cmake DESTDIR support is broken

[davvid]

System Information (OS, Hardware, etc.)

Linux RHEL7

Package Versions

N/A

Build Flags

Set the install prefix to a non-writable directory

Steps to Reproduce

$ mkdir -p build
$ cd build
$ cmake -D CMAKE_INSTALL_PREFIX=/usr/local/foo ..
$ make DESTDIR=/tmp/foo install
[....]
Install the project...
-- Install configuration: "Release"
CMake Error at pxr/cmake_install.cmake:36 (file):
  file Internal CMake error when trying to open file:
  /usr/local/foo/lib/python/pxr/__init__.py for writing.
Call Stack (most recent call first):
  cmake_install.cmake:37 (INCLUDE)

I'll submit a pull request shortly with a proposed solution.

[jtran56]

Filed as internal issue #138888.