a bug with the structure that contains bit fields?

using CVI 8.5. I tried to set up a structure that contains bit fields. Although the structure compiles, I encounter strange behavior when you access individual fields, while the value of the overall structure seems ok. Here is the structure:

typedef struct
{
Union
{
struct
{
unsigned int Flag1: 1;
unsigned int dummy: 3;
unsigned int Flag2: 4;
unsigned int Indicateur3: 4;
unsigned int dummy2: 4;
};
unsigned short;
} flags;
} flagset;

When you set the Member 'all' to a value so that one or more indicators, but not all, are false, I still read the individual like real flags, until all flags are set to false.

I missed something? This definition is really legal?

Please find attached a file showing the problem.

The same issue is at stake with or without the ternary operator. It turns out the problem was not specifically with printf, but rather a bug in the compiler that is related to the evaluation of the members of anonymous internal structures. If several internal anonymous struct members are evaluated before the compiler actually do anything with the result - which is the case when passing arguments to a function-, so they will all be evaluates the value that was evaluated last.

A. Mert

National Instruments

Tags: NI Software

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