Hi everyone,
I hit this warning yesterday after a fresh pull from the repo on a big
endian 32-bit mips compiling with gentoo's
mips-gentoo-linux-uclibc-4.6.2. It was repeat many times.
CC libc/pwd_grp/getpwnam.os
In file included from ./include/bits/libc-lock.h:36:0,
from ./include/bits/stdio-lock.h:23,
from ./include/bits/uClibc_mutex.h:71,
from ./include/bits/uClibc_stdio.h:119,
from ./include/stdio.h:72,
from libc/pwd_grp/pwd_grp.c:23,
from libc/pwd_grp/getpwnam.c:8:
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h: In
function '__lll_cond_lock':
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:194:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:194:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:194:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h: In
function '__lll_timedlock':
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:213:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:213:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:213:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h: In
function '__lll_robust_timedlock':
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:226:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:226:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
./libpthread/nptl/sysdeps/unix/sysv/linux/mips/lowlevellock.h:226:1:
warning: variable '__prev' set but not used [-Wunused-but-set-variable]
I traced it back through the macros
atomic_compare_and_exchange_bool_acq
-> __atomic_bool_bysize
-> __arch_compare_and_exchange_bool_32_int
-> { __typeof (*mem) __prev; int __cmp; \
__arch_compare_and_exchange_xxx_32_int(mem, new, old, rel,
acq); \
!__cmp; }
where __arch_compare_and_exchange_xxx_32_int contains the mips asm that
sets __prev. I see why __prev is unused but set, but I'm not sure how
to fix this properly. A hack that works is to comment out
atomic_compare_and_exchange_bool_acq in
libc/sysdeps/linux/mips/bits/atomic.h = include/bits/atomic.h and fall
back on the #define atomic_compare_and_exchange_bool_acq in
include/atomic.h, but that doesn't seem like the right way.
Its only a warning and the resulting libs are good.
--
Anthony G. Basile, Ph. D.
Chair of Information Technology
D'Youville College
Buffalo, NY 14201
(716) 829-8197
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