[CMake] to_cmake_path/to_native_path oddities

[Bill Hoffman]

Axel Roebel wrote:

> Hi Bill,
> 
> Ok I see you mean running the windows binary from the command line.
> However,it does not work with unix makefiles. 
> It uses windows paths in a unix makefile. 
> I don't see in which situation this could be useful.
> 
> I get
> rec-1320: (build) 334> make
> libfft/src/CMakeFiles/fft_static.dir/build.make:53: *** target pattern 
> contains no `%'.  Stop.
> make[1]: *** [libfft/src/CMakeFiles/fft_static.dir/all] Error 2
> make: *** [all] Error 2
> 
> The makefile is actually invalid.
> 
That is a bug in the cygwin make.  I have patched the upstream make and 
the next major release of make will work fine.  Until then, you can 
replace your cygwin make with this one:

http://www.cmake.org/files/cygwin/make.exe

(Search the cygwin mailing list for the full discussion if you are 
interested...)
>>>>> This seems already somewhat buggy tpo me because I would have expected
>>>>> that in a unix makefile generator the variable should be automatically
>>>>> converted to unix path style.
>>>> The path should be converted before it is actually used if you pass it
>>>> to say include_directories.
>>> I would like to, but I actually can't in cmake. I think this is a problem
>>> of cmake.
>> What error do you get?
> 
> ???
> I don't get an error, there is simply no function to convert a windows path 
> into a unix path. I understand I have to make my own macro.
> 
I meant why do you have to convert the include path?  (Ahh, could be 
related to the make issue above...)

-Bill