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Moving from RHEL7 to RHEL8 I note that RPM now include entries in /usr/lib/.build-id (see https://unix.stackexchange.com/questions/411727/what-is-the-purpose-of-usr-lib-build-id-dir and https://fedoraproject.org/wiki/Releases/FeatureBuildId for reference).

In integration tests I install RPMs using a fake DB and relocating them as in:

rpmdb --initdb --dbpath "$WSDIR"/rpmdb
rpm --relocate /opt/foo="$WSDIR"/opt/foo --dbpath "$WSDIR"/rpmdb -i foobar.rpm --nodeps 

The new path mean I must instead use:

rpm --relocate /opt/foo="$WSDIR"/opt/foo --relocate /usr/lib="$WSDIR"/usr/lib --dbpath "$WSDIR"/rpmdb -i foobar.rpm --nodeps 

With cmake, it is not possible to make /usr/lib relocatable unless I explicitly install a dummy file myself. For example:

install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/VERSION DESTINATION "/usr/lib" COMPONENT core RENAME "/usr/lib/.dummy/.foobar.core.dummy")
set(CPACK_RPM_CORE_RELOCATION_PATHS "/usr/lib")

Otherwise adding the relocation path is silently ignored.

I suggest the following:

• On platforms using /usr/lib/.build-id it should be possible to add a relocation for /usr/lib or at least /usr/lib/.build-id without installing an additional file.

• For variables that are used by cmake an error or warning should be issued if the requested operation cannot be performed. If I add:

  set(CPACK_RPM_CORE_RELOCATION_PATHS "/IDONOTEXIST")

There should be some message like "relocation ignored: no files installed to /IDONOTEXIST"

Also consider:

• Find a way to disable inclusion of /usr/lib/.build-id in RPMBuild There isn't one by design - see https://bugzilla.redhat.com/show_bug.cgi?id=1724153 but perhaps it could/should be made optional upstream. While this is outside the scope of cmake itself, the cmake maintainers may have useful opinions and a louder voice.