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# This file was copied from the KActivities git repository and authored
# by Ivan Cukic. All credits go to him.
# Macro that tests and returns whether a C++ feature is present in the
# current compiler
set(CXX_CHECK_FEATURE_MODULE_DIR "${CMAKE_SOURCE_DIR}/cmake/modules")
set(CXX_FEATURES_SUPPORTED "")
set(CXX_FEATURES_UNSUPPORTED "")
macro(CXX_PERFORM_TEST TEST_SOURCE_FILE TEST_TEST_BINARY_DIR EXPECTED_RESULT RESULT COMPILE_DEFINITIONS)
try_run(
RUN_RESULT_VAR COMPILE_RESULT_VAR
"${TEST_BINARY_DIR}" "${TEST_SOURCE_FILE}"
COMPILE_DEFINITIONS "${COMPILE_DEFINITIONS}"
COMPILE_OUTPUT_VARIABLE COMPILE_OUT
RUN_OUTPUT_VARIABLE RUN_OUT
)
set(RESULT_VAR FALSE)
if (COMPILE_RESULT_VAR AND NOT RUN_RESULT_VAR)
set(RESULT_VAR TRUE)
endif (COMPILE_RESULT_VAR AND NOT RUN_RESULT_VAR)
if (NOT ("${RESULT_VAR}" STREQUAL "${EXPECTED_RESULT}"))
# message ("Got ${RESULT_VAR} as a result, but ${EXPECTED_RESULT} expected")
if (NOT ${COMPILE_RESULT_VAR})
# message("------ compilation output ------")
# message("${COMPILE_OUT}")
endif (NOT ${COMPILE_RESULT_VAR})
if (${RUN_RESULT_VAR})
# message("---------- run output ----------")
# message("${RUN_OUT}")
# message("Process returned: ${RUN_RESULT_VAR}")
endif (${RUN_RESULT_VAR})
# message("--------------------------------")
set (${RESULT} FALSE)
else ()
set (${RESULT} TRUE)
endif ()
endmacro(CXX_PERFORM_TEST TEST_SOURCE EXPECTED_RESULT RESULT)
macro(CXX_CHECK_FEATURE CXX_VERSION FEATURE_NAME FEATURE_NUMBER RESULT_VAR COMPILE_DEFINITIONS)
# Testing whether we have previously set the variable
if(NOT DEFINED ${RESULT_VAR})
set(TEST_BINARY_DIR
"${CMAKE_CURRENT_BINARY_DIR}/cxx-check-feature/cxx_${FEATURE_NUMBER}"
)
set(TEST_SOURCE_BASE
"${CXX_CHECK_FEATURE_MODULE_DIR}/${CXX_VERSION}-test-${FEATURE_NAME}-${FEATURE_NUMBER}"
)
set(TEST_SOURCE_FILE "${TEST_SOURCE_BASE}.cpp")
set(FAILTEST_SOURCE_FILE "${TEST_SOURCE_BASE}-fail.cpp")
set(FEATURE_NAME
"'${FEATURE_NAME}' (${CXX_VERSION} N${FEATURE_NUMBER})"
)
message(STATUS "Checking C++ support for ${FEATURE_NAME}")
string (COMPARE EQUAL "${CMAKE_CXX_COMPILER_ID}" "Clang" CMAKE_COMPILER_IS_CLANG)
string (COMPARE EQUAL "${CMAKE_CXX_COMPILER_ID}" "GNU" CMAKE_COMPILER_IS_GCC)
set (ADD_COMPILE_DEFINITIONS "")
if (EXISTS ${TEST_SOURCE_FILE})
CXX_PERFORM_TEST(${TEST_SOURCE_FILE} ${TEST_BINARY_DIR} TRUE ${RESULT_VAR} "${COMPILE_DEFINITIONS} ${ADD_COMPILE_DEFINITIONS}")
endif ()
if (${RESULT_VAR} AND EXISTS ${FAILTEST_SOURCE_FILE})
CXX_PERFORM_TEST(${FAILTEST_SOURCE_FILE} ${TEST_BINARY_DIR} FALSE ${RESULT_VAR} "${COMPILE_DEFINITIONS} ${ADD_COMPILE_DEFINITIONS}")
endif ()
if (${RESULT_VAR})
message(STATUS "Checking C++ support for ${FEATURE_NAME} -- works")
set (CXX_FEATURES_SUPPORTED
"${CXX_FEATURES_SUPPORTED} ${FEATURE_NAME} (${FEATURE_NUMBER}),"
)
else ()
message(STATUS "Checking C++ support for ${FEATURE_NAME} -- not supported")
set (CXX_FEATURES_UNSUPPORTED
"${CXX_FEATURES_UNSUPPORTED} ${FEATURE_NAME} (${FEATURE_NUMBER}),"
)
endif ()
# This would break the feature reporting on second call of cmake
# TODO: Fix?
# set(${RESULT_VAR} ${${RESULT_VAR}} CACHE INTERNAL "C++ support for ${FEATURE_NAME}")
endif(NOT DEFINED ${RESULT_VAR})
endmacro(CXX_CHECK_FEATURE)
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