https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93643
--- Comment #3 from Iñaki Ucar <iucar at fedoraproject dot org> --- I got no backtrace, just the output shown in my first comment, at least with the gcc version included in Fedora Rawhide. I've just attached the test.ii file too. With -v: $ g++ -v -save-temps test.cpp Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix Supported LTO compression algorithms: zlib gcc version 10.0.1 20200130 (Red Hat 10.0.1-0.7) (GCC) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/libexec/gcc/x86_64-redhat-linux/10/cc1plus -E -quiet -v -D_GNU_SOURCE test.cpp -mtune=generic -march=x86-64 -fpch-preprocess -o test.ii ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/10/include-fixed" ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/10/../../../../x86_64-redhat-linux/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-redhat-linux/10/../../../../include/c++/10 /usr/lib/gcc/x86_64-redhat-linux/10/../../../../include/c++/10/x86_64-redhat-linux /usr/lib/gcc/x86_64-redhat-linux/10/../../../../include/c++/10/backward /usr/lib/gcc/x86_64-redhat-linux/10/include /usr/local/include /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/libexec/gcc/x86_64-redhat-linux/10/cc1plus -fpreprocessed test.ii -quiet -dumpbase test.cpp -mtune=generic -march=x86-64 -auxbase test -version -o test.s GNU C++14 (GCC) version 10.0.1 20200130 (Red Hat 10.0.1-0.7) (x86_64-redhat-linux) compiled by GNU C version 10.0.1 20200130 (Red Hat 10.0.1-0.7), GMP version 6.1.2, MPFR version 4.0.2-p1, MPC version 1.1.0, isl version isl-0.16.1-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C++14 (GCC) version 10.0.1 20200130 (Red Hat 10.0.1-0.7) (x86_64-redhat-linux) compiled by GNU C version 10.0.1 20200130 (Red Hat 10.0.1-0.7), GMP version 6.1.2, MPFR version 4.0.2-p1, MPC version 1.1.0, isl version isl-0.16.1-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 80355902cebbb142e87c9570dbf4f6a2 COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v --64 -o test.o test.s GNU assembler version 2.34 (x86_64-redhat-linux) using BFD version version 2.34-1.fc32 test.s: Assembler messages: test.s:41: Error: symbol `f' is already defined
