[LLVMbugs] [Bug 21299] New: Debugging info being generated for unused typedefs

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21299

            Bug ID: 21299
           Summary: Debugging info being generated for unused typedefs
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sunil_srivastava at playstation.sony.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Following small example generates debug info for _Longlong. It should not.

Added over hundreds of such cases from system include files, this can add
significant bulk to the debug info.

This is a 3.4 to 3.5 regression. Current TOT also generates it.

  typedef long long _Longlong;
  namespace std { using ::_Longlong; } 
  void foo() {}

+ clang35/bin/clang++ -g -S -O2 -I. -o x-35.s x.cpp
+ clang34/bin/clang++ -g -S -O2 -I. -o x-34.s x.cpp
+ wc x-34.s x-35.s
  166   547  6194 x-34.s
  231   830  9456 x-35.s
  397  1377 15650 total
+ grep _Long x-34.s x-35.s
x-35.s:   .asciz     "_Longlong"
x-35.s:   .asciz     "_Longlong"             # External Name

Interestingly, gcc4.8 also generates _Longlong, but I consider that a gcc bug.
Clang 3.4 did not generate _Longlong; that was correct.

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