http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59574
Bug ID: 59574 Summary: Bad -Wattributes: ignoring attributes applied after definition Product: gcc Version: 4.8.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: jed at 59A2 dot org Created attachment 31499 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31499&action=edit Test case. Works with gcc if renamed to "unused.c" g++ misinterprets the attribute tag in Type x,__attribute((unused)) y; when Type is a struct or union. gcc interprets this correctly (rename to "unused.c", as does clang++. unused.cc: In function ‘MyInt bad_Wattributes()’: unused.cc:11:40: warning: ignoring attributes applied to ‘MyInt’ after definition [-Wattributes] struct MyInt x,__attribute((unused)) y; ^ Verbose output below: $ g++ -v -save-temps -c -Wall -Wextra unused.cc Using built-in specs. COLLECT_GCC=g++ Target: x86_64-unknown-linux-gnu Configured with: /build/gcc-multilib/src/gcc-4.8.2/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared --enable-threads=posix --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-cloog-backend=isl --disable-cloog-version-check --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-multilib --disable-werror --enable-checking=release Thread model: posix gcc version 4.8.2 (GCC) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-Wall' '-Wextra' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/cc1plus -E -quiet -v -D_GNU_SOURCE unused.cc -mtune=generic -march=x86-64 -Wall -Wextra -fpch-preprocess -o unused.ii ignoring nonexistent directory "/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/../../../../x86_64-unknown-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/../../../../include/c++/4.8.2 /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/../../../../include/c++/4.8.2/x86_64-unknown-linux-gnu /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/../../../../include/c++/4.8.2/backward /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/include /usr/local/include /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/include-fixed /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-Wall' '-Wextra' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/cc1plus -fpreprocessed unused.ii -quiet -dumpbase unused.cc -mtune=generic -march=x86-64 -auxbase unused -Wall -Wextra -version -o unused.s GNU C++ (GCC) version 4.8.2 (x86_64-unknown-linux-gnu) compiled by GNU C version 4.8.2, GMP version 5.1.3, MPFR version 3.1.2-p5, MPC version 1.0.1 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C++ (GCC) version 4.8.2 (x86_64-unknown-linux-gnu) compiled by GNU C version 4.8.2, GMP version 5.1.3, MPFR version 3.1.2-p5, MPC version 1.0.1 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: ab71b98845e83cf5a6c15196f260f6ae unused.cc: In function ‘MyInt bad_Wattributes()’: unused.cc:11:40: warning: ignoring attributes applied to ‘MyInt’ after definition [-Wattributes] struct MyInt x,__attribute((unused)) y; ^ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-Wall' '-Wextra' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v --64 -o unused.o unused.s GNU assembler version 2.24 (x86_64-unknown-linux-gnu) using BFD version (GNU Binutils) 2.24 COMPILER_PATH=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/:/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/:/usr/lib/gcc/x86_64-unknown-linux-gnu/:/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/:/usr/lib/gcc/x86_64-unknown-linux-gnu/ LIBRARY_PATH=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/:/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-Wall' '-Wextra' '-shared-libgcc' '-mtune=generic' '-march=x86-64'