[LLVMbugs] [Bug 18564] New: Redefinition of identical typedefs fails

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18564

            Bug ID: 18564
           Summary: Redefinition of identical typedefs fails
           Product: clang
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: fluffmail at f-m.fm
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

>From C11 §6.7(3): "a typedef name may be redefined to denote the same type as
it currently does, provided that type is not a variably modified type."

So we should be able to redundantly duplicate the same typedef into a file with
no problem. But clang seems to have trouble identifying that duplicated
typedefs are duplicates. Sample code:

-------------
typedef struct {
    int a;
    double b;
} ab;

typedef struct {
    int a;
    double b;
} ab;

int main(){}

------------

Result:

> clang --std=c11 bug.c

bug.c:9:3: error: typedef redefinition with different types ('struct ab' vs
'struct ab')
} ab;
  ^
bug.c:4:3: note: previous definition is here
} ab;
  ^
1 error generated.

------------

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