http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59749
Bug ID: 59749 Summary: unused warning not emited for unused static struct unles -save-temps is used Product: gcc Version: 4.8.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: martin at netbsd dot org Created attachment 31793 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31793&action=edit original source file exhibiting the problem I have a program (for the atf testing framework) that is supposed to warn about an unused variable and (due to -Werror) fail compilation. This works fine with gcc 4.5.4. But with 4.8.2 I get: $ /usr/pkg/gcc48/bin/cc -O2 -c -Wall -Werror /usr/tests/atf/atf-c/unused_test.c $ The code (after macro expansion) declares a struct and initialize it: static atfu_this_is_unused_tc_pack = { .m_ident = .... }; and there is no reference to this struct anywhere in the file. Interestingly when preparing for this ticket I did: $ /usr/pkg/gcc48/bin/cc -O2 -save-temps -c -Wall -Werror /usr/tests/atf/atf-c/unused_test.c /usr/tests/atf/atf-c/unused_test.c:41:123: error: 'atfu_this_is_unused_tc' defined but not used [-Werror=unused-variable] ATF_TC(this_is_unused); ^ cc1: all warnings being treated as errors $ /usr/pkg/gcc48/bin/cc -v Using built-in specs. COLLECT_GCC=/usr/pkg/gcc48/bin/cc COLLECT_LTO_WRAPPER=/usr/pkg/gcc48/libexec/gcc/sparc64--netbsd/4.8.2/lto-wrapper Target: sparc64--netbsd Configured with: ../gcc-4.8.2/configure --enable-languages='c c++' --enable-shared --enable-long-long --with-local-prefix=/usr/pkg/gcc48 --enable-libssp --enable-threads=posix --with-boot-ldflags='-static-libstdc++ -static-libgcc -Wl,-R/usr/pkg/lib ' --with-gnu-ld --with-ld=/usr/bin/ld --with-gnu-as --with-as=/usr/bin/as --disable-nls --with-gmp=/usr/pkg --with-mpc=/usr/pkg --with-mpfr=/usr/pkg --enable-__cxa_atexit --with-gxx-include-dir=/usr/pkg/gcc48/include/c++/ --prefix=/usr/pkg/gcc48 --build=sparc64--netbsd --host=sparc64--netbsd --infodir=/usr/pkg/gcc48/info --mandir=/usr/pkg/gcc48/man Thread model: posix gcc version 4.8.2 (GCC)