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, in C++, 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;

Bugs Found

Checked Projects
422
Collected Errors
14 429
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