Inconsistent AUTOSAR code generation between MATLAB R2023b Update 9 and Update 10 (temp variable vs direct Rte_Write calls) – need root cause and resolution

We are facing inconsistent AUTOSAR code generation across PCs using MATLAB R2023b.

Scenario:

Model: Switch block with constants (enum values) feeding an RTE port.

Config: Same model, same configuration set, same dictionary, same toolchain (MSVC v15).

PC 1 (R2023b Update 9): Generated code introduces a temporary variable, assigns it in both if/else branches, then calls Rte_Write(temp).

PC 2 (R2023b Update 10): Generated code directly calls Rte_Write() in each branch without using a temp variable.

Problem:

The direct Rte_Write() calls cause build issues in our toolchain. We need deterministic and consistent code generation across PCs, regardless of MATLAB update level.

Request:

1. What is the root cause of this difference between Update 9 and Update 10?

2. Is this change intentional in Embedded Coder/AUTOSAR code generation?

3. How can we configure MATLAB/Embedded Coder to always generate code using a temporary variable before Rte_Write(), ensuring consistent behavior across all PCs and updates?

[Angelo Yeo]

Please reach out to technical support team. TS team has close connection with DEV which can better help you about version update issue.

Contact Support - MATLAB & Simulink

[Steven Lord]

I'm not 100% certain, but Bug Report 3405727 sounds like it might be relevant.