RTEMS | Warnings in cpukit dev/can (#5388)

[Joel Sherrill (@joel)]

Joel Sherrill commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5388#note_137316


Looks like the GCC documentation is wrong or you looked at the likely older documentation that came with your native GCC.

The left hand side (LHS) has a range of 0..255 which clearly cannot exceed the upper limit of a 32 bit value. 

C supports letters at the end to make the constant unsigned or a larger type but nothing to shrink the type.

Most of the Wtype-limits warnings were for comparing an unsigned variable to be < 0 which cannot happen.

I would change the macro to add a cast to uint8_t. Something like "((uint8_t) Number)".

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5388#note_137316
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