[Bug preprocessor/27750] New: bogus 'backslash-newline at end of file' warning

[sabre at nondot dot org]

Consider this reduced translation unit:

---
//  foo ??/
x
---

... where there is no newline after the X.  Compiled like so:

$ gcc bug.c -Wall -pedantic -fsyntax-only -trigraphs -std=c99

yields:
bug.c:2:9: warning: trigraph ??/ converted to \
bug.c:2:9: warning: backslash-newline at end of file
bug.c:2:1: warning: multi-line comment
bug.c:1: warning: ISO C forbids an empty source file

A couple of issues.  First, the diagnostics are not sorted.  The last one
should be issued first.  Second, more importantly, the 2nd diagnostic is
incorrect.  There is no backslash-newline at the end of the file.  The first
and third diagnostics are accurate.

Again, note that there should be *no* newline after the x to reproduce this.

-Chris


-- 
           Summary: bogus 'backslash-newline at end of file' warning
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sabre at nondot dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27750