V3509. AUTOSAR. Unions should not be used.

This diagnostic rule is based on the software development guidelines developed by AUTOSAR (AUTomotive Open System ARchitecture).

The analyzer issues the warning when it detects a union declaration.

Incorrect use of unions may cause various problems, such as reading incorrect values or undefined behavior.

For example, undefined behavior occurs when attempting to read from a member other than the one that the latest write operation was performed on.

Here is an example of code triggering this warning:

union U
  unsigned char uch;
  unsigned int ui;
} uni;
uni.uch = 'w';
int ui = uni.ui;

This diagnostic is classified as:

  • AUTOSAR-M9.5.1

Bugs Found

Checked Projects
Collected Errors
14 526
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