Python clang package recognizes std::string_view as int

[OppositeNor]

The pip package clang recognizes the C++ standard library type std::string_view as int.

Reproduce:

#include <string_view>

std::string_view str_view_global;

struct TestStruct {
    std::string_view str_view;
};

import clang.cindex

index = clang.cindex.Index.create()
tu = index.parse(
    "test.cpp",
    options=clang.cindex.TranslationUnit.PARSE_DETAILED_PROCESSING_RECORD
)

if tu is None or tu.cursor is None:
    raise RuntimeError("Failed to parse C++ file.")


for cursor in tu.cursor.get_children():
    if cursor.spelling == "str_view_global":
        print(cursor.type.spelling, cursor.spelling)
    if cursor.kind == clang.cindex.CursorKind.STRUCT_DECL and cursor.spelling == "TestStruct":
        for field in cursor.get_children():
            if field.kind != clang.cindex.CursorKind.FIELD_DECL:
                continue
            print(field.type.spelling, field.spelling)

Output:

❯ python ./test.py
int str_view_global
int str_view

Version info:

❯ pip show clang
Name: clang
Version: 20.1.5
Summary: libclang python bindings
Home-page: http://clang.llvm.org/
Author: LLVM team - pypi upload by Loic Jaquemet
Author-email: 
License: Apache-2.0 with LLVM exception
Location: /home/oppositenormal/miniforge3/envs/white-bird-engine/lib/python3.12/site-packages
Requires: 
Required-by: 

[efriedma-quic]

You should check tu.diagnostics. Normally, unexpected "int" types are a result of error recovery in the parser.

[OppositeNor]

Hi! After I added:

for diag in tu.diagnostics:
    print(diag)

It outputs

/usr/include/wchar.h:35:10: fatal error: 'stddef.h' file not found

Which might be the problem. I'm not sure why it outputs this however since the file compiles perfectly fine with clang.

[efriedma-quic]

I think I've seen cases in the past where you need to explicitly pass -resource-dir. See #64834 #18150.