[LLVMbugs] [Bug 18265] New: Please add support for Wunused-local-typedefs/Wno-unused-local-typedefs

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18265

            Bug ID: 18265
           Summary: Please add support for
                    Wunused-local-typedefs/Wno-unused-local-typedefs
           Product: new-bugs
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: austinenglish at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Supported by gcc, but not supported by clang. More info:
New warnings for unused local typedefs

The behavior of -Wall has changed and now includes the new warning flag
-Wunused-local-typedefs. This may result in new warnings in code that compiled
cleanly with previous versions of GCC.

For example,

template<typename _Tp>
  int
  foo(_Tp __a)
  {
    typedef int return_type;
    return 5;
  }

int i = foo(415);

Gives the following diagnostic:

warning: typedef ‘return_type’ locally defined but not used
[-Wunused-local-typedefs]
     typedef int return_type;
                 ^

Although these warnings will not result in compilation failure, often -Wall is
used in conjunction with -Werror and as a result, new warnings are turned into
new errors.

To fix, simply remove the unused typedef.

As a workaround, use -Wno-unused-local-typedefs. 

from:
http://gcc.gnu.org/gcc-4.8/porting_to.html

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