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Run-time check for floating point byte order rather than CMake check.

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It's safer not to use an unofficial CMake script.
This commit is contained in:
Tsuda Kageyu
2015-07-31 12:46:43 +09:00
parent 13dab99af0
commit 44d9f2bf25
6 changed files with 17 additions and 122 deletions
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61
cmake/modules/TestFloatFormat.cmake
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@ -1,61 +0,0 @@
# Returns 1 if IEEE754 little-endian, 2 if IEEE754 big-endian, otherwise 0.
MACRO(TEST_FLOAT_FORMAT FP_IEEE754)
IF(NOT FP_IEEE754)
TRY_COMPILE(HAVE_FLOAT_FORMAT_BIN
"${CMAKE_BINARY_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/cmake/TestFloatFormat.c"
COPY_FILE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestFloatFormat.bin")
SET(FP_IEEE754 0)
IF(HAVE_FLOAT_FORMAT_BIN)
# dont match first/last letter because of string rounding errors :-)
FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestFloatFormat.bin"
DOUBLE_IEEE754_LE LIMIT_COUNT 1 REGEX "TAGLIB")
FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestFloatFormat.bin"
DOUBLE_IEEE754_BE LIMIT_COUNT 1 REGEX "BILGAT")
FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestFloatFormat.bin"
FLOAT_IEEE754_LE LIMIT_COUNT 1 REGEX "TL")
FILE(STRINGS "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestFloatFormat.bin"
FLOAT_IEEE754_BE LIMIT_COUNT 1 REGEX "LT")
IF(DOUBLE_IEEE754_LE AND FLOAT_IEEE754_LE)
SET(FP_IEEE754_LE 1)
ENDIF()
IF(DOUBLE_IEEE754_BE AND FLOAT_IEEE754_BE)
SET(FP_IEEE754_BE 1)
ENDIF()
# OS X Universal binaries will contain both strings, set it to the host
IF(FP_IEEE754_LE AND FP_IEEE754_BE)
IF(CMAKE_SYSTEM_PROCESSOR MATCHES powerpc)
SET(FP_IEEE754_LE FALSE)
SET(FP_IEEE754_BE TRUE)
ELSE()
SET(FP_IEEE754_LE TRUE)
SET(FP_IEEE754_BE FALSE)
ENDIF()
ENDIF()
IF(FP_IEEE754_LE)
SET(FP_IEEE754 1)
ELSEIF(FP_IEEE754_BE)
SET(FP_IEEE754 2)
ENDIF()
ENDIF()
# just some informational output for the user
IF(FP_IEEE754_LE)
MESSAGE(STATUS "Checking the floating point format - IEEE754 (LittleEndian)")
ELSEIF(FP_IEEE754_BE)
MESSAGE(STATUS "Checking the floating point format - IEEE754 (BigEndian)")
ELSE()
MESSAGE(STATUS "Checking the floating point format - Not IEEE754 or failed to detect.")
ENDIF()
SET(FP_IEEE754 "${${FP_IEEE754}}" CACHE INTERNAL "Result of TEST_FLOAT_FORMAT" FORCE)
ENDIF()
ENDMACRO(TEST_FLOAT_FORMAT FP_IEEE754)