https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90196
Bug ID: 90196 Summary: std:: types unused without warnings but simple type not affected Product: gcc Version: 9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: maxim.prohorenko at gmail dot com Target Milestone: --- #include <vector> #include <bitset> int main() { std::bitset<20> std_unused_bitset; std::vector<int> std_unused_vector; double unused_double = 0; int unused_int = 0; } Start Using built-in specs. COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++ COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head --enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl --enable-checking=release --disable-nls --enable-lto LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32 Thread model: posix gcc version 9.0.1 20190419 (experimental) (GCC) COLLECT_GCC_OPTIONS='-o' 'prog.exe' '-I' '/opt/wandbox/boost-sml/include' '-I' '/opt/wandbox/boost-di/include' '-I' '/opt/wandbox/range-v3/include' '-I' '/opt/wandbox/nlohmann-json/src' '-I' '/opt/wandbox/cmcstl2/include' '-I' '/opt/wandbox/te/include' '-Wpedantic' '-Wextra' '-v' '-std=gnu++2a' '-Wall' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/cc1plus -quiet -v -I /opt/wandbox/boost-sml/include -I /opt/wandbox/boost-di/include -I /opt/wandbox/range-v3/include -I /opt/wandbox/nlohmann-json/src -I /opt/wandbox/cmcstl2/include -I /opt/wandbox/te/include -imultiarch x86_64-linux-gnu -D_GNU_SOURCE prog.cc -quiet -dumpbase prog.cc -mtune=generic -march=x86-64 -auxbase prog -Wpedantic -Wextra -Wall -std=gnu++2a -version -o /tmp/ccMrqaZh.s GNU C++17 (GCC) version 9.0.1 20190419 (experimental) (x86_64-pc-linux-gnu) compiled by GNU C version 9.0.1 20190419 (experimental), GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version none GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../../x86_64-pc-linux-gnu/include" ignoring nonexistent directory "/opt/wandbox/nlohmann-json/src" #include "..." search starts here: #include <...> search starts here: /opt/wandbox/boost-sml/include /opt/wandbox/boost-di/include /opt/wandbox/range-v3/include /opt/wandbox/cmcstl2/include /opt/wandbox/te/include /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../../include/c++/9.0.1 /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../../include/c++/9.0.1/x86_64-pc-linux-gnu /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../../include/c++/9.0.1/backward /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/include /opt/wandbox/gcc-head/include /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. GNU C++17 (GCC) version 9.0.1 20190419 (experimental) (x86_64-pc-linux-gnu) compiled by GNU C version 9.0.1 20190419 (experimental), GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version none GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 5727b3035a99e91491262c43ff2f6952 prog.cc: In function 'int main()': prog.cc:9:10: warning: unused variable 'unused_double' [-Wunused-variable] 9 | double unused_double = 0; | ^~~~~~~~~~~~~ prog.cc:10:7: warning: unused variable 'unused_int' [-Wunused-variable] 10 | int unused_int = 0; | ^~~~~~~~~~ COLLECT_GCC_OPTIONS='-o' 'prog.exe' '-I' '/opt/wandbox/boost-sml/include' '-I' '/opt/wandbox/boost-di/include' '-I' '/opt/wandbox/range-v3/include' '-I' '/opt/wandbox/nlohmann-json/src' '-I' '/opt/wandbox/cmcstl2/include' '-I' '/opt/wandbox/te/include' '-Wpedantic' '-Wextra' '-v' '-std=gnu++2a' '-Wall' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v -I /opt/wandbox/boost-sml/include -I /opt/wandbox/boost-di/include -I /opt/wandbox/range-v3/include -I /opt/wandbox/nlohmann-json/src -I /opt/wandbox/cmcstl2/include -I /opt/wandbox/te/include --64 -o /tmp/ccgTBy2z.o /tmp/ccMrqaZh.s GNU assembler version 2.26.1 (x86_64-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2.26.1 COMPILER_PATH=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/:/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/:/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/:/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/:/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/ LIBRARY_PATH=/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/:/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-o' 'prog.exe' '-I' '/opt/wandbox/boost-sml/include' '-I' '/opt/wandbox/boost-di/include' '-I' '/opt/wandbox/range-v3/include' '-I' '/opt/wandbox/nlohmann-json/src' '-I' '/opt/wandbox/cmcstl2/include' '-I' '/opt/wandbox/te/include' '-Wpedantic' '-Wextra' '-v' '-std=gnu++2a' '-Wall' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/collect2 -plugin /opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/liblto_plugin.so -plugin-opt=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/9.0.1/lto-wrapper -plugin-opt=-fresolution=/tmp/cckzTO8R.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o prog.exe /usr/lib/x86_64-linux-gnu/crt1.o /usr/lib/x86_64-linux-gnu/crti.o /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/crtbegin.o -L/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1 -L/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/../../.. -rpath /opt/wandbox/gcc-head/lib64 -lpthread /tmp/ccgTBy2z.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /opt/wandbox/gcc-head/lib/gcc/x86_64-pc-linux-gnu/9.0.1/crtend.o /usr/lib/x86_64-linux-gnu/crtn.o COLLECT_GCC_OPTIONS='-o' 'prog.exe' '-I' '/opt/wandbox/boost-sml/include' '-I' '/opt/wandbox/boost-di/include' '-I' '/opt/wandbox/range-v3/include' '-I' '/opt/wandbox/nlohmann-json/src' '-I' '/opt/wandbox/cmcstl2/include' '-I' '/opt/wandbox/te/include' '-Wpedantic' '-Wextra' '-v' '-std=gnu++2a' '-Wall' '-shared-libgcc' '-mtune=generic' '-march=x86-64' 0 Finish No Wrap