38c7ae48ce
it seems like old systems need to link to librt for this function. (for newer ones it is already included in libc.)
52 lines
1.1 KiB
CMake
52 lines
1.1 KiB
CMake
# Module that makes the clock_gettime() function available
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#
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# Sets the following variables:
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# HAVE_LIBRT
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# LIBRT_LIBRARIES
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#
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# perform tests
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include(CheckCSourceCompiles)
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# first check if we need to add anything at all to be able to use
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# clock_gettime()
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CHECK_CXX_SOURCE_COMPILES("
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#include <time.h>
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int main()
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{
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timespec time1;
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clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &time1);
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};
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" HAVE_LIBRT)
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cmake_pop_check_state()
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if (HAVE_LIBRT)
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# if this worked, we're already happy
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set(LIBRT_LIBRARIES "")
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else()
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# if not, let's try the same program with linking to librt (required
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# on some systems)
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cmake_push_check_state()
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list(APPEND CMAKE_REQUIRED_LIBRARIES "rt")
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CHECK_CXX_SOURCE_COMPILES("
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#include <time.h>
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int main()
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{
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timespec time1;
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clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &time1);
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};
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" HAVE_LIBRT2)
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cmake_pop_check_state()
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set(HAVE_LIBRT "${HAVE_LIBRT2}")
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if (HAVE_LIBRT)
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set(LIBRT_LIBRARIES "rt")
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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(LibRT
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DEFAULT_MSG
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HAVE_LIBRT
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)
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