119 lines
5.2 KiB
CMake
119 lines
5.2 KiB
CMake
 
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# Findw32-pthreads.cmake -- last-resort fallback, Windows only.
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#
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# WHY THIS EXISTS
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#
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# obs-studio's libobs links `PUBLIC OBS::w32-pthreads` on Windows
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# (libobs/cmake/os-windows.cmake), so the libobsConfig.cmake it installs
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# carries an unconditional, REQUIRED dependency on a findable `w32-pthreads`
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# CMake package:
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#
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# if(MSVC)
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# find_dependency(w32-pthreads REQUIRED)
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# endif()
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#
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# obs-studio *does* export that package -- deps/w32-pthreads/CMakeLists.txt
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# ends in `target_export(w32-pthreads)` -- but it exports it to
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# <prefix>/cmake/w32-pthreads/, the same OBS_CMAKE_DESTINATION shape that
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# find_package's Config-mode search suffixes never look at. The top-level
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# CMakeLists.txt therefore points `w32-pthreads_DIR` straight at it, exactly
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# as it already does for `libobs_DIR`, and that is the path this build is
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# expected to take.
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#
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# This module is only reached when that export is genuinely absent from
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# .deps/ -- for instance if a future obs-studio changes where or whether
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# deps/w32-pthreads installs its package, or if the tolerated
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# UI/obs-frontend-api install error in
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# cmake/common/buildspec_common.cmake::_setup_obs_studio ever starts aborting
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# the install *before* libobs's own subtree instead of after it. In that case
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# the alternative is a hard configure failure inside libobsConfig.cmake with
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# no plugin module built at all, so reconstructing the imported target by
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# hand from artifacts the bootstrap definitely produced is strictly better.
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#
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# It deliberately lives in cmake/windows/find-fallback/ and NOT in
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# cmake/windows/, which cmake/common/osconfig.cmake puts on CMAKE_MODULE_PATH
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# for every Windows configure. A Findw32-pthreads.cmake on the default module
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# path would win over OBS's own exported package on every single build
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# (find_package tries MODULE mode before CONFIG mode), permanently replacing
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# upstream's real export metadata with this approximation. The top-level
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# CMakeLists.txt appends this directory to CMAKE_MODULE_PATH only when it has
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# already established that the real export is missing.
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#
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# Nothing outside Windows ever loads this: the find_dependency above is
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# inside `if(MSVC)`, and the CMAKE_MODULE_PATH append that exposes this file
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# is inside `if(OS_WINDOWS ...)`.
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if(TARGET OBS::w32-pthreads)
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set(w32-pthreads_FOUND TRUE)
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return()
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endif()
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# Resolve paths from this file's own location rather than
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# CMAKE_CURRENT_SOURCE_DIR: a find module runs in whatever scope called
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# find_package, and here that call comes from inside libobsConfig.cmake.
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# <repo>/cmake/windows/find-fallback/ -> <repo>
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get_filename_component(_w32pt_repo_root "${CMAKE_CURRENT_LIST_DIR}/../../.." ABSOLUTE)
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set(_w32pt_deps "${_w32pt_repo_root}/.deps")
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# Search order, both from obs-studio's own Windows layout:
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# 1. the bootstrap's install prefix -- obs-studio/cmake/windows/defaults.cmake
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# sets OBS_LIBRARY_DESTINATION=lib (ARCHIVE, i.e. the import library),
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# OBS_EXECUTABLE_DESTINATION=bin/64bit (RUNTIME, i.e. the DLL) and
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# OBS_INCLUDE_DESTINATION=include (where target_export installs
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# w32-pthreads' PUBLIC_HEADER pthread.h/sched.h);
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# 2. the obs-studio build tree the bootstrap just built in, in case the
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# install step is what failed rather than the export.
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file(GLOB _w32pt_build_trees "${_w32pt_deps}/obs-studio-*/build_*/deps/w32-pthreads/Release")
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file(GLOB _w32pt_source_trees "${_w32pt_deps}/obs-studio-*/deps/w32-pthreads")
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find_library(
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w32-pthreads_IMPLIB
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NAMES w32-pthreads
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PATHS "${_w32pt_deps}/lib" ${_w32pt_build_trees}
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NO_DEFAULT_PATH
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)
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find_file(
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w32-pthreads_RUNTIME_LIBRARY
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NAMES w32-pthreads.dll
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PATHS "${_w32pt_deps}/bin/64bit" ${_w32pt_build_trees}
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NO_DEFAULT_PATH
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)
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find_path(
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w32-pthreads_INCLUDE_DIR
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NAMES pthread.h
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PATHS "${_w32pt_deps}/include" ${_w32pt_source_trees}
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NO_DEFAULT_PATH
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)
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(
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w32-pthreads
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REQUIRED_VARS w32-pthreads_IMPLIB w32-pthreads_INCLUDE_DIR
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REASON_FAILURE_MESSAGE
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"The OBS SDK bootstrap neither exported a w32-pthreads CMake package under ${_w32pt_deps}/cmake/ nor left a w32-pthreads import library anywhere under ${_w32pt_deps}."
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)
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if(w32-pthreads_FOUND)
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# SHARED, matching deps/w32-pthreads/CMakeLists.txt's own
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# `add_library(w32-pthreads SHARED ...)`. IMPORTED_LOCATION is the DLL and
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# IMPORTED_IMPLIB the .lib, which is what an imported SHARED library means
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# on Windows; if only the .lib was found, declare it UNKNOWN instead so
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# CMake does not demand a DLL it will never be handed.
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if(w32-pthreads_RUNTIME_LIBRARY)
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add_library(OBS::w32-pthreads SHARED IMPORTED)
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set_target_properties(
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OBS::w32-pthreads
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PROPERTIES IMPORTED_LOCATION "${w32-pthreads_RUNTIME_LIBRARY}" IMPORTED_IMPLIB "${w32-pthreads_IMPLIB}"
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)
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else()
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add_library(OBS::w32-pthreads UNKNOWN IMPORTED)
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set_target_properties(OBS::w32-pthreads PROPERTIES IMPORTED_LOCATION "${w32-pthreads_IMPLIB}")
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endif()
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set_target_properties(
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OBS::w32-pthreads
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PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${w32-pthreads_INCLUDE_DIR}"
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)
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message(STATUS "Findw32-pthreads (fallback): OBS::w32-pthreads -> ${w32-pthreads_IMPLIB}")
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endif()
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mark_as_advanced(w32-pthreads_IMPLIB w32-pthreads_RUNTIME_LIBRARY w32-pthreads_INCLUDE_DIR)
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