endif()
endmacro()
+set(ZNC_CMAKE_FIND_DEPS "")
+
tristate_option(OPENSSL "Support SSL")
if(WANT_OPENSSL)
find_package(OpenSSL ${TRISTATE_OPENSSL_REQUIRED})
HAVE_SSL_SESSION_get0_cipher)
endfunction()
check_SSL_SESSION_get0_cipher()
+ set(ZNC_CMAKE_FIND_DEPS
+ "${ZNC_CMAKE_FIND_DEPS}\nfind_dependency(OpenSSL)")
endif()
endif()
set(HAVE_LIBSSL "${OPENSSL_FOUND}")
pkg_check_modules(ICU ${TRISTATE_ICU_REQUIRED} IMPORTED_TARGET icu-uc)
endif()
set(HAVE_ICU "${ICU_FOUND}")
+if(ICU_FOUND)
+ set(ZNC_CMAKE_FIND_DEPS "${ZNC_CMAKE_FIND_DEPS}\nfind_dependency_pc(ICU icu-uc)")
+endif()
set(WANT_PERL false CACHE BOOL "Support Perl modules")
set(WANT_PYTHON false CACHE BOOL "Support Python modules")
write_basic_package_version_file("ZNCConfigVersion.cmake"
COMPATIBILITY AnyNewerVersion)
install(FILES
+ "${PROJECT_SOURCE_DIR}/cmake/CMakeFindDependencyMacroPC.cmake"
"${PROJECT_BINARY_DIR}/ZNCConfig.cmake"
"${PROJECT_BINARY_DIR}/ZNCConfigVersion.cmake"
DESTINATION "${CMAKE_INSTALL_DATADIR}/znc/cmake")
--- /dev/null
+# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CMakeFindDependencyMacro
+------------------------
+
+.. command:: find_dependency
+
+ The ``find_dependency()`` macro wraps a :command:`find_package` call for
+ a package dependency::
+
+ find_dependency(<dep> [...])
+
+ It is designed to be used in a
+ :ref:`Package Configuration File <Config File Packages>`
+ (``<PackageName>Config.cmake``). ``find_dependency`` forwards the correct
+ parameters for ``QUIET`` and ``REQUIRED`` which were passed to
+ the original :command:`find_package` call. Any additional arguments
+ specified are forwarded to :command:`find_package`.
+
+ If the dependency could not be found it sets an informative diagnostic
+ message and calls :command:`return` to end processing of the calling
+ package configuration file and return to the :command:`find_package`
+ command that loaded it.
+
+ .. note::
+
+ The call to :command:`return` makes this macro unsuitable to call
+ from :ref:`Find Modules`.
+
+Package Dependency Search Optimizations
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If ``find_dependency`` is called with arguments identical to a previous
+call in the same directory, perhaps due to diamond-shaped package
+dependencies, the underlying call to :command:`find_package` is optimized
+out. This optimization is important to support large package dependency
+graphs while avoiding a combinatorial explosion of repeated searches.
+However, the heuristic cannot account for ambient variables that
+affect package behavior, such as ``<PackageName>_USE_STATIC_LIBS``,
+offered by some packages. Therefore package configuration files should
+avoid setting such variables before their calls to ``find_dependency``.
+
+.. versionchanged:: 3.15
+ Previously, the underlying call to :command:`find_package` was always
+ optimized out if the package had already been found. CMake 3.15
+ removed the optimization to support cases in which ``find_dependency``
+ call arguments request different components.
+
+.. versionchanged:: 3.26
+ The pre-3.15 optimization was restored, but with the above-described
+ heuristic to account for varying ``find_dependency`` call arguments.
+
+#]=======================================================================]
+
+macro(find_dependency_pc dep)
+find_dependency(PkgConfig)
+ string(SHA256 cmake_fd_call_hash "${dep};${ARGN};${${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED}")
+ if(_CMAKE_${dep}_${cmake_fd_call_hash}_FOUND)
+ unset(cmake_fd_call_hash)
+ else()
+ list(APPEND _CMAKE_${dep}_HASH_STACK ${cmake_fd_call_hash})
+ set(cmake_fd_quiet_arg)
+ if(${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
+ set(cmake_fd_quiet_arg QUIET)
+ endif()
+ set(cmake_fd_required_arg)
+ if(${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
+ set(cmake_fd_required_arg REQUIRED)
+ endif()
+
+ get_property(cmake_fd_alreadyTransitive GLOBAL PROPERTY
+ _CMAKE_${dep}_TRANSITIVE_DEPENDENCY
+ )
+
+ pkg_check_modules(${dep}
+ ${cmake_fd_quiet_arg}
+ ${cmake_fd_required_arg}
+ IMPORTED_TARGET ${ARGN}
+ )
+ list(POP_BACK _CMAKE_${dep}_HASH_STACK cmake_fd_call_hash)
+ set("_CMAKE_${dep}_${cmake_fd_call_hash}_FOUND" "${${dep}_FOUND}")
+
+ if(NOT DEFINED cmake_fd_alreadyTransitive OR cmake_fd_alreadyTransitive)
+ set_property(GLOBAL PROPERTY _CMAKE_${dep}_TRANSITIVE_DEPENDENCY TRUE)
+ endif()
+
+ unset(cmake_fd_alreadyTransitive)
+ unset(cmake_fd_call_hash)
+ unset(cmake_fd_quiet_arg)
+ unset(cmake_fd_required_arg)
+ if (NOT ${dep}_FOUND)
+ set(${CMAKE_FIND_PACKAGE_NAME}_NOT_FOUND_MESSAGE "${CMAKE_FIND_PACKAGE_NAME} could not be found because dependency ${dep} could not be found.")
+ set(${CMAKE_FIND_PACKAGE_NAME}_FOUND False)
+ return()
+ endif()
+ endif()
+endmacro()