Re: [Mingw-msys] Default install location for CMake

[Bill Hoffman <bill.hoffman@xxxxxxxxxxx>]

Gonzalo Garramuño wrote:
> Bill Hoffman wrote:
>> OK, so it sounds like /usr/local is a good default for the CMake install 
>> prefix for the MSYS Makefile generator in CMake.  Thanks for helping out!
>>
>> The trick now is to get CMake (a pure windows application), to know 
>> where /usr/local is on the disk.   The approach for that seems to be to 
>> run the following commands:
>>
>> sh.exe -c 'cd /usr/local; pwd -W'
>> if that fails then do this:
>>
>> sh.exe -c 'cd /usr; pwd -W'
>> and tack on /local to the answer.
>>
>> I guess there is no equivalent of cygpath in msys that can be used.
>>
> 
> No cygpath.
> 
> While some have recommended using sh -e "cd path; pwd -W", assuming you 
> don't mind writing more code, personally I would rely on the output of 
> mount.exe.  By finding if /usr/local or /usr is there, you can locate 
> the other paths.
> 
> $ mount
> C:\DOCUME~1\gga\CONFIG~1\Temp on /tmp type user (binmode,noumount)
> c:\ActiveState\perl on /perl type user (binmode)
> c:\msys\1.0\mingw on /mingw type user (binmode)
> \\aura001\\bin on /gga/bin type user (binmode)
> C:\msys\1.0 on / type user (binmode,noumount)
> C:\msys\1.0 on /usr type user (binmode,noumount)
> a: on /a type user (binmode,noumount)
> c: on /c type user (binmode,noumount)
> d: on /d type user (binmode,noumount)
> e: on /e type user (binmode,noumount)
> z: on /z type user (binmode,noumount)
> 
> The benefit of this is that you can run and parse this only once when 
> cmake starts, cache it in a hash, and then any command that needs to 
> find a path can locate the path by doing a case sensitive and case 
> insensitive search through the hash (msys is case insensitive, but samba 
> mounts might not be).
> 
> This makes not only /usr/local work but it would then make supporting 
> FIND_LIBRARY, FIND_PATH, etc. relatively easily and efficiently.  You 
> can also easily discard invalid paths early on without needing to run 
> any external process.
> 
> With sh -e, in the best scenario as it is with msys by default, you are 
> always forking a new process for each path you want to check which would 
> make FIND_LIBRARY and similar relatively slow as they often have to 
> check 5 to 10 paths.  In a worse case scenario, where sh.exe is not 
> bash, you end up forking not one but three processes.
> By using sh.exe, cmake also cannot tell before hand if the path is going 
> to be valid or not until the command fails.  And when it fails, you 
> might not know exactly why (is sh.exe or other command missing? is it 
> temporary network trouble? An invalid path?)
> 
> 
> 

So, this is heading where I did not want it go now....

CMake is a windows program, it should not have to parse mount tables and 
such.  It is one thing to get a default for install, and another to get 
the FIND_* stuff to look in /usr/local...

For all that to work and work easily, it seems like we should build 
CMake against the msys run time libraries.

-Bill


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