Created attachment 119919 [details]
Simple test program showing a shader compilation error

The shaders generated seem to be a source of the trouble. The compiler dislikes
the following part of the shader:

int bits = ...;
const uint mask = 0xFFFFFFFFu >> (32 - bits);

It complains:
"error: initializer of const variable `mask' must be a constant expression"

Attached is a simple test program to check for this error. Compile and link
using "g++ const_init.cpp -lGL -lSDL2 -lGLEW"