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cmake: update threads

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For consistency with other backend/provider selection, allow
`USE_THREADS` to select the threads provider.
This commit is contained in:
Edward Thomson
2024-12-31 11:40:44 +00:00
parent 890d70856c
commit 2b581ef517
6 changed files with 54 additions and 20 deletions
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41
cmake/SelectThreads.cmake Normal file
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@@ -0,0 +1,41 @@
include(SanitizeBool)
sanitizebool(USE_THREADS)
if(NOT WIN32)
find_package(Threads)
endif()
if((USE_THREADS STREQUAL ON OR USE_THREADS STREQUAL "") AND THREADS_FOUND)
set(USE_THREADS "pthreads")
elseif((USE_THREADS STREQUAL ON OR USE_THREADS STREQUAL "") AND WIN32)
set(USE_THREADS "win32")
elseif(USE_THREADS STREQUAL "")
set(USE_THREADS OFF)
endif()
if(USE_THREADS STREQUAL "pthreads")
if(NOT THREADS_FOUND)
message(FATAL_ERROR "pthreads were requested but not found")
endif()
list(APPEND LIBGIT2_SYSTEM_LIBS ${CMAKE_THREAD_LIBS_INIT})
list(APPEND LIBGIT2_PC_LIBS ${CMAKE_THREAD_LIBS_INIT})
set(GIT_THREADS 1)
set(GIT_THREADS_PTHREADS 1)
add_feature_info("Threads" ON "using pthreads")
elseif(USE_THREADS STREQUAL "win32")
if(NOT WIN32)
message(FATAL_ERROR "Win32 API support is not available on this platform")
endif()
set(GIT_THREADS 1)
set(GIT_THREADS_WIN32 1)
add_feature_info("Threads" ON "using Win32 APIs")
elseif(USE_THREADS STREQUAL OFF)
set(GIT_THREADS 0)
add_feature_info("Threads" OFF "threads support is disabled")
else()
message(FATAL_ERROR "unknown threads option: ${USE_THREADS}")
endif()