[LLVMbugs] [Bug 19083] New: Weird (likely bugged) error diagnostic when reusing builtin name

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19083

            Bug ID: 19083
           Summary: Weird (likely bugged) error diagnostic when reusing
                    builtin name
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: abramo.bagnara at bugseng.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ cat z.c
int printf;
$ clang -c z.c
z.c:1:5: error: redefinition of 'printf' as different kind of symbol
int printf;
    ^
z.c:1:5: note: previous definition is here
1 error generated.

The message about previous definition is definitely misleading.

That apart I'm not sure that to treat this as a fatal error is the right thing
to do.

FWIW:
$ gcc -c z.c
z.c:1:5: warning: built-in function ‘printf’ declared as non-function [enabled
by default]
 int printf;
     ^

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