Add dummy macros for conditionally defined macros

[lumynou5]

cppcheck reports "unknownMacro" when a conditionally defined macro is used.

This patch adds dummy macros to make code pass the static analytics without other effects. The assignments and increments make cppcheck consider the variables are used to suppress potential reports about uninitialized variables, unused variables, and can-be-constant variables. The pointers with value 1 instead of NULL suppress reports about indirectly getting value of null pointers.

Closes #210.

Change-Id: Ia8db49c0c71ab82d5da10ce389f57ebb69c99051

[jserv]

Thank @lumynou5 for contributing!

[backink]

The anonymous bit field cause the cppcheck (version 2.13.0) to report "Label 'int' is not used. [unusedLabel]" during static analysis.

[lumynou5]

@backink I suspect it's a bug of Cppcheck while it incorrectly recognizes int as a label. It looks similar to ticket #10886, but the latter was fixed 3 years ago. Try updating your Cppcheck.

[backink]

Hi @lumynou5
I solved the problem by upgrading cppcheck to the newest version, but the required version announced in the project instruction is over 1.90. And cppcheck 2.13 is the official release version of Ubuntu 24.04, which is the newest LTS version, that is, compiling cppcheck manually from source code should be added as a prerequisite to the instruction, otherwise all the participants will encounter this issue.
In my opinion, this commit should be fixed to be compatible with the default version that Ubuntu 24.04 provides.
Thanks

[lumynou5]

this commit should be fixed to be compatible with the default version that Ubuntu 24.04 provides.

I think it's not a compatibility issue, but it's indeed better to work with 2.13.0. Other than installing from other repositories or building from source, the only option is trying not to trigger the false positive. Does giving the data member a name help Cppcheck parse it correctly without other errors?

If so, you may open a pull request to change it like

-     for (entry = (void *) 1; sizeof(struct { int : -1; }); ++(entry))
+     for (entry = (void *) 1; sizeof(struct { int i : -1; }); ++(entry))

and probably note the reason of adding the useless name.