glspv.frag
ERROR: 0:4: '#error' : GL_SPIRV is set ( correct , not an error )  
ERROR: 0:6: '#error' : GL_SPIR is 100  
ERROR: 0:14: 'input_attachment_index' : only allowed when using GLSL for Vulkan 
ERROR: 0:14: '' :  syntax error
ERROR: 4 compilation errors.  No code generated.


Linked fragment stage:


SPIR-V is not generated for failed compile or link