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# FindBoost

Find Boost include dirs and libraries

Use this module by invoking find_package with the form:

    find_package(Boost
      [version] [EXACT]      # Minimum or EXACT version e.g. 1.36.0
      [REQUIRED]             # Fail with error if Boost is not found
      [COMPONENTS <libs>...] # Boost libraries by their canonical name
      )                      # e.g. "date_time" for "libboost_date_time"

This module finds headers and requested component libraries OR a CMake package configuration file provided by a “Boost CMake” build. For the latter case skip to the “Boost CMake” section below. For the former case results are reported in variables:

    Boost_FOUND            - True if headers and requested libraries were found
    Boost_INCLUDE_DIRS     - Boost include directories
    Boost_LIBRARY_DIRS     - Link directories for Boost libraries
    Boost_LIBRARIES        - Boost component libraries to be linked
    Boost_<C>_FOUND        - True if component <C> was found (<C> is upper-case)
    Boost_<C>_LIBRARY      - Libraries to link for component <C> (may include
                             target_link_libraries debug/optimized keywords)
    Boost_VERSION          - BOOST_VERSION value from boost/version.hpp
    Boost_LIB_VERSION      - Version string appended to library filenames
    Boost_MAJOR_VERSION    - Boost major version number (X in X.y.z)
    Boost_MINOR_VERSION    - Boost minor version number (Y in x.Y.z)
    Boost_SUBMINOR_VERSION - Boost subminor version number (Z in x.y.Z)
    Boost_LIB_DIAGNOSTIC_DEFINITIONS (Windows)
                           - Pass to add_definitions() to have diagnostic
                             information about Boost's automatic linking
                             displayed during compilation

This module reads hints about search locations from variables:

    BOOST_ROOT             - Preferred installation prefix
     (or BOOSTROOT)
    BOOST_INCLUDEDIR       - Preferred include directory e.g. <prefix>/include
    BOOST_LIBRARYDIR       - Preferred library directory e.g. <prefix>/lib
    Boost_NO_SYSTEM_PATHS  - Set to ON to disable searching in locations not
                             specified by these hint variables. Default is OFF.
    Boost_ADDITIONAL_VERSIONS
                           - List of Boost versions not known to this module
                             (Boost install locations may contain the version)

and saves search results persistently in CMake cache entries:

    Boost_INCLUDE_DIR         - Directory containing Boost headers
    Boost_LIBRARY_DIR         - Directory containing Boost libraries
    Boost_<C>_LIBRARY_DEBUG   - Component <C> library debug variant
    Boost_<C>_LIBRARY_RELEASE - Component <C> library release variant

Users may set these hints or results as cache entries. Projects should not read these entries directly but instead use the above result variables. Note that some hint names start in upper-case “BOOST”. One may specify these as environment variables if they are not specified as CMake variables or cache entries.

This module first searches for the Boost header files using the above hint variables (excluding BOOST_LIBRARYDIR) and saves the result in Boost_INCLUDE_DIR. Then it searches for requested component libraries using the above hints (excluding BOOST_INCLUDEDIR and Boost_ADDITIONAL_VERSIONS), “lib” directories near Boost_INCLUDE_DIR, and the library name configuration settings below. It saves the library directory in Boost_LIBRARY_DIR and individual library locations in Boost_<C>_LIBRARY_DEBUG and Boost_<C>_LIBRARY_RELEASE. When one changes settings used by previous searches in the same build tree (excluding environment variables) this module discards previous search results affected by the changes and searches again.

Boost libraries come in many variants encoded in their file name. Users or projects may tell this module which variant to find by setting variables:

    Boost_USE_MULTITHREADED  - Set to OFF to use the non-multithreaded
                               libraries ('mt' tag).  Default is ON.
    Boost_USE_STATIC_LIBS    - Set to ON to force the use of the static
                               libraries.  Default is OFF.
    Boost_USE_STATIC_RUNTIME - Set to ON or OFF to specify whether to use
                               libraries linked statically to the C++ runtime
                               ('s' tag).  Default is platform dependent.
    Boost_USE_DEBUG_RUNTIME  - Set to ON or OFF to specify whether to use
                               libraries linked to the MS debug C++ runtime
                               ('g' tag).  Default is ON.
    Boost_USE_DEBUG_PYTHON   - Set to ON to use libraries compiled with a
                               debug Python build ('y' tag). Default is OFF.
    Boost_USE_STLPORT        - Set to ON to use libraries compiled with
                               STLPort ('p' tag).  Default is OFF.
    Boost_USE_STLPORT_DEPRECATED_NATIVE_IOSTREAMS
                             - Set to ON to use libraries compiled with
                               STLPort deprecated "native iostreams"
                               ('n' tag).  Default is OFF.
    Boost_COMPILER           - Set to the compiler-specific library suffix
                               (e.g. "-gcc43").  Default is auto-computed
                               for the C++ compiler in use.
    Boost_THREADAPI          - Suffix for "thread" component library name,
                               such as "pthread" or "win32".  Names with
                               and without this suffix will both be tried.
    Boost_NAMESPACE          - Alternate namespace used to build boost with
                               e.g. if set to "myboost", will search for
                               myboost_thread instead of boost_thread.

Other variables one may set to control this module are:

    Boost_DEBUG              - Set to ON to enable debug output from FindBoost.
                               Please enable this before filing any bug report.
    Boost_DETAILED_FAILURE_MSG
                             - Set to ON to add detailed information to the
                               failure message even when the REQUIRED option
                               is not given to the find_package call.
    Boost_REALPATH           - Set to ON to resolve symlinks for discovered
                               libraries to assist with packaging.  For example,
                               the "system" component library may be resolved to
                               "/usr/lib/libboost_system.so.1.42.0" instead of
                               "/usr/lib/libboost_system.so".  This does not
                               affect linking and should not be enabled unless
                               the user needs this information.

On Visual Studio and Borland compilers Boost headers request automatic linking to corresponding libraries. This requires matching libraries to be linked explicitly or available in the link library search path. In this case setting Boost_USE_STATIC_LIBS to OFF may not achieve dynamic linking. Boost automatic linking typically requests static libraries with a few exceptions (such as Boost.Python). Use:

    add_definitions(${Boost_LIB_DIAGNOSTIC_DEFINITIONS})

to ask Boost to report information about automatic linking requests.

Example to find Boost headers only:

    find_package(Boost 1.36.0)
    if(Boost_FOUND)
      include_directories(${Boost_INCLUDE_DIRS})
      add_executable(foo foo.cc)
    endif()

Example to find Boost headers and some static libraries:

    set(Boost_USE_STATIC_LIBS        ON) # only find static libs
    set(Boost_USE_MULTITHREADED      ON)
    set(Boost_USE_STATIC_RUNTIME    OFF)
    find_package(Boost 1.36.0 COMPONENTS date_time filesystem system ...)
    if(Boost_FOUND)
      include_directories(${Boost_INCLUDE_DIRS})
      add_executable(foo foo.cc)
      target_link_libraries(foo ${Boost_LIBRARIES})
    endif()

## Boost CMake

If Boost was built using the boost-cmake project it provides a package configuration file for use with find_package’s Config mode. This module looks for the package configuration file called BoostConfig.cmake or boost-config.cmake and stores the result in cache entry “Boost_DIR”. If found, the package configuration file is loaded and this module returns with no further action. See documentation of the Boost CMake package configuration for details on what it provides.

Set Boost_NO_BOOST_CMAKE to ON to disable the search for boost-cmake.

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