OSL console message missing #40293

New Issue

Dominik · 2014-05-21T12:14:25+02:00

Dominik commented

2014-05-21 12:14:25 +02:00

System Information
Arch Linux

Blender Version
Blender Version 2.70a
Build hash: f93bc76

Short description of error
Functions printf(), error(), warning() does not give any output in system console and blender internal info.
Even after system update, and blender reinstallation.

Exact steps for others to reproduce the error
Declaration of some variable:

int Test = 5;

then print:

printf("%d", Test);

**System Information** Arch Linux **Blender Version** Blender Version 2.70a Build hash: f93bc76 **Short description of error** Functions printf(), error(), warning() does not give any output in system console and blender internal info. Even after system update, and blender reinstallation. **Exact steps for others to reproduce the error** Declaration of some variable: ``` int Test = 5; ``` then print: ``` printf("%d", Test); ```

Dominik commented

2014-05-21 12:14:25 +02:00

Changed status to: 'Open'

Dominik commented

2014-05-21 12:14:25 +02:00

Added subscriber: @grrrl212

Thomas Dinges self-assigned this 2014-05-21 15:03:33 +02:00

Bastien Montagne commented

2014-05-21 15:53:25 +02:00

Added subscriber: @mont29

Thomas Dinges commented

2014-05-27 07:44:53 +02:00

I can confirm this. Tested with this simple .osl shader. test_print.osl

Tested on Windows x64, vc2008.

I can confirm this. Tested with this simple .osl shader. [test_print.osl](https://archive.blender.org/developer/F91473/test_print.osl) Tested on Windows x64, vc2008.

Brecht Van Lommel commented

2014-06-04 20:08:43 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2014-06-04 20:08:43 +02:00

The problem is that the print statement is getting optimized out. The workaround is to run Blender with the environment variable OSL_OPTIONS="optimize=0".

I'm not sure how to best deal with this, we can either advise user to use this environment variable, or add some option in Blender to enable OSL shader debugging which then sets this and perhaps other options useful for debugging.

The problem is that the print statement is getting optimized out. The workaround is to run Blender with the environment variable `OSL_OPTIONS="optimize=0"`. I'm not sure how to best deal with this, we can either advise user to use this environment variable, or add some option in Blender to enable OSL shader debugging which then sets this and perhaps other options useful for debugging.

Sergey Sharybin commented

2014-06-04 20:29:32 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-06-04 20:29:32 +02:00

Sergey Sharybin commented

2014-06-04 20:29:32 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2014-06-04 20:29:32 +02:00

I don't think it's a bug, just likely shader gets optimized out to a constant. If you set OSL_OPTIONS environment variable to "optimize=0" then you'll totally see the prints.

In fact, the same exact issue has been discussed already there https://github.com/imageworks/OpenShadingLanguage/issues/267

@brecht, correct me if i'm wrong, but it's just specific of how OSL optimizes the shaders. It's done for speed, if you want to debug using printfs, you need to disable optimizations.

I don't think it's a bug, just likely shader gets optimized out to a constant. If you set `OSL_OPTIONS` environment variable to "optimize=0" then you'll totally see the prints. In fact, the same exact issue has been discussed already there https://github.com/imageworks/OpenShadingLanguage/issues/267 @brecht, correct me if i'm wrong, but it's just specific of how OSL optimizes the shaders. It's done for speed, if you want to debug using printfs, you need to disable optimizations.

Prasanth G commented

2018-12-01 10:15:02 +01:00

Added subscriber: @gp

Prasanth G commented

2018-12-01 10:15:03 +01:00

I've just tested this in latest blender versions 2.79 and 2.80 on macOS and can confirm the prints don't work, with OSL_OPTIONS environment variable set to "optimize=0".

Sergey Sharybin commented

2018-12-03 09:50:26 +01:00

@gp, Works with the demo shader on Linux. Could be something platform specific or specific to your setup.

Please make a new report, giving all the details, including simple .blend file which demonstrates the issue.

@gp, Works with the demo shader on Linux. Could be something platform specific or specific to your setup. Please make a new report, giving all the details, including simple .blend file which demonstrates the issue.

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OSL console message missing #40293