[Omake] Case-insensitive filesystems

[Aleksey Nogin]

On 12.12.2006 13:21, Jason Hickey wrote:

> On Dec 12, 2006, at 1:01 PM, Aleksey Nogin wrote
>>
>> Jason, any ideas how we might fix the find-target-* functions to do 
>> the right thing on case-insensitive filesystems? Should we just add 
>> global variable that defaults to true on OS X and Windows, but can be 
>> overwritten by the user? Or is there some hope of being able to detect 
>> this?
> 
> Actually, I'm not sure why it is happening.  The result of "ocamldep 
> -modules" should be uncapitalized, so if we see a dependency on Foo, we 
> would check if foo.cmi is buildable.

This is my fault - I changed the above to check for both Foo.cmi and 
foo.cmi (recent versions of OCaml support both).

> For case-sensitivity detection, we could
>    - use statfs(2) to check for HFS, but this is unreliable, since HFS 
> can be forced case-sensitive (I believe)

Unfortunately, statfs is a fairly non-standard function - according to 
the man page, "LSB has deprecated the library calls [f]statfs() and 
tells us to use [f]statvfs() instead" and statvfs does not give the fs 
type :-(

>    - test whether, for example, .omakedb and .OMAKEDB are the same file

Might be a good enough approximation, especially if we give the users a 
chance to override...

Another (partial) option would be to replicate the existing ocamldep 
logic - at least for the OCaml dependencies. Unfortunately, the 
ocamldep's logic for "foo" in path "a:b:c" is "the first of a/foo a/Foo 
b/foo b/Foo c/foo c/Foo" so it can not be cleanly implemented via the 
current cache interface :-(

Aleksey