[CMake] XCode, CMAKE_CFG_INTDIR, and add_custom_command

[James Bigler]

So when I compile a regular C file, XCode puts the resulting object file
here:

/code/myproj/src/MyProj.build/Debug/mytarget.build/Objects-normal/i386/main.o

When I try to compile something else to an object file using an
add_custom_command and CMAKE_CFG_INTDIR I get this path:

${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/myfile.o ->
/code/myproj/src/Debug/myfile.o

The I run into problem of the directory /code/myproj/src/Debug/ not
existing.

So I have two choices.

1. Add the directory creation to the custom command.
2. Figure out how to get a path that actually exists.

What is the preferred method, and does anyone have hints of how to get an
actual build path for XCode?

It's too bad that add_custom_command doesn't detect that the path to the
output file doesn't exist and make it for me. ;)

Thanks,
James
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