glslang should report a link error if none of the computer shaders contain a fixed work group size

[chuxin12345]

glslang should report a link error if none of the computer shaders contain a fixed work group size. From GLSLangSpec.4.60, glslang chapter 4.4.1 and page 76. "Furthermore, if a program object contains any compute shaders, at least one must contain an input layout qualifier specifying a fixed workgroup size for the program, or a link-time error will occur."

below is the test case which link success, thx~

eg. comp shader 0

#version 430 core void Run(); void main() { Run(); }

eg. comp shader 1

#version 430 core layout(std430) buffer Output { uint g_output[]; }; void Run() { g_output[gl_GlobalInvocationID.x] = 0; }

cmd: glslangValidator.exe debug0.comp debug1.comp -l -i