[LLVMdev] Parsing C++ headers with Clang bindings for Python

[Elliott Slaughter]

I'd like to parse a C++ header file (say, math.h) with the Clang bindings
for Python. (Yes, I know math.h is technically a C header, but for my
purposes I want to pretend that it is C++.) For some reason, Clang is able
to parse the file as C, but not as C++.

Here is an example session:

>>> import clang.cindex
>>> idx = clang.cindex.Index.create()
>>> tu = idx.parse('/usr/include/math.h', ['-x', 'c++-header'])
>>> c = tu.cursor
>>> for d in c.get_children():
...     print d.kind, d.spelling
...
CursorKind.TYPEDEF_DECL __int128_t
CursorKind.TYPEDEF_DECL __uint128_t
CursorKind.TYPEDEF_DECL __builtin_va_list
CursorKind.UNEXPOSED_DECL
>>> print len(tu.diagnostics)
0

Now that list clearly does not represent the contents of math.h. However,
as you can see, I don't get an error, and the list of diagnostics is empty.

When I use C mode, I instead get the list of functions I'm expecting to see:

>>> tu = idx.parse('/usr/include/math.h', ['-x', 'c-header'])
>>> c = tu.cursor
>>> for d in c.get_children():
...     print d.kind, d.spelling
...
CursorKind.TYPEDEF_DECL __int128_t
CursorKind.TYPEDEF_DECL __uint128_t
CursorKind.TYPEDEF_DECL __builtin_va_list
[...]
CursorKind.FUNCTION_DECL acosf
CursorKind.FUNCTION_DECL acos
CursorKind.FUNCTION_DECL acosl
[...]

Am I doing something obviously wrong (aside from calling math.h a C++
header)? Is there any reasonable way to debug problems like this?

I'm on Mac OS X 10.8 using the Clang binaries from Xcode (Apple LLVM
version 5.0 (clang-500.2.75) (based on LLVM 3.3svn)), and Python bindings
from Clang 3.2, and Python 2.7.2. (I am unable to test 3.3 because
clang_Cursor_isBitField seems to be missing.)

Thanks.

-- 
Elliott Slaughter

"Don't worry about what anybody else is going to do. The best way to
predict the future is to invent it." - Alan Kay
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