In function `make_relative_path` (file `ccache.c`), the given path is made "canonic" before it is converted to a path relative to the current working directory. In particular, "canonic" means that symbolic links are removed. I understand that it makes sense to make the current working directory canonic, but I do not see why this done for the path given to `make_relative_path`. Is it really necessary?
The reason why I am asking is that I have a usage scenario where this reduces sharing a cache among different users. Much simplified, assume that we have a source code repository that manages a couple of directories. Individual users only check out the directories they work on. For directories they do not work on, but are required to build the sources they work on, they create a symbolic link to a reference area in which only stuff required for building resides. During compilation, the working directory is always one of the source code directories. For example, assume user1 is working in directory `lib` and `src`, and user2 is working in `src` only. Then the setup will look like this: /reference/ lib/ lib.h /user1/ lib/ lib.h lib.c src/ test.c /user1/ lib -> /reference/lib src/ test.c Now, assume user1 sets `base_dir` to `/user1` and user2 sets `base_dir` to `/user2`. The working directories when compiling `test.c` are `/user1/src` and `/user2/src`, respectively. The paths to the lib directory are `/user1/lib` and `/user2/lib`. However, the latter canonically becomes `/reference/lib`. Therefore, the relative paths become `../lib` and `../../referece/lib`, respectively. As the relative paths are not equal, the cache cannot be shared, even if the `lib.h` and `test.c` files are identical. With the original paths (not resolving the symbolic links), the relative paths to lib would be `../lib` in either case, and the cache could be shared. Regards, Andreas _______________________________________________ ccache mailing list firstname.lastname@example.org https://lists.samba.org/mailman/listinfo/ccache