[LLVMbugs] [Bug 22973] New: Different __LINE__ for different lines during macro expansion

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=22973

            Bug ID: 22973
           Summary: Different __LINE__ for different lines during macro
                    expansion
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: a3at.mail at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Using the following simple example you can see that gcc shows 13:13, while
clang 12:13.
Is clang behavior correct?
Thanks!

$ cat test.c
#include <stdio.h>

#define stringify(x) #x
#define tostring(x) stringify(x)

#define outer(a, b) { a; b; }
#define inner() { puts(tostring(__LINE__)); }

int main()
{
        outer(
                inner()
        , inner());
        return 0;
}

$ gcc --version; gcc test.c && ./a.out                                          
gcc (Debian 4.9.2-10) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

13
13

$ clang --version; clang /tmp/test.c && ./a.out
clang version 3.7.0 (http://llvm.org/git/clang.git
5447bd5deba61e1d4a647542c066e0a14e3ec5d7) (http://llvm.org/git/llvm.git
1f229009ed1bac72844587d24d031929175330dd)
Target: x86_64-unknown-linux-gnu
Thread model: posix
12
13

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