[lldb-dev] remote to debugserver

[Greg Clayton]

We don't do any case comparing at all with FileSpec and the performance will be horrible if we enable it. FileSpec objects have 2 ConstStrings: 1 for the dir, 1 for the basename. This means that comparing FileSpec objects are one or two pointer compares since the strings are unique and the pointer values states equality. 

I would be very careful what you do, unless it is a host wide setting (i.e. windows never has case sesitive FS, or always has it).

MacOSX can run with and without case sensitive file systems on a per volume basis, so it really isn't easy to enable/disable this for MacOSX.

If you have a case where there is never case sensitivity, then you could lowercase all string values as they get put into the FileSpec, but this will make the LLDB output ugly and not match the output from the debug info, and also would require that all paths be resolved to their volume so you would know when the filespec is on a case sensitive file system...

I would skip doing anything if you can, otherwise, we need to have a discussion how to handle this.

On Oct 17, 2012, at 4:02 PM, Filipe Cabecinhas <filcab+lldb-dev at gmail.com> wrote:

> But can't Windows have case-sensitive filesystems? I don't think changing == blindly is good for this case.
> But we have the problem of not knowing what FS we have and if it's case-sensitive or not.
> 
> If we're trying to find existing files, can't we stat() them (or something equivalent on windows)?
> 
> Regards,
> 
>   Filipe
> 
> 
> 
> On Wed, Oct 17, 2012 at 3:36 PM, Carlo Kok <ck at remobjects.com> wrote:
> Op 17-10-2012 22:54, Greg Clayton schreef:
> 
> 
> On Oct 17, 2012, at 1:48 PM, Carlo Kok <ck at remobjects.com> wrote:
> 
> When I attach to an osx debugserver running on a remote computer,
> sometimes my breakpoints properly get bound, sometimes they don't.
> I define my breakpoints before connecting to the remote server. Is
> this a known issue or should I try and dig deeper? It seems to work
> every time i step through the DynamicLoader*::OnAttach(); it's
> almost like I'm connecting to debugserver too soon. If this is a
> known issue, is there a workaround? If not, where can I look to
> narrow this down?
> 
> Run this before attaching:
> 
> (lldb) log enable lldb dyld
> 
> This will enable logging for the dynamic loader plug-ins. It will
> make the DynamicLoaderMacOSX log all the shared libraries it finds.
> Run it successfully and save the output. Then save the output from
> when it fails and compare the two.
> 
> It ended up being something much different. On Windows filenames aren't case sensitive; so for some reason sometimes I got a path with the proper caps, other times a path with a lowercase element in it. FileSpec needs a case insensitive compare for == on Windows (will add in the windows branch after some more testing)
> 
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