[WinAVR-users] [ winavr-Bugs-1027555 ] preprocessor's bug ?

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Bugs item #1027555, was opened at 2004-09-13 16:03
Message generated for change (Comment added) made by arcanum
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=520074&aid=1027555&group_id=68108

Category: None
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
>Assigned to: Eric Weddington (arcanum)
Summary: preprocessor's bug ? 

Initial Comment:
At the following: 

.
.
#define vMotDivStage2 40;
.
.
SIGNAL(SIG_OVERFLOW1) {
static uint8_t PreDiv = 0;
.
.
.
  PreDiv = -1 + vMotDivStage2;
  
At above approach all is ok (39 is assigned to PreDiv)
 but if the last lines is like this:

  PreDiv = vMotDivStage2-1;
  
  value of 40 is assigned to PreDiv. 
  

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>Comment By: Eric Weddington (arcanum)
Date: 2004-09-14 16:12

Message:
Logged In: YES 
user_id=543419

Do NOT add a semicolon after a #define statement defining a
value:

#define vMotDivStage2 40;

This causes the statement:
 PreDiv = vMotDivStage2-1;

To be preprocessed into:
 PreDiv = 40;-1;

which of course assigns 40 to PreDiv as expected.


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=520074&aid=1027555&group_id=68108