEW segfault

[Tommy Hughes]

I decided to build hugin from source to get the latest version as ubuntu is still on version 2021. The build succeeded but hugin fails to start with the following error. I understand this is related to wxWidgets being compiled with EGL support, but I don't know how to proceed from here?

(hugin:5957): Gtk-CRITICAL **: 19:36:35.424: gtk_widget_set_size_request: assertion 'height >= -1' failed
/usr/local/share/hugin/data/plugins/woa.py
  CAT:Control Points
  NAM:Warped Overlap Analysis
  fails @api-max
/usr/local/share/hugin/data/plugins/top_five.py
  CAT:Control Points
  NAM:keep 5 CPs per image pair
  fails @api-max
ERROR: 19:36:35.687688 (/home/thomas/src/hugin/hugin.hg/src/hugin1/hugin/GLViewer.cpp:155) SetUpContext(): Error initialising GLEW: Unknown
error.
[1]    5957 segmentation fault (core dumped)  hugin

[Tommy Hughes]

I solved it by building glew 2.2.0 from https://sourceforge.net/projects/glew/ using:

make SYSTEM=linux-egl              
cd lib

sudo cp * /usr/lib/x86_64-linux-gnu

Then rebuild hugin.

[T. Modes]

This is mentioned in INSTALL_cmake file (which seems nobody is reading...):

On Linux wxWidgets 3.1.5 and later is by default compiled with EGL support for the wxGLCanvas class.
In this case you need to activate EGL support explicitly also in GLEW, otherwise there are crashes when
intializing the wxGLCanvas.

For the default branch there is also the following alternative added:

Alternatively you can also use the epoxy library instead of GLEW, which does
the detection at run time. To build with epoxy add -DBUILD_WITH_EPOXY=on to the CMake command line.

[irthoma...@gmail.com]

I read it but didn't know how to activate egl support in glew. I had glew version 2.1, which doesn't mention it. Only glew 2.2.0 has it. 

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[T. Modes]

irthoma...@gmail.com schrieb am Mittwoch, 29. März 2023 um 21:33:57 UTC+2:

I read it but didn't know how to activate egl support in glew. I had glew version 2.1, which doesn't mention it. Only glew 2.2.0 has it. 

glew 2.1 was released in July 2017, glew 2.2 in January 2021.

So nothing really new.

[Tommy Hughes]

Ah, to start with, I was following the hugin build instructions from the website.

The website needs updating to tell people to follow the build instructions in the download. Otherwise, the path you naturally follow is:  Search for hugin > find https://hugin.sourceforge.io/download/

> Compile from Source

> http://wiki.panotools.org/Hugin_Compiling_ubuntu

[T. Modes]

irthoma...@gmail.com schrieb am Donnerstag, 30. März 2023 um 12:13:08 UTC+2:

Ah, to start with, I was following the hugin build instructions from the website.

The website needs updating to tell people to follow the build instructions in the download. Otherwise, the path you naturally follow is:  Search for hugin > find https://hugin.sourceforge.io/download/

> Compile from Source

> http://wiki.panotools.org/Hugin_Compiling_ubuntu

thanks for the hint. I made some changes to make it more obviously that the first source is the INSTALL_cmake file and the links to the panotools wiki instructions are community contributed and may not be up-to-date.

We can't update the instructions for all possible distributions. So updates/corrections/fixes/clarifications by the users/community are always welcomes. This should be straightforward and can be done directly in the panotools wiki by the users.

Thomas