Changelog for shaderc: 2026.3 -> 2026.4
Source: CHANGES

v2026.4 2026-09-11
 - Use Glslang 16.6.0, SPIRV-Tools v2026.4.rc2
 - Incorporate fixes for SPV_KHR_abort abortEXT(...)
 - glslc:
     option -fshader-stage now accepts all shader
     stage names as allowed in #pragma shader_stage(<stage>)>
     This includes ray tracing, task, and mesh shader
     stages.
 - Fixes an assert