https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81408
--- Comment #2 from Julian Andres Klode <j...@jak-linux.org> --- Build log with -v: Using built-in specs. COLLECT_GCC=/usr/bin/g++-7 OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 7.1.0-9' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 7.1.0 (Debian 7.1.0-9) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-O2' '-Wunsafe-loop-optimizations' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/7/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE a.cc -mtune=generic -march=x86-64 -Wunsafe-loop-optimizations -O2 -fpch-preprocess -o a.ii ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/7" ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/../../../../x86_64-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/include/c++/7 /usr/include/x86_64-linux-gnu/c++/7 /usr/include/c++/7/backward /usr/lib/gcc/x86_64-linux-gnu/7/include /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-O2' '-Wunsafe-loop-optimizations' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/7/cc1plus -fpreprocessed a.ii -quiet -dumpbase a.cc -mtune=generic -march=x86-64 -auxbase a -O2 -Wunsafe-loop-optimizations -version -o a.s GNU C++14 (Debian 7.1.0-9) version 7.1.0 (x86_64-linux-gnu) compiled by GNU C version 7.1.0, GMP version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version isl-0.18-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C++14 (Debian 7.1.0-9) version 7.1.0 (x86_64-linux-gnu) compiled by GNU C version 7.1.0, GMP version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version isl-0.18-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 3681302eda59faba4e53a905eca4bf72 a.cc: In function ‘void ShowHelpListCommands(const std::vector<aptDispatchWithHelp>&)’: a.cc:11:24: warning: missed loop optimization, the loop counter may overflow [-Wunsafe-loop-optimizations] for (auto const &c: Cmds) ^~~~ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-O2' '-Wunsafe-loop-optimizations' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v --64 -o a.o a.s GNU assembler version 2.28 (x86_64-linux-gnu) using BFD version (GNU Binutils for Debian) 2.28 COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/ LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-O2' '-Wunsafe-loop-optimizations' '-shared-libgcc' '-mtune=generic' '-march=x86-64'