get_filename_component

Get a specific component of a full filename.

Changed in version 3.20: This command has been superseded by cmake_path() command, except REALPATH now offered by file(REAL_PATH) command and PROGRAM now available in separate_arguments(PROGRAM) command.

Changed in version 3.24: The undocumented feature offering the capability to query the Windows registry is superseded by cmake_host_system_information(QUERY WINDOWS_REGISTRY) command.

get_filename_component(<var> <FileName> <mode> [CACHE])

Sets <var> to a component of <FileName>, where <mode> is one of:

DIRECTORY = Directory without file name
NAME      = File name without directory
EXT       = File name longest extension (.b.c from d/a.b.c)
NAME_WE   = File name with neither the directory nor the longest extension
LAST_EXT  = File name last extension (.c from d/a.b.c)
NAME_WLE  = File name with neither the directory nor the last extension
PATH      = Legacy alias for DIRECTORY (use for CMake <= 2.8.11)

New in version 3.14: Added the LAST_EXT and NAME_WLE modes.

Paths are returned with forward slashes and have no trailing slashes. If the optional CACHE argument is specified, the result variable is added to the cache.

get_filename_component(<var> <FileName> <mode> [BASE_DIR <dir>] [CACHE])

New in version 3.4.

Sets <var> to the absolute path of <FileName>, where <mode> is one of:

ABSOLUTE  = Full path to file
REALPATH  = Full path to existing file with symlinks resolved

If the provided <FileName> is a relative path, it is evaluated relative to the given base directory <dir>. If no base directory is provided, the default base directory will be CMAKE_CURRENT_SOURCE_DIR.

Paths are returned with forward slashes and have no trailing slashes. If the optional CACHE argument is specified, the result variable is added to the cache.

get_filename_component(<var> <FileName> PROGRAM [PROGRAM_ARGS <arg_var>] [CACHE])

The program in <FileName> will be found in the system search path or left as a full path. If PROGRAM_ARGS is present with PROGRAM, then any command-line arguments present in the <FileName> string are split from the program name and stored in <arg_var>. This is used to separate a program name from its arguments in a command line string.