Comment with multiline symbol and code generation

If you have a comment which happens to end with a multiline symbol '\', the code for the subsequent statement is not generated. I'm not a gcc expert but it seems odd that this would happen.

Compiler: Crossworks for ARM
Version: 2.0.4.2009110400.6059

Code Sample (also attached):
// Multiline bug test code

#include <cross_studio_io.h>

int main()
{
volatile int viFoo;

viFoo =  1;

debug_printf("ViFoo = %d\n", viFoo);

viFoo =  2;
debug_printf("ViFoo = %d\n", viFoo);

viFoo =  1 +\
    2 +\
    3;

debug_printf("ViFoo = %d\n", viFoo);

// viFoo =  1 +\
viFoo =  2 +\
    2 +\
    3;

debug_printf("ViFoo = %d\n", viFoo);

return(0);
}

Output:
ViFoo = 1
ViFoo = 2
ViFoo = 6
ViFoo = 6

I expected the last statement to be a 7. I looked at the test.elf file and no code was generated for the statement following: // viFoo = 1 +\

/attachments/token/0b1spe716v0iguu

Brian Myers

February 11, 2010 18:32

That's normal. "//" means "this is a comment, until the end of the line". "\" means "this line does not end here, it continues. Thus, the following line is a part of the comment. That's *exactly* what's supposed to happen. If your editor does colour-context, it should show the second line as comment-coloured.

Paul Curtis

February 11, 2010 22:19

Indeed, it is exactly as designed. No code bug, but certainly user bug. And probably syntax coloring bug in CrossStudio.

February 11, 2010 22:27

Just checked it, and looks like you are correct Paul, appears to be a syntax colouring bug in CrossStudio (I do most of my code-editing in an external editor).

Comment with multiline symbol and code generation

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