[CMake] SWIG syntax errors

[Adam A Smith]

I'm curious if someone has run into this before:

I'm using CMake to make some SWIG .i files.  I then use SWIG on those 
files, and it tells me that I have a syntax error.  (I don't know SWIG 
syntax that well, but I'm learning.)  I thought I'd ask all of you if this 
is something you were familiar with.

Details:

There are several .cpp files in the C++ library I'm trying to translate to 
Perl, Python, etc.  (Doesn't matter what language I specify--the same 
error comes up.)  For example, I might tell it:

$ swig -c++ -perl5 TextTools.cpp.i

and get this error:

TextTools.cpp.i:49: Error: Syntax error in input(1).

The .i file made from each .cpp file differs, of course.  But the syntax 
error is always here:

namespace std __attribute__ ((__visibility__ ("default"))) {
# 245 "/usr/include/c++/4.3/i486-linux-gnu/bits/c++config.h" 3
}

SWIG lists the first line (namespace std ...) as being the one with the 
error.  (So in my above example, that's line 49.)

Does anybody have an idea?

Thanks,
Adam