Defect Report #173
Submission Date: 16 Oct 95
Source: Clive D.W. Feather
Submitted to BSI by Clive D.W. Feather firstname.lastname@example.org .
In this Defect Report, identifiers lexically identical to those
declared in standard headers refer to the identifiers declared in those
standard headers, whether or not the header is explicitly mentioned.
This Defect Report has been prepared with considerable help from
Mark Brader, Jutta Degener, Ronald Guilmette, and a person whose
employment conditions require anonymity. However, except where stated,
opinions expressed or implied should not be assumed to be those of any
person other than myself.
Defect Report UK 021: Line numbers
The concept of line number is not clearly defined when a
token is split over more than one physical source line.
Subclause 6.8.4 reads in part:
The line number of the current source line is one greater than
the number of new-line characters read or introduced in translation
phase 1 (188.8.131.52) while processing the source file to the current
Subclause 6.8.8 reads in part:
__LINE__ - The line number of the current source line
(a decimal constant).
Consider the program:
#define LNER __LINE__
/* The next statement is on physical source lines 6 to 8 */
int east_coast = __\
/* The next statement is
on physical source lines 10 to 13 */
int main_line = L\
int main (void)
printf ("%d %d\n", east_coast,
In each of the two substitutions, it is unclear whether the
line number is the number of new-lines read to the start of the
current token, or to the end of the current token, or to a
specified point within the current token.
What is the output of this program?
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