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#
# Checks whether the 22nd bit of a 32-bit quiet-NaN is 1 (1) or 0 (0). This
# distinction is needed in handling of IEEE floating point special values.
# This quantity is independent of endian-ness.
#
# VARIABLE - variable to store the result to
#
MACRO(TEST_QNANHIBIT VARIABLE LOCAL_TEST_DIR)
IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
TRY_RUN(${VARIABLE} HAVE_${VARIABLE}
${CMAKE_BINARY_DIR}
${LOCAL_TEST_DIR}/TestQnanhibit.c
OUTPUT_VARIABLE OUTPUT)
MESSAGE(STATUS "Check the value of the 22nd bit of a 32-bit quiet-NaN")
IF(HAVE_${VARIABLE})
IF(${VARIABLE} LESS 0)
MESSAGE(ERROR " A test (qnanhibit.c) necessary for NrrdIO configuration returned error code. NrrdIO may not properly handle NaN's.")
ENDIF(${VARIABLE} LESS 0)
IF(${VARIABLE})
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Value of the 22nd bit of a 32-bit quiet-NaN is 1")
MESSAGE(STATUS "Check the value of the 22nd bit of a 32-bit quiet-NaN - 1")
ELSE(${VARIABLE})
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Value of the 22nd bit of a 32-bit quiet-NaN is 0")
MESSAGE(STATUS "Check the value of the 22nd bit of a 32-bit quiet-NaN - 0")
ENDIF(${VARIABLE})
ELSE(HAVE_${VARIABLE})
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"\tFailed to compile a test (TestQnanhibit.c) necessary to configure for proper handling of IEEE floating point NaN's.\n")
MESSAGE(STATUS "Failed to compile a test (TestQnanhibit.c) necessary to configure for proper handling of IEEE floating point NaN's")
ENDIF(HAVE_${VARIABLE})
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "TestQnanhibit.c produced following output:\n${OUTPUT}\n\n")
ENDIF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
ENDMACRO(TEST_QNANHIBIT)
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