34 lines
1.4 KiB
CMake
34 lines
1.4 KiB
CMake
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# Based on AC_SYS_LARGEFILE
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if(NOT DEFINED NO_LFS_MACROS_REQUIRED)
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include(CheckCSourceCompiles)
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# Check that off_t can represent 2**63 - 1 correctly.
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# We can't simply define LARGE_OFF_T to be 9223372036854775807,
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# since some C++ compilers masquerading as C compilers
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# incorrectly reject 9223372036854775807.
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set(LFS_TEST_PROGRAM "
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#include <sys/types.h>
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1];
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int main() { return 0; }
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")
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check_c_source_compiles("${LFS_TEST_PROGRAM}" NO_LFS_MACROS_REQUIRED)
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if(NOT NO_LFS_MACROS_REQUIRED)
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if(NOT DEFINED FILE_OFFSET_BITS_LFS_MACRO_REQUIRED)
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check_c_source_compiles("#define _FILE_OFFSET_BITS 64 ${LFS_TEST_PROGRAM}" FILE_OFFSET_BITS_LFS_MACRO_REQUIRED)
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if(FILE_OFFSET_BITS_LFS_MACRO_REQUIRED)
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add_definitions(-D_FILE_OFFSET_BITS=64)
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elseif(NOT DEFINED LARGE_FILES_LFS_MACRO_REQUIRED)
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check_c_source_compiles("#define _LARGE_FILES 1 ${LFS_TEST_PROGRAM}" LARGE_FILES_LFS_MACRO_REQUIRED)
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if(LARGE_FILES_LFS_MACRO_REQUIRED)
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add_definitions(-D_LARGE_FILES=1)
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endif()
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endif()
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endif()
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endif()
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unset(LFS_TEST_PROGRAM)
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endif()
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