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# Forked from Gromacs
# - Define macro to check large file support
#
# myx_cmake_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
# HAVE__FSEEKI64
#
# 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!
include(CheckTypeSize)
macro(myx_cmake_test_large_files VARIABLE)
if(NOT DEFINED ${VARIABLE})
# On most platforms it is probably overkill to first test the flags for 64-bit off_t,
# and then separately fseeko. However, in the future we might have 128-bit filesystems
# (ZFS), so it might be dangerous to indiscriminately set e.g. _FILE_OFFSET_BITS=64.
message(STATUS "Checking for 64-bit off_t")
# First check without any special flags
try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c")
if(FILE64_OK)
message(STATUS "Checking for 64-bit off_t - present")
endif()
if(NOT FILE64_OK)
# Test with _FILE_OFFSET_BITS=64
try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c"
COMPILE_DEFINITIONS "-D_FILE_OFFSET_BITS=64")
if(FILE64_OK)
message(STATUS "Checking for 64-bit off_t - present with _FILE_OFFSET_BITS=64")
set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "64-bit off_t requires _FILE_OFFSET_BITS=64")
endif()
endif()
if(NOT FILE64_OK)
# Test with _LARGE_FILES
try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c"
COMPILE_DEFINITIONS "-D_LARGE_FILES")
if(FILE64_OK)
message(STATUS "Checking for 64-bit off_t - present with _LARGE_FILES")
set(_LARGE_FILES 1 CACHE INTERNAL "64-bit off_t requires _LARGE_FILES")
endif()
endif()
if(NOT FILE64_OK)
# Test with _LARGEFILE_SOURCE
try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestFileOffsetBits.c"
COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE")
if(FILE64_OK)
message(STATUS "Checking for 64-bit off_t - present with _LARGEFILE_SOURCE")
set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit off_t requires _LARGEFILE_SOURCE")
endif()
endif()
if(NOT FILE64_OK)
message(STATUS "Checking for 64-bit off_t - not present")
else()
# 64-bit off_t found. Now check that ftello/fseeko is available.
# Set the flags we might have determined to be required above
configure_file("${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestLargeFiles.c.in"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
message(STATUS "Checking for fseeko/ftello")
# Test if ftello/fseeko are available
try_compile(FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c")
if(FSEEKO_COMPILE_OK)
message(STATUS "Checking for fseeko/ftello - present")
endif()
if(NOT FSEEKO_COMPILE_OK)
# glibc 2.2 neds _LARGEFILE_SOURCE for fseeko (but not 64-bit off_t...)
try_compile(
FSEEKO_COMPILE_OK "${CMAKE_BINARY_DIR}"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/TestLargeFiles.c"
COMPILE_DEFINITIONS "-D_LARGEFILE_SOURCE")
if(FSEEKO_COMPILE_OK)
message(STATUS "Checking for fseeko/ftello - present with _LARGEFILE_SOURCE")
set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "64-bit fseeko requires _LARGEFILE_SOURCE")
else()
set(FILE64_OK 0)
message(STATUS "64-bit off_t present but fseeko/ftello not found!")
endif()
endif()
endif()
# cmake-lint: disable=C0103
if(NOT FILE64_OK)
# now check for Windows stuff
try_compile(FILE64_OK "${CMAKE_BINARY_DIR}" "${MYX_CMAKE_FUNCTIONS_DIR}/largefiles/TestWindowsFSeek.c")
if(FILE64_OK)
message(STATUS "Checking for 64-bit off_t - present with _fseeki64")
set(HAVE__FSEEKI64 1 CACHE INTERNAL "64-bit off_t requires _fseeki64")
endif()
endif()
if(FSEEKO_COMPILE_OK)
set(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
set(HAVE_FSEEKO 1 CACHE INTERNAL "64bit fseeko is available" FORCE)
elseif(HAVE__FSEEKI64)
set(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
set(HAVE__FSEEKI64 1 CACHE INTERNAL "Windows 64-bit fseek" FORCE)
else()
check_type_size("long int" SIZEOF_LONG_INT)
if(SIZEOF_LONG_INT EQUAL 8) #standard fseek is OK for 64bit
set(${VARIABLE} 1 CACHE INTERNAL "Result of test for large file support" FORCE)
else()
message(FATAL_ERROR "Checking for 64bit file support failed.")
endif()
endif()
endif()
endmacro(myx_cmake_test_large_files VARIABLE)