Re: Mac OSX vs. VPATH vs. Automake's auto disted files

[Akim Demaille]

Le 23 août 04, à 18:58, Paul D. Smith a écrit :

> %% Akim Demaille <address@hidden> writes:
>
>   ad> I met a problem on Mac OSX, and diagnosed it as follows.  I 
> would not
>   ad> call this a problem in Automake.  Probably GNU Make 3.79 is the 
> most
>   ad> likely culprit, but at least I wanted to describe this issue in 
> case
>   ad> someone else finds it.
>
>   ad> The problem is that
>   ad> - Mac OSX (by default) is case preserving, but case insensitive
>   ad> - Make, when looking for dependencies correctly understands this
>
> This is not true.  Unless you are setting some special flags in the
> build of GNU make (please let me know what they are if so) GNU make
> always assumes normal UNIX filesystem semantics: that is, 
> case-sensitive
> and case-preserving.

Any means to get the flags from make itself?  I don't know how
Apple built it: that's stock Make.

> What is probably happening here is that make is looking up the filename
> and the underlying operating system sees that it does exist (because
> it's case-insensitive).
>
> But make does not understand this.
>
>   ad> - but Make no longer understands this properly when meeting
>   ad>   dependencies requires walking the VPATH and when the case is
>   ad>   not exactly the same.
>
> In this case what's probably happening is that VPATH is causing make to
> read the directory structure into its directory cache, and then make is
> looking through the list of files in the directory and doing string
> comparisons to find the filename.  In this case, of course, the strings
> will not match so the VPATH lookup fails.

OK.

> There is a #define in the GNU make code called HAVE_CASE_INSENSITIVE_FS
> which you can set if your filesystem is case-insensitive.  Set it in
> config.h after the configure script has run; that might help.  If so we
> can think about whether this is something that should always be set for
> OSX.

I'm not sure about the "always".  It is my understanding that not all 
the FS
on MacOSX are case insensitive.