https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99460
--- Comment #1 from mexon <gcc.mexon at spamgourmet dot com> --- Here's a transcript showing the platform (Ubuntu 20.10 in a virtual machine) and output of g++ -v -save-temps: $ vagrant init ubuntu/groovy64 $ vagrant up $ ssh 127.0.0.1 vagrant@ubuntu-groovy:~$ sudo apt install build-essential bison flex libgmp3-dev libmpc-dev libmpfr-dev texinfo vagrant@ubuntu-groovy:~$ wget ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/gcc-10.2.0/gcc-10.2.0.tar.gz vagrant@ubuntu-groovy:~$ tar xzf gcc-10.2.0.tar.gz vagrant@ubuntu-groovy:~$ cd gcc-10.2.0 vagrant@ubuntu-groovy:~/gcc-10.2.0$ ./contrib/download_prerequisites vagrant@ubuntu-groovy:~/gcc-10.2.0$ cd .. vagrant@ubuntu-groovy:~$ mkdir build-gcc vagrant@ubuntu-groovy:~$ cd build-gcc vagrant@ubuntu-groovy:~/build-gcc$ vagrant@ubuntu-groovy:~/build-gcc$ export PREFIX=$HOME/install-gcc vagrant@ubuntu-groovy:~/build-gcc$ ../gcc-10.2.0/configure --prefix="$PREFIX" --disable-nls --enable-languages=c,c++ --disable-multilib vagrant@ubuntu-groovy:~/build-gcc$ make -j8 vagrant@ubuntu-groovy:~/build-gcc$ make install vagrant@ubuntu-groovy:~/build-gcc$ cd .. vagrant@ubuntu-groovy:~$ export PATH=$PREFIX/bin:$PATH vagrant@ubuntu-groovy:~$ g++ -v -save-temps -Wall --std=c++2a builder_simplified.cpp Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-10.2.0/configure --prefix=/home/vagrant/install-gcc --disable-nls --enable-languages=c,c++ --disable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 10.2.0 (GCC) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++2a' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE builder_simplified.cpp -mtune=generic -march=x86-64 -std=c++2a -Wall -fpch-preprocess -o builder_simplified.ii ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0 /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/x86_64-pc-linux-gnu /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../include/c++/10.2.0/backward /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include /usr/local/include /home/vagrant/install-gcc/include /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++2a' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/cc1plus -fpreprocessed builder_simplified.ii -quiet -dumpbase builder_simplified.cpp -mtune=generic -march=x86-64 -auxbase builder_simplified -Wall -std=c++2a -version -o builder_simplified.s GNU C++17 (GCC) version 10.2.0 (x86_64-pc-linux-gnu) compiled by GNU C version 10.2.0, GMP version 6.1.0, MPFR version 3.1.4, 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++17 (GCC) version 10.2.0 (x86_64-pc-linux-gnu) compiled by GNU C version 10.2.0, GMP version 6.1.0, MPFR version 3.1.4, 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: 431465f3c3fef2337a2db16592d4b8cd COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++2a' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v --64 -o builder_simplified.o builder_simplified.s GNU assembler version 2.35.1 (x86_64-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2.35.1 COMPILER_PATH=/home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/:/home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/:/home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/:/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/:/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/ LIBRARY_PATH=/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/:/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib64/:/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++2a' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/collect2 -plugin /home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/liblto_plugin.so -plugin-opt=/home/vagrant/install-gcc/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper -plugin-opt=-fresolution=builder_simplified.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 /lib/x86_64-linux-gnu/crt1.o /lib/x86_64-linux-gnu/crti.o /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtbegin.o -L/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0 -L/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -L/home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../.. builder_simplified.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /home/vagrant/install-gcc/lib/gcc/x86_64-pc-linux-gnu/10.2.0/crtend.o /lib/x86_64-linux-gnu/crtn.o COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-std=c++2a' '-shared-libgcc' '-mtune=generic' '-march=x86-64' vagrant@ubuntu-groovy:~$ ./a.out a.out: builder_simplified.cpp:46: int main(): Assertion `flags2[1]' failed. Aborted (core dumped)
