[Bug middle-end/71719] New: [7 Regression] invalid set-but-not-used warning with vectors

zsojka at seznam dot cz gcc-bugzilla@gcc.gnu.org
Thu Jun 30 20:07:00 GMT 2016


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)


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