75ca710370
Apparently, more and more librt functionality are being moved to glibc these days, e.g., clock_gettime, clock_getres, clock_settime, clock_getcpuclockid, clock_nanosleep. As Thiago mentioned, in face, all librt functions are moving into glibc, but unlike the clock_* functions that I can see are ported from 2.17+, I cannot find out when and what functions are already ported. So, here, I added a second test which tries to explicitly look for shm_* functions, if they are there, as well as the clock_* function, then we are more confident that we actually have a useful the libRt in the system. Also, making the FEATURE_posix_SHM depends on UNIX. Pick-to: 6.5 Fixes: QTBUG-111049 Change-Id: I08b7f4656ecd9313b552fb05ca7096f5b987b95a Reviewed-by: Alexey Edelev <alexey.edelev@qt.io> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
58 lines
1.3 KiB
CMake
58 lines
1.3 KiB
CMake
# Copyright (C) 2022 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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# We can't create the same interface imported target multiple times, CMake will complain if we do
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# that. This can happen if the find_package call is done in multiple different subdirectories.
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if(TARGET WrapRt::WrapRt)
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set(WrapRt_FOUND ON)
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return()
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endif()
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set(WrapRt_FOUND OFF)
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include(CheckCXXSourceCompiles)
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include(CMakePushCheckState)
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find_library(LIBRT rt)
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cmake_push_check_state()
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if(LIBRT)
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list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBRT}")
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endif()
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check_cxx_source_compiles("
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#include <time.h>
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#include <unistd.h>
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int main(int, char **) {
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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return 0;
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}
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" HAVE_GETTIME)
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check_cxx_source_compiles("
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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int main(int, char **) {
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shm_open(\"test\", O_RDWR | O_CREAT | O_EXCL, 0666);
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shm_unlink(\"test\");
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return 0;
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}
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" HAVE_SHM_OPEN_SHM_UNLINK)
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cmake_pop_check_state()
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if(HAVE_GETTIME OR HAVE_SHM_OPEN_SHM_UNLINK)
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set(WrapRt_FOUND ON)
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add_library(WrapRt::WrapRt INTERFACE IMPORTED)
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if (LIBRT)
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target_link_libraries(WrapRt::WrapRt INTERFACE "${LIBRT}")
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endif()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(WrapRt DEFAULT_MSG WrapRt_FOUND)
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