https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71719
Bug ID: 71719 Summary: [7 Regression] invalid set-but-not-used warning with vectors Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Target Milestone: --- Created attachment 38806 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38806&action=edit reduced testcase Compiler output: $ gcc -Wall -W unused.c -c unused.c: In function 'foo': unused.c:6:8: warning: parameter 'v' set but not used [-Wunused-but-set-parameter] foo (V v) ^ The variable is used (even all its members). Happens at any -O* level. $ gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-237869-checking-yes-rtl-df-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-237869-checking-yes-rtl-df-nographite-amd64 Thread model: posix gcc version 7.0.0 20160630 (experimental) (GCC)