[LLVMbugs] [Bug 12841] New: Invalid Name Redefinition Error

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12841

             Bug #: 12841
           Summary: Invalid Name Redefinition Error
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: turbobafalcon at hotmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


This is using the most up-to-date build for OpenSUSE 12.1 on x86-64 (clang
version 3.0 (branches/release_30 145598)).

Example code producing the error is provided below. The code compiles correctly
on GCC 4.6. I expect that the bool varName variable declared in the if
statement should be available to all sub-blocks but should not prevent them
from declaring another variable with the same name (however poor that may be in
terms of coding style).

The error that I get is the following:
test.cpp:7:13: error: redefinition of 'varName' with a different type
                const int varName = 0;
                          ^
test.cpp:5:11: note: previous definition is here                                
        if (bool varName = (a_argc == 1))
                 ^
test.cpp:16:13: error: redefinition of 'varName' with a different type          
                const int varName = 1;
                          ^
test.cpp:5:11: note: previous definition is here                                
        if (bool varName = (a_argc == 1))
                 ^
2 errors generated.

I wouldn't be surprised if this has already been fixed, but I couldn't find a
duplicate report.

>>>>>>>>>>>>>>>>>>>Contents of test.cpp<<<<<<<<<<<<<<<<<<<<<<<<<

#include <iostream>

int main(int a_argc, char * a_argv[])
{
    if (bool varName = (a_argc == 1))
    {
        const int varName = 0;//GENERATES ERROR
        std::cout << "branch a" << std::endl;
    }
    //Uncommenting this will fix the problem in the block below,
    //same as if you surround it with an extra set of braces.
    //else if (false)
    //{
    //}
    else
    {
        const int varName = 1;//GENERATES ERROR
        std::cout << "branch b" << std::endl;
    }
}

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