gcc complains about an unused variable while ompiling the kernel tree 2.6.17-rc3-git14 :
... CC mm/vmscan.o mm/vmscan.c: In function `remove_mapping': mm/vmscan.c:382: warning: unused variable `swap' CC mm/prio_tree.o CC mm/util.o ... But the variable seems to be used : ... if (PageSwapCache(page)) { swp_entry_t swap = { .val = page_private(page) }; __delete_from_swap_cache(page); write_unlock_irq(&mapping->tree_lock); swap_free(swap); <----------------------------------- ... The compiler version is: $> gcc -v Reading specs from /usr/lib/gcc/i686-pc-linux-gnu/3.4.5/specs Configured with: /var/tmp/portage/gcc-3.4.5-r1/work/gcc-3.4.5/configure --prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/3.4.5 --includedir=/usr/lib/gcc/i686-pc-linux-gnu/3.4.5/include --datadir=/usr/share/gcc-data/i686-pc-linux-gnu/3.4.5 --mandir=/usr/share/gcc-data/i686-pc-linux-gnu/3.4.5/man --infodir=/usr/share/gcc-data/i686-pc-linux-gnu/3.4.5/info --with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/3.4.5/include/g++-v3 --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec --enable-nls --without-included-gettext --with-system-zlib --disable-checking --disable-werror --disable-libunwind-exceptions --disable-multilib --disable-libgcj --enable-languages=c,c++,f77 --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu Thread model: posix gcc version 3.4.5 (Gentoo 3.4.5-r1, ssp-3.4.5-1.0, pie-8.7.9) And this the host system: $> uname -a Linux n22 2.6.16-gentoo-r6 #3 Fri May 5 11:59:58 CEST 2006 i686 Intel(R) Pentium(R) M processor 1700MHz GNU/Linux The kernel config can be found here http://bugzilla.kernel.org/attachment.cgi?id=8037&action=view -- Summary: wrong warning about an unused variable Product: gcc Version: 3.4.5 Status: UNCONFIRMED Severity: minor Priority: P3 Component: preprocessor AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: toralf dot foerster at gmx dot de http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27509