topic Why did "bool” cause compilation errors in Kinetis Microcontrollers

Why did "bool” cause compilation errors

whagiew — Sat, 08 Dec 2018 06:41:04 GMT

hi,

I use "bool" in the s32ds.exe project, but the compiler reports an error. How do I use bool in my project?

Thanks.

Best regards

yang

Re: Why did "bool” cause compilation errors

BlackNight — Mon, 10 Dec 2018 06:25:57 GMT

Hi yang,

'bool' is not a keyword in the C programming language. To use it, make sure you include stdbool.h:

#include <stdbool.h>

in your sources.

I hope this helps,

Erich

Re: Why did "bool” cause compilation errors

bobpaddock — Tue, 11 Dec 2018 14:51:16 GMT

An unanswerable question is why is it 'bool' and not 'bool_t' to match <stdint.h> types?

Inconsistencies like this are annoying.

Re: Why did "bool” cause compilation errors

danielchen — Mon, 17 Dec 2018 02:44:29 GMT

stdbool.h defines bool as a macro because the C standard 7.18

stdint.h defines intN_t as typedefs because the C standard 7.20

You can use one or the other to achieve the same effect, but it's better to use the proper one to your needs, you need to consider the compatibility of the your project.

Regards

Daniel.

Re: Why did "bool” cause compilation errors

bobpaddock — Mon, 17 Dec 2018 12:37:27 GMT

The point is 'bool' is used as a type, it should end with a _t.

The heading of 7.16 clearly states 'bool' is a type:

"7.16 Boolean type and values".

By convention macros in C are upper case then by 7.18 it should

be BOOL, or properly BOOL_T.

We may be looking at different version of the standard as the one I'm looking at has 7.20 as:

7.20 General utilities <stdlib.h>

Re: Why did "bool” cause compilation errors

whagiew — Sat, 26 Jan 2019 04:17:58 GMT

thanks, the problem is solved with your help.