Unable to find files if a source code folder starts with '@' symbol

[andyg1001]

Describe the bug
If the source code file is within a folder that starts with the @ symbol then CodeChecker is not able to find the file during analysis.

CodeChecker version
6.26.1 (2025-07-14T22:10)

To Reproduce
Steps to reproduce the behaviour:

1. From the command line, create a folder for a simple project and enter it
2. Create a subfolder named @folder
3. Create a file called @folder/main.cpp with the contents:
   int main() { return 0; }
4. Create a top-level Makefile with the contents:

default:
    clang -o app @folder/main.cpp

7. Run CodeChecker log --build make --output compile_commands.json
8. Run CodeChecker analyze compile_commands.json --enable sensitive --output reports

This produces the error "Response file '.../folder/main.cpp' does not exist".

Expected behaviour

It should be able to find the file in '.../@folder/main.cpp'. Note that the compile_commands.json file does correctly identify the path of the file. It is the 'analyze' command that for some reason drops it from the path.