DESTDIR not used if CMAKE_INSTALL_PREFIX is absolute directory

[td-mpcdf]

Describe the bug
The DESTDIR variable given to make install is used for installation but the post-installation script does not account for it if the CMAKE_INSTALL_PREFIX is given as absolute path. This changed from earlier versions (2.7.1 works).

To Reproduce
cmake -build -DCMAKE_INSTALL_PREFIX=/my/installation
make -C build
make -C build install DESTDIR=${HOME}

Expected behavior
Installation should be done into ${HOME}/my/installation which works correctly.
After the installation step, the generate-adios2-config.sh is called which does not account for the DESTDIR variable and complains about a missing adios2-config.cmake file.

Desktop (please complete the following information):

• OS/Platform: SLES15
• Build with defaults

Additional context

Following up
Was the issue fixed? Please report back.

[vicentebolea]

This was resolved in #3850