[cfe-users] clang_createTranslationUnitFromSourceFile() and C++ source code

[Kirill Bugaev via cfe-users]

I am trying to determine data types in C++ source code with help of
libclang. My program is
=====
#include <stdio.h>
#include <stdlib.h>
#include <clang-c/Index.h>

int main(int argc, char *argv[])
{
    CXIndex index;
    CXTranslationUnit tu;
    CXFile file;
    CXSourceLocation loc;
    CXCursor cursor, def;
    CXType type;
    CXString typesp;
    const char *types;

    char const *args[2] = {"-x", "c++"};
    index = clang_createIndex(0, 0);
    tu = clang_createTranslationUnitFromSourceFile(index, argv[1],
            2, args, 0, NULL);
    file = clang_getFile(tu, argv[1]);
    loc = clang_getLocation(tu, file, atoi(argv[2]), atoi(argv[3]));
    cursor = clang_getCursor(tu, loc);

    if (clang_isPreprocessing(cursor.kind))
        printf("Preprocessor\n");
    else {
        def = clang_getCursorDefinition(cursor);
        if (clang_Cursor_isNull(def))
            type = clang_getCursorType(cursor);
        else
            type = clang_getCursorType(def);
        typesp = clang_getTypeSpelling(type);
        types = clang_getCString(typesp);
        printf("%s\n", types);
        clang_disposeString(typesp);
    }
    clang_disposeTranslationUnit(tu);
    clang_disposeIndex(index);
}
=====

And test source code helloworld.cpp which I feed to my program
=====
#include <iostream>

int main()
{
    long t;
    t = 0;
    std::cout << "Hello World!";
}
=====

When I pass test source code to program into command line arguments, like
./program helloworld.cpp 7 2, it can't determine type of variable t. I
watched value of cursor variable with gdb, it is {kind =
CXCursor_NoDeclFound, xdata = 0, data = {0x0, 0x0, 0x0}}. But everything
works fine if I generate AST file for helloworld.cpp and use
clang_createTranslationUnit() instead of
clang_createTranslationUnitFromSourceFile().

I do something wrong or clang_createTranslationUnitFromSourceFile() doesn't
support parsing of C++ code? My clang version is 8.0.0
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