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originally the namespace-infringing "large file support" interfaces
were included as part of glibc-ABI-compat, with the intent that they
not be used for linking, since our off_t is and always has been
unconditionally 64-bit and since we usually do not aim to support
nonstandard interfaces when there is an equivalent standard interface.
unfortunately, having the symbols present and available for linking
caused configure scripts to detect them and attempt to use them
without declarations, producing all the expected ill effects that
entails.
as a result, commit 2dd8d5e1b8ba1118ff1782e96545cb8a2318592c was made
to prevent this, using macros to redirect the LFS64 names to the
standard names, conditional on _GNU_SOURCE or _LARGEFILE64_SOURCE.
however, this has turned out to be a source of further problems,
especially since g++ defines _GNU_SOURCE by default. in particular,
the presence of these names as macros breaks a lot of valid code.
this commit removes all the LFS64 symbols and replaces them with a
mechanism in the dynamic linker symbol lookup failure path to retry
with the spurious "64" removed from the symbol name. in the future,
if/when the rest of glibc-ABI-compat is moved out of libc, this can be
removed.
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mips n32 has 32-bit long, and generally uses long syscall arguments
and return values, but provides only SYS_lseek, not SYS_llseek. we
have some framework (syscall_arg_t, added for x32) to make syscall
arguments 64-bit in such a setting, but it's not clear whether this
could match the sign-extension semantics needed for 32-bit args to all
the other syscalls, and we don't have any existing mechanism to allow
the return value of syscalls to be something other than long.
instead, just provide a custom mipsn32 version of the lseek function
doing its own syscall asm with 64-bit arguments. as a result of commit
03919b26ed41c31876db41f7cee076ced4513fad, stdio will also get the new
code, fixing fseeko/ftello too.
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based on patch submitted by Jaydeep Patil, with minor changes.
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