profile analysis result with file are "???".

The installer is qtcreator-linux-x86-opensource-2.2.81-201105110108-setup.bin

Reproduction steps:
1. Create a Qt GUI application.
2. Select Desktop target and Release Mode for the project.
3. Click "Analyze" button on the left bar.
4. Select "Profile" in the Analyzer selector. See select.png.
5. Start analyzing by push the button surrounded by the red rectangle in
select.png.
6. Click "Dump" button on the analyzer bar. See main.png.
7. Search the main function in the area surrounded by red rectangle. See
main.png.
8. main function is at the last line in main.png.
9. Move the mouse over the main item. There is a black rectangle show
the info. The File is always "???".See profile.png.

Expect result:
The main function is in main.cpp. So the file should show main.cpp.

Actual result:
The file show "???".