[llvm-dev] [Path] RFC: Known directories

[Paweł Bylica via llvm-dev]

Hi,

llvm::sys::path allows the user to query "known directory" paths: temp,
cache, home. I was tweaking this area a bit for some time. I would like to
propose a small redesign.

What we have so far?

home_directory() tries to return what it promises. No issues with that.

system_temp_directory(true) returns a path to a directory that can be
erased on reboot. On Linux it is usually /tmp. On Windows and OSX it
returns user's temp directories as a first choice.

system_temp_directory(false) returns a path to a directory that is not
cleared on reboot. On Linux it is usually /var/tmp. On Windows is the same
as system_temp_directory(true). On OSX it is user's cache directory.

user_cache_directory() returns a path to user's cache directory.

Redesign proposal:

   1. Add function temp_directory() - a replacement for
   system_temp_directory(true). If it returns system or user temp directory is
   OS-specific. Same as system_temp_directory() it always succeed.
   2. Implement system_temp_directory(bool) in terms of temp_directory()
   and user_cache_directory().
   3. Deprecate system_temp_directory(bool).

Comments?
- Paweł
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