CMP0193

Added in version 4.1.

GNUInstallDirs caches CMAKE_INSTALL_* with leading usr/ for install prefix /.

When CMAKE_INSTALL_PREFIX is /, the CMAKE_INSTALL_<dir> variables, for <dir> equal to BINDIR, SBINDIR, LIBEXECDIR, SHAREDSTATEDIR, INCLUDEDIR, OLDINCLUDEDIR, DATAROOTDIR, and LIBDIR, are prepended with a leading usr/ as documented among the special cases. In CMake 4.0 and below, these CMAKE_INSTALL_<dir> variables were cached without their leading usr/, and it was prepended in normal variables that shadow their cache entries. CMake 4.1 and above prefer to cache CMAKE_INSTALL_<dir> with their leading usr/. Consequently, the GNUInstallDirs_get_absolute_install_dir() command no longer alters the relative input variable argument <input-var>. This policy provides compatibility for projects that have not been updated to expect the new behavior.

The OLD behavior for this policy is to cache CMAKE_INSTALL_<dir> variables without the leading usr/. The NEW behavior for this policy is to cache CMAKE_INSTALL_<dir> variables with the leading usr/.

This policy was introduced in CMake version 4.1. It may be set by cmake_policy() or cmake_minimum_required(). If it is not set, CMake does not warn, and uses OLD behavior.

Note

The OLD behavior of a policy is deprecated by definition and may be removed in a future version of CMake.