Commit 3f9b081f authored by Roger Leigh's avatar Roger Leigh Committed by Brad King

FindBoost: Add imported targets

Targets include:

- Boost::boost: Target for header-only dependencies
- Boost::<C>: Target for specific component dependency
- Boost::diagnostic_definitions: adds BOOST_LIB_DIAGNOSTIC
- Boost::disable_autolinking: adds BOOST_ALL_NO_LIB
- Boost::dynamic_linking: adds BOOST_ALL_DYN_LINK
parent 01c80acd
......@@ -54,6 +54,33 @@
# Boost_<C>_LIBRARY_DEBUG - Component <C> library debug variant
# Boost_<C>_LIBRARY_RELEASE - Component <C> library release variant
#
# The following :prop_tgt:`IMPORTED` targets are also defined::
#
# Boost::boost - Target for header-only dependencies
# (Boost include directory)
# Boost::<C> - Target for specific component dependency
# (shared or static library); <C> is lower-
# case
# Boost::diagnostic_definitions - interface target to enable diagnostic
# information about Boost's automatic linking
# during compilation (adds BOOST_LIB_DIAGNOSTIC)
# Boost::disable_autolinking - interface target to disable automatic
# linking with MSVC (adds BOOST_ALL_NO_LIB)
# Boost::dynamic_linking - interface target to enable dynamic linking
# linking with MSVC (adds BOOST_ALL_DYN_LINK)
#
# Implicit dependencies such as Boost::filesystem requiring
# Boost::system will be automatically detected and satisfied, even
# if system is not specified when using find_package and if
# Boost::system is not added to target_link_libraries. If using
# Boost::thread, then Thread::Thread will also be added automatically.
#
# It is important to note that the imported targets behave differently
# than variables created by this module: multiple calls to
# find_package(Boost) in the same directory or sub-directories with
# different options (e.g. static or shared) will not override the
# values of the targets created by the first call.
#
# 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
......@@ -142,6 +169,14 @@
# add_executable(foo foo.cc)
# endif()
#
# Example to find Boost libraries and use imported targets::
#
# find_package(Boost 1.56 REQUIRED COMPONENTS
# date_time filesystem iostreams)
# add_executable(foo foo.cc)
# target_link_libraries(foo Boost::date_time Boost::filesystem
# Boost::iostreams)
#
# Example to find Boost headers and some *static* libraries::
#
# set(Boost_USE_STATIC_LIBS ON) # only find static libs
......@@ -822,6 +857,16 @@ if(Boost_DEBUG)
"Boost_NO_SYSTEM_PATHS = ${Boost_NO_SYSTEM_PATHS}")
endif()
# Supply Boost_LIB_DIAGNOSTIC_DEFINITIONS as a convenience target. It
# will only contain any interface definitions on WIN32, but is created
# on all platforms to keep end user code free from platform dependent
# code. Also provide convenience targets to disable autolinking and
# enable dynamic linking.
if(NOT TARGET Boost::diagnostic_definitions)
add_library(Boost::diagnostic_definitions INTERFACE IMPORTED)
add_library(Boost::disable_autolinking INTERFACE IMPORTED)
add_library(Boost::dynamic_linking INTERFACE IMPORTED)
endif()
if(WIN32)
# In windows, automatic linking is performed, so you do not have
# to specify the libraries. If you are linking to a dynamic
......@@ -841,6 +886,12 @@ if(WIN32)
# code to emit a #pragma message each time a library is selected
# for linking.
set(Boost_LIB_DIAGNOSTIC_DEFINITIONS "-DBOOST_LIB_DIAGNOSTIC")
set_target_properties(Boost::diagnostic_definitions PROPERTIES
INTERFACE_COMPILE_DEFINITIONS "BOOST_LIB_DIAGNOSTIC")
set_target_properties(Boost::disable_autolinking PROPERTIES
INTERFACE_COMPILE_DEFINITIONS "BOOST_ALL_NO_LIB")
set_target_properties(Boost::dynamic_linking PROPERTIES
INTERFACE_COMPILE_DEFINITIONS "BOOST_ALL_DYN_LINK")
endif()
_Boost_CHECK_SPELLING(Boost_ROOT)
......@@ -1243,6 +1294,13 @@ endif()
# Add any missing components to the list.
_Boost_MISSING_DEPENDENCIES(Boost_FIND_COMPONENTS)
# If thread is required, get the thread libs as a dependency
list(FIND Boost_FIND_COMPONENTS thread _Boost_THREAD_DEPENDENCY_LIBS)
if(NOT _Boost_THREAD_DEPENDENCY_LIBS EQUAL -1)
include(CMakeFindDependencyMacro)
find_dependency(Threads)
endif()
# If the user changed any of our control inputs flush previous results.
if(_Boost_CHANGE_LIBDIR OR _Boost_CHANGE_LIBNAME)
foreach(COMPONENT ${_Boost_COMPONENTS_SEARCHED})
......@@ -1485,6 +1543,70 @@ else()
endforeach()
endif()
# ------------------------------------------------------------------------
# Add imported targets
# ------------------------------------------------------------------------
if(Boost_FOUND AND _Boost_IMPORTED_TARGETS)
# For header-only libraries
if(NOT TARGET Boost::boost)
add_library(Boost::boost INTERFACE IMPORTED)
if(Boost_INCLUDE_DIRS)
set_target_properties(Boost::boost PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${Boost_INCLUDE_DIRS}")
endif()
endif()
foreach(COMPONENT ${Boost_FIND_COMPONENTS})
if(NOT TARGET Boost::${COMPONENT})
string(TOUPPER ${COMPONENT} UPPERCOMPONENT)
if(Boost_${UPPERCOMPONENT}_FOUND)
if(Boost_USE_STATIC_LIBS)
add_library(Boost::${COMPONENT} STATIC IMPORTED)
else()
# Even if Boost_USE_STATIC_LIBS is OFF, we might have static
# libraries as a result.
add_library(Boost::${COMPONENT} UNKNOWN IMPORTED)
endif()
if(Boost_INCLUDE_DIRS)
set_target_properties(Boost::${COMPONENT} PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${Boost_INCLUDE_DIRS}")
endif()
if(EXISTS "${Boost_${UPPERCOMPONENT}_LIBRARY}")
set_target_properties(Boost::${COMPONENT} PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
IMPORTED_LOCATION "${Boost_${UPPERCOMPONENT}_LIBRARY}")
endif()
if(EXISTS "${Boost_${UPPERCOMPONENT}_LIBRARY_DEBUG}")
set_property(TARGET Boost::${COMPONENT} APPEND PROPERTY
IMPORTED_CONFIGURATIONS DEBUG)
set_target_properties(Boost::${COMPONENT} PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES_DEBUG "CXX"
IMPORTED_LOCATION_DEBUG "${Boost_${UPPERCOMPONENT}_LIBRARY_DEBUG}")
endif()
if(EXISTS "${Boost_${UPPERCOMPONENT}_LIBRARY_RELEASE}")
set_property(TARGET Boost::${COMPONENT} APPEND PROPERTY
IMPORTED_CONFIGURATIONS RELEASE)
set_target_properties(Boost::${COMPONENT} PROPERTIES
IMPORTED_LINK_INTERFACE_LANGUAGES_RELEASE "CXX"
IMPORTED_LOCATION_RELEASE "${Boost_${UPPERCOMPONENT}_LIBRARY_RELEASE}")
endif()
if(_Boost_${UPPERCOMPONENT}_DEPENDENCIES)
unset(_Boost_${UPPERCOMPONENT}_TARGET_DEPENDENCIES)
foreach(dep ${_Boost_${UPPERCOMPONENT}_DEPENDENCIES})
list(APPEND _Boost_${UPPERCOMPONENT}_TARGET_DEPENDENCIES Boost::${dep})
endforeach()
if(COMPONENT STREQUAL "thread")
list(APPEND _Boost_${UPPERCOMPONENT}_TARGET_DEPENDENCIES Threads::Threads)
endif()
set_target_properties(Boost::${COMPONENT} PROPERTIES
INTERFACE_LINK_LIBRARIES "${_Boost_${UPPERCOMPONENT}_TARGET_DEPENDENCIES}")
endif()
endif()
endif()
endforeach()
endif()
# ------------------------------------------------------------------------
# Notification to end user about what was found
# ------------------------------------------------------------------------
......
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