Loading Static Analyzer plugin fails with CommandLine Errors

I’m using Clang 3.3. I have a Clang Static Analyzer plugin that contains the following symbols:

extern “C” const char clang_analyzerAPIVersionString = CLANG_ANALYZER_API_VERSION_STRING;

extern “C” void clang_registerCheckers(clang::ento::CheckerRegistry& registry)

However, when I try to do something with it, like:

clang++ -c test.cpp -Xclang -load -Xclang plugin.so

I get the following output:

: CommandLine Error: Argument ‘view-background’ defined more than once!

: CommandLine Error: Argument ‘debug-only’ defined more than once!

: CommandLine Error: Argument ‘debug-buffer-size’ defined more than once!

: CommandLine Error: Argument ‘debug’ defined more than once!

: CommandLine Error: Argument ‘version’ defined more than once!

: CommandLine Error: Argument ‘print-all-options’ defined more than once!

: CommandLine Error: Argument ‘print-options’ defined more than once!

: CommandLine Error: Argument ‘help-hidden’ defined more than once!

: CommandLine Error: Argument ‘help’ defined more than once!

: CommandLine Error: Argument ‘help-list-hidden’ defined more than once!

: CommandLine Error: Argument ‘help-list’ defined more than once!

clang: CommandLine Error: Argument ‘view-background’ defined more than once!

clang: CommandLine Error: Argument ‘debug-only’ defined more than once!

clang: CommandLine Error: Argument ‘debug-buffer-size’ defined more than once!

clang: CommandLine Error: Argument ‘debug’ defined more than once!

clang: CommandLine Error: Argument ‘version’ defined more than once!

clang: CommandLine Error: Argument ‘print-all-options’ defined more than once!

clang: CommandLine Error: Argument ‘print-options’ defined more than once!

clang: CommandLine Error: Argument ‘help-hidden’ defined more than once!

clang: CommandLine Error: Argument ‘help’ defined more than once!

clang: CommandLine Error: Argument ‘help-list-hidden’ defined more than once!

clang: CommandLine Error: Argument ‘help-list’ defined more than once!

I have never encountered such an error before, and this works perfectly on a different machine, although with 32-bit binaries (it being a 32-bit system inside a VirtualBox).

The plugin was compiled using Clang 3.3, as a shared library, with -fPIC and -fno-rtti. ‘file plugin.so’ output:

ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, not stripped

‘file clang’ output:

ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0xb08840ba88f98740a0e3f4b6448e1c4b70ad57ce, not stripped

Clang (again, version 3.3) was configured with --enable-optimized, and was built using GCC 4.7.2.

Any idea what could be the issue here?

Thanks!