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Merge pull request #1438 from delcypher/cmake_old_glibc_librt

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[CMake] Fix #1437
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Nikolaj Bjorner 2018-01-03 08:41:15 -08:00 committed by GitHub
parent ad15b75dc4 e9be339d9d
commit 6a4f269563
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1 changed files with 40 additions and 0 deletions
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40
CMakeLists.txt
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@ -257,6 +257,46 @@ list(APPEND Z3_COMPONENT_EXTRA_INCLUDE_DIRS
"${CMAKE_BINARY_DIR}/src"
"${CMAKE_SOURCE_DIR}/src"
)
################################################################################
# Linux specific configuration
################################################################################
if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
# Try to detect if it is necessary to link against librt.
# Note that glibc < 2.17 required librt to be linked to use clock_gettime()
# and friends.
set(CLOCK_GETTIME_REQUIRES_LIBRT_TEST_CODE
"
#include <time.h>
int main() {
timespec res;
int result = clock_gettime(CLOCK_REALTIME, &res);
return result == 0;
}
"
)
check_cxx_source_compiles(
"${CLOCK_GETTIME_REQUIRES_LIBRT_TEST_CODE}"
CLOCK_GETTIME_NO_REQUIRE_LIBRT
)
if (NOT CLOCK_GETTIME_NO_REQUIRE_LIBRT)
# Try again with librt
message(STATUS "Failed to link against clock_gettime(), trying with librt")
set(CMAKE_REQUIRED_LIBRARIES_OLD "${CMAKE_REQUIRED_LIBRARIES}")
set(CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES} rt")
check_cxx_source_compiles(
"${CLOCK_GETTIME_REQUIRES_LIBRT_TEST_CODE}"
CLOCK_GETTIME_REQUIRES_LIBRT
)
set(CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES_OLD}")
if (CLOCK_GETTIME_REQUIRES_LIBRT)
list(APPEND Z3_DEPENDENT_LIBS "rt")
else()
message(FATAL_ERROR "Failed to link against clock_gettime()")
endif()
endif()
endif()
################################################################################
# GNU multiple precision library support
################################################################################