http://llvm.org/bugs/show_bug.cgi?id=9162
Summary: Namespace and extern "C" gives problems with forward
struct declarations
Product: clang
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Clang has a problem compiling the gstreamer backend for KDE's phonon
library. I encountered this issue with trunk r125004. The reduced C++
code goes like this:
namespace Gstreamer {
extern "C" {
typedef struct _ArtsSink ArtsSink;
struct _ArtsSink {
int sink;
};
}
int arts_sink_get_type()
{
return sizeof(ArtsSink);
}
}
Compiling this with clang++ gives:
fwddecl.cpp:10:12: error: invalid application of 'sizeof' to an incomplete type
'ArtsSink' (aka 'Gstreamer::_ArtsSink')
return sizeof(ArtsSink);
^ ~~~~~~~~~~
fwddecl.cpp:3:20: note: forward declaration of 'Gstreamer::_ArtsSink'
typedef struct _ArtsSink ArtsSink;
^
1 error generated.
Granted, it is a bit weird how the KDE guys forward declare the
_ArtsSink struct, but as far as I can see, it should still compile.
I tried this fragment with g++ 4.2.1 (FreeBSD base system compiler), g++
4.5.3, and Coumeau 4.3.10.1, and they all accept it without any
complaint.
Note: the error goes away when you eliminate either the namespace or the
'extern "C"' block. Both are required to produce the error.
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