gl_Position Not Working in a Loop

It seems that gl_Position doesn’t let the shader link when inside a loop that uses a uniform variable as a end condition.

[NOTE]int current_level = 0;
uniform int lod_level = 1;
while(current_level < lod_level)
gl_Position = pos;

This isn’t all the code, but commenting out gl_positon or changing the while loop to;

[NOTE]while(current_level < 2)[/NOTE]

will then work

Hope someone can shed some light on this. Thanks.

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