mirror of
https://github.com/transmission/transmission
synced 2024-12-24 00:34:04 +00:00
a2037bdbbd
There're too many functions and types to consider, and benefits of not using LFS macros aren't that big (I was thinking of using fts(3) but that may not happen soon or at all).
33 lines
1.4 KiB
CMake
33 lines
1.4 KiB
CMake
# 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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