No newline at end of file!


$ echo -n -e “t” | gcc -xc -E -

1 “<stdin>”

1 “<built-in>”

1 “<command line>”

1 “<stdin>”

<stdin>:1:2: warning: no newline at end of file



Each instance of a backslash character () immediately
followed by a new-line character is deleted, splicing
physical source lines to form logical source lines.
Only the last backslash on any physical source line
shall be eligible for being part of such a splice. A
source file that is not empty shall end in a new-line
character, which shall not be immediately preceded by
a backslash character before any such splicing takes
C99 Rationale中进一步指出:
A backslash immediately before a newline has long been used to continue string literals, as well as preprocessing command lines. In the interest of easing machine generation of C, and of transporting code to machines with restrictive physical line lengths, the C89 Committee generalized this mechanism to permit any token to be continued by interposing a backslash/newline sequence.