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# Downloaded from https://panthema.net/2012/1119-eSAIS-Inducing-Suffix-and-LCP-Arrays-in-External-Memory/eSAIS-DC3-LCP-0.5.4/stxxl/misc/cmake/TestLargeFiles.cmake.html
# That project's license is Boost Software License, Version 1.0.
# - Define macro to check large file support
#
# TEST_LARGE_FILES(VARIABLE)
#
# VARIABLE will be set to true if off_t is 64 bits, and fseeko/ftello present.
# This macro will also set defines necessary enable large file support, for instance
# _LARGE_FILES
# _LARGEFILE_SOURCE
# _FILE_OFFSET_BITS 64
# HAVE_FSEEKO
#
# However, it is YOUR job to make sure these defines are set in a cmakedefine so they
# end up in a config.h file that is included in your source if necessary!
set(_test_large_files_dir "${CMAKE_CURRENT_LIST_DIR}")
MACRO(TEST_LARGE_FILES VARIABLE)
IF(NOT DEFINED ${VARIABLE})
# On most platforms it is probably overkill to first test the flags for 64-bit off_t,
# and then separately fseeko. However, in the future we might have 128-bit filesystems
# (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
MESSAGE(STATUS "Checking for 64-bit off_t")
# First check without any special flags
TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
"${_test_large_files_dir}/TestFileOffsetBits.cpp")
if(FILE64_OK)
MESSAGE(STATUS "Checking for 64-bit off_t - present")
endif(FILE64_OK)
if(NOT FILE64_OK)
# Test with _FILE_OFFSET_BITS=64
TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
"${_test_large_files_dir}/TestFileOffsetBits.cpp"
COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64" )
if(FILE64_OK)
MESSAGE(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64")
set(_FILE_OFFSET_BITS 64)
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
# Test with _LARGE_FILES
TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
"${_test_large_files_dir}/TestFileOffsetBits.cpp"
COMPILE_DEFINITIONS "-D_LARGE_FILES" )
if(FILE64_OK)
MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES")
set(_LARGE_FILES 1)
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
# Test with _LARGEFILE_SOURCE
TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
"${_test_large_files_dir}/TestFileOffsetBits.cpp"
COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
if(FILE64_OK)
MESSAGE(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE")
set(_LARGEFILE_SOURCE 1)
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
# now check for Windows stuff
TRY_COMPILE(FILE64_OK "${PROJECT_BINARY_DIR}"
"${_test_large_files_dir}/TestWindowsFSeek.cpp")
if(FILE64_OK)
MESSAGE(STATUS "Checking for 64-bit off_t - present with _fseeki64")
set(HAVE__FSEEKI64 1)
endif(FILE64_OK)
endif(NOT FILE64_OK)
if(NOT FILE64_OK)
MESSAGE(STATUS "Checking for 64-bit off_t - not present")
else(NOT FILE64_OK)
# Set the flags we might have determined to be required above
configure_file("${_test_large_files_dir}/TestLargeFiles.cpp.cmakein"
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.cpp")
MESSAGE(STATUS "Checking for fseeko/ftello")
# Test if ftello/fseeko are available
TRY_COMPILE(FSEEKO_COMPILE_OK "${PROJECT_BINARY_DIR}"
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.cpp")
if(FSEEKO_COMPILE_OK)
MESSAGE(STATUS "Checking for fseeko/ftello - present")
endif(FSEEKO_COMPILE_OK)
if(NOT FSEEKO_COMPILE_OK)
# glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...)
TRY_COMPILE(FSEEKO_COMPILE_OK "${PROJECT_BINARY_DIR}"
"${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.cpp"
COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE" )
if(FSEEKO_COMPILE_OK)
MESSAGE(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE")
set(_LARGEFILE_SOURCE 1)
endif(FSEEKO_COMPILE_OK)
endif(NOT FSEEKO_COMPILE_OK)
endif(NOT FILE64_OK)
if(FSEEKO_COMPILE_OK)
SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
set(HAVE_FSEEKO 1)
else(FSEEKO_COMPILE_OK)
if (HAVE__FSEEKI64)
SET(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
SET(HAVE__FSEEKI64 1 CACHE INTERNAL "Windows 64-bit fseek" FORCE)
else (HAVE__FSEEKI64)
MESSAGE(STATUS "Checking for fseeko/ftello - not found")
SET(${VARIABLE} 0 CACHE INTERNAL "Result of test for large file support" FORCE)
endif (HAVE__FSEEKI64)
endif(FSEEKO_COMPILE_OK)
ENDIF(NOT DEFINED ${VARIABLE})
ENDMACRO(TEST_LARGE_FILES VARIABLE)
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