[cfe-dev] Simple c++ sample not building with clang++

[Douglas Gregor]

On Aug 23, 2010, at 4:00 AM, Romain Pechayre wrote:

> Hello, please consider the following simple c++ code:
> % cat Main.cc
> //first alias 
> namespace original_namespace {}  // decl 1
> namespace client_namespace {
>   namespace alias_ns = original_namespace;
> }
> 
> //second alias
> namespace original_namespace {} //decl 2
> namespace client_namespace {
>   namespace alias_ns = original_namespace;
> }
> 
> This does not build with clang++ and does build with g++
> . I get the following diagnosis:
> Main.cc:16:11: error: redefinition of 'alias_ns' as different kind of symbol
> 
> namespace alias_ns = original_namespace;
>                   ^
> Main.cc:16:1: note: previous definition was here:
> namespace alias_ns = original_namespace;
> ^
> 
> Of course this is a silly example, but I came across this when some similar code was included again and again from different source files. I have put this into a simple single file to see if I was still getting the problem, and yes.
> 
> Even more surprising is when you comment  decl2 of namespace original_namespace, no error ! I cannot understand why. Then I thought that maybe clang was mispointing the error that was in the second declaration of original_namespace. It is not the case, as only commenting the second alias instruction and keeping decl1 works.
> 
> I am using clang and llvm 2.7 (not svn)

That was a bug in Clang 2.7, which has already been fixed on mainline. In general, you should not use Clang 2.7 for C++ code. Top-of-tree in Subversion is far, far better at handling C++.

	- Doug

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