CodeWarrior for MCU中的主题 Re: Data Structure problem in Code warrior

Data Structure problem in Code warrior

wheelmonitor — Tue, 22 Aug 2006 01:59:54 GMT

Does anyone know if Code Warrior has a problem of declaring data structure within a data structure, In specific i am doing the following and the code warrios is giving me compile error. Anyone has any idea on how to get around the problem:

struct{

int x;

int y;

}DATA;

typedef struct{

int j;

int k;

DATA d;

}STRUCT;

the error i get is "typedef name expected"

Re: Data Structure problem in Code warrior

CompilerGuru — Tue, 22 Aug 2006 03:22:30 GMT

you missed the typedef before the first declaration.
Therefore this defines a global struct DATA, DATA is not a type, it a variable!
Daniel

Re: Data Structure problem in Code warrior

wheelmonitor — Tue, 22 Aug 2006 03:27:15 GMT

sorry that was a typo. i did use typedef in front of both structures.

thanks for the reply

Re: Data Structure problem in Code warrior

CrasyCat — Tue, 22 Aug 2006 16:40:10 GMT

Hello

This should work.

Which processor are you targeting (HC08, HC12, Coldfire, PowerPC, .....)?

Which version of CodeWarrior are you using?
To retrieve version information:
- Start IDE
- Select "Help" -> "About Metrowerks CodeWarrior" or "About Freescale CodeWarrior"
- Press the "Installed Products" button
- You will see the CodeWarrior version number on top of the "Installed product" dialog.

CrasyCat

Re: Data Structure problem in Code warrior

wheelmonitor — Tue, 22 Aug 2006 21:12:53 GMT

i am targetting freescale HC12(MC9S12D64) and the Code warrior version is 3.0 with IDE version number is 5.5.1272.

Could it be something in the compiler options that i need to look at???

thanks for replying

Re: Data Structure problem in Code warrior

CrasyCat — Tue, 22 Aug 2006 21:43:42 GMT

Hello

There should be something in your application.

I have created a project with CodeWarrior HC12 V3.0 and added following code there.

typedef struct{
int x;
int y;
}DATA;

typedef struct{
int j;
int k;
DATA d;
}STRUCT;

STRUCT myStruct;

void main(void) {
/* put your own code here */
EnableInterrupts;
myStruct.j= 9;
for(; {} /* wait forever */
}

I can build that without any problem.

You may have a syntax error right before the type definition for DATA. Anyway I would need to look at the preprocessor output of the file generating the message.

Can you generate that preprocessor listing (just add option -lp to your compiler command line. The compiler will generate a file with extension .pre. That is the file I need).

CrasyCat

Re: Data Structure problem in Code warrior

wheelmonitor — Tue, 22 Aug 2006 22:37:07 GMT

you are not going to beleive what the problem was. if you declare DATA after the structure you are using it in it doesn't compile and gives you all sort of errors but if you declare DATA before u use it in another data structure, it complies with no problem.

Thanks for your help

sincerely,

Re: Data Structure problem in Code warrior

CrasyCat — Wed, 23 Aug 2006 16:47:38 GMT

Hello

This is compliant to ANSI C standard .

If type DATA is not known when STRUCT is defined, the compiler cannot evaluate the size of the type STRUCT. So it complains.

CrasyCat