# target_link_options

Add link options to a target.

    target_link_options(<target> [BEFORE]
      <INTERFACE|PUBLIC|PRIVATE> [items1...]
      [<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])

Specify link options to use when linking a given target. The named `<target>` must have been created by a command such as `add_executable()` or `add_library()` and must not be an ALIAS target.

If `BEFORE` is specified, the content will be prepended to the property instead of being appended.

This command can be used to add any options, but alternative commands exist to add libraries (`target_link_libraries()` and `link_libraries()`). See documentation of the `directory` and `target` `LINK_OPTIONS` properties.

The `INTERFACE`, `PUBLIC` and `PRIVATE` keywords are required to specify the scope of the following arguments. `PRIVATE` and `PUBLIC` items will populate the `LINK_OPTIONS` property of `<target>`. `PUBLIC` and `INTERFACE` items will populate the `INTERFACE_LINK_OPTIONS` property of `<target>`. (IMPORTED targets only support `INTERFACE` items.) The following arguments specify link options. Repeated calls for the same `<target>` append items in the order called.

Arguments to `target_link_options` may use “generator expressions” with the syntax `$<...>`. See the `cmake-generator-expressions(7)` manual for available expressions. See the `cmake-buildsystem(7)` manual for more on defining buildsystem properties.

To pass options to the linker tool, each compiler driver has is own syntax. The `LINKER:` prefix can be used to specify, in a portable way, options to pass to the linker tool. The `LINKER:` prefix is replaced by the required driver option and the rest of the option string defines linker arguments using `,` as separator. These arguments will be formatted according to the `CMAKE_<LANG>_LINKER_WRAPPER_FLAG` and `CMAKE_<LANG>_LINKER_WRAPPER_FLAG_SEP` variables.

For example, `"LINKER:-z,defs"` becomes `-Xlinker -z -Xlinker defs` for `Clang` and `-Wl,-z,defs` for `GNU GCC`.

The final set of compile or link options used for a target is constructed by accumulating options from the current target and the usage requirements of it dependencies. The set of options is de-duplicated to avoid repetition. While beneficial for individual options, the de-duplication step can break up option groups. For example, `-D A -D B` becomes `-D A B`. One may specify a group of options using shell-like quoting along with a `SHELL:` prefix. The `SHELL:` prefix is dropped and the rest of the option string is parsed using the `separate_arguments()` `UNIX_COMMAND` mode. For example, `"SHELL:-D A" "SHELL:-D B"` becomes `-D A -D B`.