[CMake] Cygwin drive paths are killing me

[Eric Wing]

I am currently in this unholy trinity of needing to use Android on
Windows through Cygwin.
Basically, the Android NDK requires Cygwin if you want to run it on
Windows. I'm using my fork of the Android-CMake toolchain originally
from OpenCV and trying to generate "Unix Makefiles" with CMake. I
provide a -C initial_cache list to try to pre-populate my dependency
list since this is a cross-compile.

This is really ugly stuff. I thought I was on the verge of finally
getting it working, but I keep bouncing back and forth between file
path problems:

- Cygwin returns absolute paths like /cygdrive/c/Program Files (x86)
- But CMake can't seem to resolve the /cygdrive/c part and when trying
to access files in this form, it fails with 'file not found'

If I change the representation to:
C:\Program Files (x86), then a lot of CMake functions seem to get
confused by the backslashes because they are escape sequences in
strings.

I figured out I can use forward slashes,
C:/Program Files (x86)
which helps the problem a little bit.

But sometimes when I change strings to make CMake happy, then if it
gets passed back to Cygwin to invoke some process, Cygwin dies.

I've been slowly going case by case to use one or the other. I finally
got my Makefiles generated. But now I gave the problem that the
Makefiles contain the C:\ form to get past CMake's problems. But when
I invoke make, Cygwin chokes with
*** target pattern contains no `%'
I think this is because of the colon characters in the make file from
the drive letters.


Also, I think there is a bug. CMake thinks strings like C:/Program
Files (x86) are relative paths, not absolute. Calling file(string ...)
keeps turning the path I pass into a relative path and prepends a full
relative path which makes the string turn into complete nonsense (I
get to drive letter markers in the string).


Anyway, am I overlooking something? I know Cygwin is supposed to work.
How am I supposed to deal with the /cygdrive/c vs C:\ and colon issue?

Thanks,
Eric
-- 
Beginning iPhone Games Development
http://playcontrol.net/iphonegamebook/