50 lines
1.6 KiB
CMake
50 lines
1.6 KiB
CMake
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#
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# tuklib_large_file_support.cmake
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#
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# If off_t is less than 64 bits by default and -D_FILE_OFFSET_BITS=64
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# makes off_t become 64-bit, the CMake option LARGE_FILE_SUPPORT is
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# provided (ON by default) and -D_FILE_OFFSET_BITS=64 is added to
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# the compile definitions if LARGE_FILE_SUPPORT is ON.
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#
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# Author: Lasse Collin
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#
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include("${CMAKE_CURRENT_LIST_DIR}/tuklib_common.cmake")
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include(CheckCSourceCompiles)
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function(tuklib_large_file_support TARGET_OR_ALL)
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# MSVC must be handled specially in the C code.
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if(MSVC)
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return()
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endif()
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set(TUKLIB_LARGE_FILE_SUPPORT_TEST
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"#include <sys/types.h>
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int foo[sizeof(off_t) >= 8 ? 1 : -1];
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int main(void) { return 0; }")
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check_c_source_compiles("${TUKLIB_LARGE_FILE_SUPPORT_TEST}"
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TUKLIB_LARGE_FILE_SUPPORT_BY_DEFAULT)
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if(NOT TUKLIB_LARGE_FILE_SUPPORT_BY_DEFAULT)
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cmake_push_check_state()
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# This needs -D.
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list(APPEND CMAKE_REQUIRED_DEFINITIONS "-D_FILE_OFFSET_BITS=64")
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check_c_source_compiles("${TUKLIB_LARGE_FILE_SUPPORT_TEST}"
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TUKLIB_LARGE_FILE_SUPPORT_WITH_FOB64)
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cmake_pop_check_state()
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endif()
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if(TUKLIB_LARGE_FILE_SUPPORT_WITH_FOB64)
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# Show the option only when _FILE_OFFSET_BITS=64 affects sizeof(off_t).
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option(LARGE_FILE_SUPPORT
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"Use -D_FILE_OFFSET_BITS=64 to support files larger than 2 GiB."
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ON)
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if(LARGE_FILE_SUPPORT)
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# This must not use -D.
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tuklib_add_definitions("${TARGET_OR_ALL}" "_FILE_OFFSET_BITS=64")
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endif()
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endif()
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endfunction()
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