[cmake-developers] depend problem on windows

[Bill Hoffman]

On 3/17/2012 8:26 PM, Peter Collingbourne wrote:

> Most likely some object files were not rebuilt as a result of header
> file changes.  This will happen if the compiler does not support
> emitting dependency files, such as cl.exe.  I think there are a couple
> of ways we could consider supporting cl.exe here:
>
> 1) Integrate CMake's built in dependency scanner.  This will require
>     some thought because the dependency scanner works on a per-target
>     basis and Ninja reads dependency files on a per-file basis.
>
> 2) Come up with a way to use cl.exe's /showIncludes option to build a
>     dependency list.  There has been some discussion of this topic on
>     the Ninja mailing list:
>     https://groups.google.com/group/ninja-build/search?group=ninja-build&q=showincludes&qt_g=Search+this+group
>
Oh my....


So, the windows ninja generator IMO is totally useless right now... 
Without depend information on .h files incremental builds just won't 
work.   I wonder if this is why the BuildDepend test is failing...  If 
not, we should certainly add a test that touches a .h file and makes 
sure things rebuild.   BuildDepend is also failing on the Mac, does 
ninja have the same issue with llvm?

This looks like it should work:
https://github.com/sgraham/ninja/blob/master/misc/cldeps.cc

https://groups.google.com/group/ninja-build/browse_thread/thread/5d73ad7d26fba84d/898d7f0c808a32b0?lnk=gst&q=showincludes#898d7f0c808a32b0

Is there a chance of getting this moved to master in ninja?  Can we move 
it to the ninja windows binary that we are using for CMake?

-Bill