Semicolon-separated list of directories to be ignored by the various find...() commands.

For find_program(), find_library(), find_file(), and find_path(), any file found in one of the listed directories will be ignored. The listed directories do not apply recursively, so any subdirectories to be ignored must also be explicitly listed. CMAKE_IGNORE_PATH does not affect the search prefixes used by these four commands. To ignore individual paths under a search prefix (e.g. bin, include, lib, etc.), each path must be listed in CMAKE_IGNORE_PATH as a full absolute path. CMAKE_IGNORE_PREFIX_PATH provides a more appropriate way to ignore a whole search prefix.

find_package() is also affected by CMAKE_IGNORE_PATH, but only for Config mode searches. Any <Name>Config.cmake or <name>-config.cmake file found in one of the specified directories will be ignored. In addition, any search prefix found in CMAKE_IGNORE_PATH will be skipped for backward compatibility reasons, but new code should prefer to use CMAKE_IGNORE_PREFIX_PATH to ignore prefixes instead.

Ignoring search locations can be useful in cross-compiling environments where some system directories contain incompatible but possibly linkable libraries. For example, on cross-compiled cluster environments, this allows a user to ignore directories containing libraries meant for the front-end machine.

By default, CMAKE_IGNORE_PATH is empty. It is intended to be set by the project or the end user.

See also the following variables: