93 lines
3.8 KiB
CMake
93 lines
3.8 KiB
CMake
# - Use compat library providing various functions and macros that may be missing on some systems
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# Once done this will define
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#
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# compatsrc - sources to add to compilation
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#
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# Additionally, "compat.h" include directory is added and can be included.
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#
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# Author Michal Vasko <mvasko@cesnet.cz>
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# Copyright (c) 2021 - 2023 CESNET, z.s.p.o.
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#
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# This source code is licensed under BSD 3-Clause License (the "License").
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# You may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://opensource.org/licenses/BSD-3-Clause
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#
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include(CheckSymbolExists)
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include(CheckIncludeFile)
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include(TestBigEndian)
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if(POLICY CMP0075)
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cmake_policy(SET CMP0075 NEW)
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endif()
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macro(USE_COMPAT)
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# compatibility checks
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list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_POSIX_C_SOURCE=200809L)
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list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
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list(APPEND CMAKE_REQUIRED_DEFINITIONS -D__BSD_VISIBLE=1)
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check_symbol_exists(_POSIX_TIMERS "unistd.h" HAVE_CLOCK)
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if(NOT HAVE_CLOCK)
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message(FATAL_ERROR "Missing support for clock_gettime() and similar functions!")
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endif()
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set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
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find_package(Threads)
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list(APPEND CMAKE_REQUIRED_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
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check_symbol_exists(pthread_mutex_timedlock "pthread.h" HAVE_PTHREAD_MUTEX_TIMEDLOCK)
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check_symbol_exists(pthread_mutex_clocklock "pthread.h" HAVE_PTHREAD_MUTEX_CLOCKLOCK)
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check_symbol_exists(pthread_rwlock_timedrdlock "pthread.h" HAVE_PTHREAD_RWLOCK_TIMEDRDLOCK)
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check_symbol_exists(pthread_rwlock_clockrdlock "pthread.h" HAVE_PTHREAD_RWLOCK_CLOCKRDLOCK)
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check_symbol_exists(pthread_rwlock_timedwrlock "pthread.h" HAVE_PTHREAD_RWLOCK_TIMEDWRLOCK)
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check_symbol_exists(pthread_rwlock_clockwrlock "pthread.h" HAVE_PTHREAD_RWLOCK_CLOCKWRLOCK)
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check_symbol_exists(pthread_cond_clockwait "pthread.h" HAVE_PTHREAD_COND_CLOCKWAIT)
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if(HAVE_PTHREAD_MUTEX_CLOCKLOCK)
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# can use CLOCK_MONOTONIC only if we have pthread_mutex_clocklock()
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check_symbol_exists(_POSIX_MONOTONIC_CLOCK "unistd.h" HAVE_CLOCK_MONOTONIC)
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endif()
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if(HAVE_CLOCK_MONOTONIC)
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set(COMPAT_CLOCK_ID "CLOCK_MONOTONIC")
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else()
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set(COMPAT_CLOCK_ID "CLOCK_REALTIME")
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endif()
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check_symbol_exists(vdprintf "stdio.h;stdarg.h" HAVE_VDPRINTF)
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check_symbol_exists(asprintf "stdio.h" HAVE_ASPRINTF)
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check_symbol_exists(vasprintf "stdio.h" HAVE_VASPRINTF)
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check_symbol_exists(getline "stdio.h" HAVE_GETLINE)
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check_symbol_exists(strndup "string.h" HAVE_STRNDUP)
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check_symbol_exists(strnstr "string.h" HAVE_STRNSTR)
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check_symbol_exists(strdupa "string.h" HAVE_STRDUPA)
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check_symbol_exists(strchrnul "string.h" HAVE_STRCHRNUL)
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check_symbol_exists(get_current_dir_name "unistd.h" HAVE_GET_CURRENT_DIR_NAME)
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check_function_exists(timegm HAVE_TIMEGM)
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# crypt
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check_include_file("crypt.h" HAVE_CRYPT_H)
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if(${CMAKE_SYSTEM_NAME} MATCHES "QNX")
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list(APPEND CMAKE_REQUIRED_LIBRARIES -llogin)
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elseif(NOT APPLE)
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list(APPEND CMAKE_REQUIRED_LIBRARIES -lcrypt)
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endif()
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check_symbol_exists(crypt_r "crypt.h" HAVE_CRYPT_R)
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test_big_endian(IS_BIG_ENDIAN)
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check_include_file("stdatomic.h" HAVE_STDATOMIC)
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list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_POSIX_C_SOURCE=200809L)
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list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
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list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D__BSD_VISIBLE=1)
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list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
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# header and source file (adding the source directly allows for hiding its symbols)
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configure_file(${PROJECT_SOURCE_DIR}/compat/compat.h.in ${PROJECT_BINARY_DIR}/compat/compat.h @ONLY)
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include_directories(${PROJECT_BINARY_DIR}/compat)
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set(compatsrc ${PROJECT_SOURCE_DIR}/compat/compat.c)
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endmacro()
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