Error: unable to open input file: spv.140.vert
Usage: glslangValidator [option]... [file]...

Where: each 'file' ends in .<stage>, where <stage> is one of
    .conf to provide an optional config file that replaces the default configuration
          (see -c option below for generating a template)
    .vert for a vertex shader
    .tesc for a tessellation control shader
    .tese for a tessellation evaluation shader
    .geom for a geometry shader
    .frag for a fragment shader
    .comp for a compute shader

Compilation warnings and errors will be printed to stdout.

To get other information, use one of the following options:
(Each option must be specified separately, but can go anywhere in the command line.)
  -V  create SPIR-V in file <stage>.spv
  -H  print human readable form of SPIR-V; turns on -V
  -E  print pre-processed glsl. Cannot be used with -V, -H or -l.
  -c  configuration dump; use to create default configuration file (redirect to a .conf file)
  -d  default to desktop (#version 110) when there is no version in the shader (default is ES version 100)
  -i  intermediate tree (glslang AST) is printed out
  -l  link validation of all input files
  -m  memory leak mode
  -q  dump reflection query database
  -r  relaxed semantic error-checking mode
  -s  silent mode
  -t  multi-threaded mode
  -v  print version strings
  -w  suppress warnings (except as required by #extension : warn)