[osg-users] Correct place to check shader compile errors

['James Turner' via OpenSceneGraph Users]

I’m trying to extract shader compile and link info logs at runtime, so I 
can log+report them.

I note osg::Program::getGlProgramInfoLog exists, obviously it takes a 
context ID since the PerContextProgram is what has the actual errors.

Two things I need help with:

1) does the program log also contain shader compile errors, or is this only 
the link log? I don’t see a corresponding APi on osg::Shader, is why I ask

2) *when* can I call the log functions and expect to get valid results? 
Given the OSG drawing model, obviously the log won’t be available 
immediately when creating the Program.. Do I need to use a DrawCallback to 
check the log after the first time the Program has been used?

I looked for examples of using getGlProgramInfoLog but unfortunately 
couldn't find any, maybe pointing me at one would answer both of these 
points.

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