How to get C/C++ module information with libclang - c++

Question

I am trying to use the module functionalities from libclang. Here is the context:
I have a clang module defined and a source file that call it:
module.modulemap
module test {
requires cplusplus
header "test.h"
}
test.h :
#pragma once
static inline int foo() { return 1; }
test.cpp :
// Try the following command:
// clang++ -fmodules -fcxx-modules -fmodules-cache-path=./cache_path -c test.cpp
// If you see stuff in the ./cache_path directory, then it works!
#include "test.h"
int main(int, char **) {
return foo();
}
cache_path is at first empty then after the command I can see stuff in it so this is working.
My problem is when I try to use libclang to parse the test.cpp file in order to get informations about module:
#include <stdio.h>
#include "clang-c/Index.h"
/*
compile with:
clang -lclang -o module_parser module_parser.c
*/
static enum CXChildVisitResult
visitor(CXCursor cursor, CXCursor parent, CXClientData data)
{
CXSourceLocation loc;
CXFile file;
CXString module_import;
CXModule module;
CXString module_name;
CXString module_full_name;
unsigned line;
unsigned column;
unsigned offset;
if (clang_getCursorKind(cursor) == CXCursor_ModuleImportDecl)
{
loc = clang_getCursorLocation(cursor);
clang_getSpellingLocation(loc,
&file,
&line,
&column,
&offset);
module_import = clang_getCursorSpelling(cursor);
printf("Module import dec at line: %d \"%s\"\n", line, clang_getCString(module_import));
clang_disposeString(module_import);
}
module = clang_Cursor_getModule(cursor);
module_name = clang_Module_getName(module);
module_full_name = clang_Module_getFullName(module);
printf("Module name %s , full name %s\n", clang_getCString(module_name),
clang_getCString(module_full_name));
clang_disposeString(module_name);
clang_disposeString(module_full_name);
return CXChildVisit_Recurse; // visit complete AST recursivly
}
int main(int argc, char *argv[]) {
CXIndex Index = clang_createIndex(0, 1);
const char *args[] = { "-x",
"c++",
"-fmodules",
"-fcxxmodules"//,
"-fmodules-cache-path",
"cache_path"
};
CXTranslationUnit TU = clang_createTranslationUnitFromSourceFile(Index,
"test.cpp",
6,
args,
0,
0);
clang_visitChildren(clang_getTranslationUnitCursor(TU), visitor, 0);
clang_disposeTranslationUnit(TU);
clang_disposeIndex(Index);
return 0;
}
The output of this code is :
...
Module name , full name
Module name , full name
Module name , full name
Module name , full name
Module name , full name
...
First it seems that clang doesn't detect any cursor of the kind CXCursor_ModuleImportDecl and then at any momment it find a valid module.
What am I doing wrong?