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include(CheckIncludeFile)
include(CheckTypeSize)
include(CMakePushCheckState)
macro(TEST_LARGE_FILES VARIABLE)
if(NOT DEFINED ${VARIABLE})
cmake_push_check_state()
message(STATUS "Checking large files support...")
check_include_file(sys/types.h HAVE_SYS_TYPES_H)
check_include_file(stdint.h HAVE_STDINT_H)
check_include_file(stddef.h HAVE_STDDEF_H)
message(STATUS "Checking size of off_t without any definitions:")
check_type_size(off_t SIZEOF_OFF_T)
message(STATUS "Checking of off_t without any definitions: ${SIZEOF_OFF_T}")
if(SIZEOF_OFF_T EQUAL 8)
set(LARGE_FILES_DEFINITIONS "" CACHE INTERNAL "64-bit off_t required definitions")
set(FILE64 TRUE)
else()
unset(HAVE_SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T_CODE CACHE)
cmake_pop_check_state()
set(FILE64 FALSE)
endif()
if(NOT FILE64)
set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64)
message(STATUS "Checking size of off_t with _FILE_OFFSET_BITS=64:")
check_type_size(off_t SIZEOF_OFF_T)
message(STATUS "Checking size of off_t with _FILE_OFFSET_BITS=64: ${SIZEOF_OFF_T}")
if(SIZEOF_OFF_T EQUAL 8)
set(_FILE_OFFSET_BITS 64 CACHE INTERNAL "")
set(_FILE_OFFSET_BITS_CODE "#define _FILE_OFFSET_BITS 64" CACHE INTERNAL "")
set(LARGE_FILES_DEFINITIONS ${LARGE_FILES_DEFINITIONS} "-D_FILE_OFFSET_BITS=64" CACHE INTERNAL "64-bit off_t required definitions")
set(FILE64 TRUE)
else()
set(_FILE_OFFSET_BITS_CODE "" CACHE INTERNAL "")
unset(HAVE_SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T_CODE CACHE)
cmake_pop_check_state()
set(FILE64 FALSE)
endif()
endif()
if(NOT FILE64)
set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_LARGE_FILES)
message(STATUS "Checking size of off_t with _LARGE_FILES:")
check_type_size(off_t SIZEOF_OFF_T)
message(STATUS "Checking size of off_t with _LARGE_FILES: ${SIZEOF_OFF_T}")
if(SIZEOF_OFF_T EQUAL 8)
set(_LARGE_FILES 1 CACHE INTERNAL "")
set(LARGE_FILES_DEFINITIONS ${LARGE_FILES_DEFINITIONS} "-D_LARGE_FILES" CACHE INTERNAL "64-bit off_t required definitions")
set(FILE64 TRUE)
else()
unset(HAVE_SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T_CODE CACHE)
cmake_pop_check_state()
set(FILE64 FALSE)
endif()
endif()
if(NOT FILE64)
set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_LARGEFILE_SOURCE)
unset(HAVE_SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T CACHE)
unset(SIZEOF_OFF_T_CODE CACHE)
message(STATUS "Checking size of off_t with _LARGEFILE_SOURCE:")
check_type_size(off_t SIZEOF_OFF_T)
message(STATUS "Checking size of off_t with _LARGEFILE_SOURCE: ${SIZEOF_OFF_T}")
if(SIZEOF_OFF_T EQUAL 8)
set(_LARGEFILE_SOURCE 1 CACHE INTERNAL "")
set(LARGE_FILES_DEFINITIONS ${LARGE_FILES_DEFINITIONS} "-D_LARGEFILE_SOURCE" CACHE INTERNAL "64-bit off_t required definitions")
set(FILE64 TRUE)
else()
cmake_pop_check_state()
set(FILE64 FALSE)
endif()
endif()
if(FILE64)
set(${VARIABLE} 1 CACHE INTERNAL "Result of tests for large file support" FORCE)
if(NOT SIZEOF_OFF_T_REQURED_DEFINITIONS)
message(STATUS "Result of checking large files support: supported")
else()
message(STATUS "Result of checking large files support: supported with ${LARGE_FILES_DEFINITIONS}")
message(STATUS "Add LARGE_FILES_DEFINITIONS to your compiler definitions or configure with _FILE_OFFSET_BITS,")
message(STATUS "_FILE_OFFSET_BITS_CODE, _LARGE_FILES and _LARGEFILE_SOURCE variables.")
endif()
else()
message("Result of checking large files support: not supported")
set(${VARIABLE} 0 CACHE INTERNAL "Result of test for large file support" FORCE)
endif()
endif(NOT DEFINED ${VARIABLE})
endmacro(TEST_LARGE_FILES VARIABLE)
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