On 10 April 2012 01:46, Anthony G. Basile <bas...@opensource.dyc.edu> wrote: > 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. >
Hi, 4.6.2 has started enabling more checks and producing more warnings > 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. > would attribute used help ? cheers, Carmelo > 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 > > _______________________________________________ > uClibc mailing list > uClibc@uclibc.org > http://lists.busybox.net/mailman/listinfo/uclibc _______________________________________________ uClibc mailing list uClibc@uclibc.org http://lists.busybox.net/mailman/listinfo/uclibc