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UNION Problem when Porting from 3.236 to 3.249

 
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jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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UNION Problem when Porting from 3.236 to 3.249
PostPosted: Thu Jun 07, 2007 9:27 am     Reply with quote
3.249 (using UltraEdit)

I have code that compiles fine in 3.236 on a desktop w/ PCWH. I'm getting ready to travel and will be using my laptop w/ 3.249 & PCH and UltraEdit.

When I try to compile: (the following code I added to the device header)
Code:
// SSPCON1------------------
extern struct {
unsigned SSPM0:1;
unsigned SSPM1:1;
unsigned SSPM2:1;
unsigned SSPM3:1;
unsigned CKP:1;
unsigned SSPEN:1;
unsigned SSPOV:1;
unsigned WCOL:1;
} SSPCON1;
#byte SSPCON1 = 0xFC6
//------------------------


I get a "EXTERNal symbol not found SSPCON1" error and it points to a line number beyond that of the MAIN file. By commenting lines I've figured that it is a problem with the above code in the header.

I'm I missing something that changed between versions?

Any suggestions would be appreciated.

Thanks,

John
Ttelmah
Guest
PostPosted: Thu Jun 07, 2007 9:38 am     Reply with quote
Extern, _does nothing_ on the older compilers. Support for 'extern', is added in the V4 compiler, and 3.249, _started_to get ready for this.
If you read the manual for 3.236, it will say that the 'extern' keyword, is allowed, but does nothing. In 3.249, is didn't work, but the compiler 'understood' the word enough to kow that it implies an external declaration, which has to be loaded. Hence the error message.
get rid of the extern declaration. It is not needed (you are dealing with a structure that is not 'external' to the program), and is causing your problem.

Best Wishes
jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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PostPosted: Thu Jun 07, 2007 9:46 am     Reply with quote
Bingo.

Thanks, I would have never figured that one out!

John
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