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, unexpected IDENTIFIER, expecting LEFT_BRACE or COMMA or SEMICOLON
ERROR: 4 compilation errors.  No code generated.


SPIR-V is not generated for failed compile or link