CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES

Implicit linker search path detected for language <LANG>.

Compilers typically pass directories containing language runtime libraries and default library search paths when they invoke a linker. These paths are implicit linker search directories for the compiler's language. For each language enabled by the project() or enable_language() command, CMake automatically detects these directories and reports the results in this variable.

When linking to a static library, CMake adds the implicit link directories from this variable for each language used in the static library (except the language whose compiler is used to drive linking). In the case of an imported static library, the IMPORTED_LINK_INTERFACE_LANGUAGES target property lists the languages whose implicit link information is needed. If any of the languages is not enabled, its value for the CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES variable may instead be provided by the project. Or, a toolchain file may set the variable to a value known for the specified toolchain. It will either be overridden when the language is enabled, or used as a fallback.

Some toolchains read implicit directories from an environment variable such as LIBRARY_PATH. If using such an environment variable, keep its value consistent when operating in a given build tree because CMake saves the value detected when first creating a build tree.

If policy CMP0060 is not set to NEW, then when a library in one of these directories is given by full path to target_link_libraries() CMake will generate the -l<name> form on link lines for historical purposes.

See also the CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES variable.