[Bug c++/84462] New: internal compiler error: in output_constructor_regular_field when creating array of structs (with testcase)

[christianlupus at web dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84462

            Bug ID: 84462
           Summary: internal compiler error: in
                    output_constructor_regular_field when creating array
                    of structs (with testcase)
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: christianlupus at web dot de
  Target Milestone: ---
              Host: avr

Created attachment 43458
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43458&action=edit
Minimal testcase

To trigger the problem one needs to invocate
# avr-g++ -O0 -v -save-temps -c bug.cpp -o bug.o
on the given input file. This results in the following output:

    Reading specs from /usr/lib/gcc/avr/7.3.0/device-specs/specs-avr2
    COLLECT_GCC=avr-g++
    Target: avr
    Configured with: /build/avr-gcc/src/gcc-7-20180125/configure
--disable-install-libiberty --disable-libssp --disable-libstdcxx-pch
--disable-libunwind-exceptions --disable-linker-build-id --disable-nls
--disable-werror --disable-__cxa_atexit --enable-checking=release
--enable-clocale=gnu --enable-gnu-unique-object --enable-gold
--enable-languages=c,c++ --enable-ld=default --enable-lto --enable-plugin
--enable-shared --infodir=/usr/share/info --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --prefix=/usr --target=avr
--with-as=/usr/bin/avr-as --with-gnu-as --with-gnu-ld --with-ld=/usr/bin/avr-ld
--with-plugin-ld=ld.gold --with-system-zlib --with-isl
--enable-gnu-indirect-function
    Thread model: single
    gcc version 7.3.0 (GCC) 
    COLLECT_GCC_OPTIONS='-O0' '-v' '-save-temps' '-c' '-o' 'bug.o'
'-specs=device-specs/specs-avr2'
    /usr/lib/gcc/avr/7.3.0/cc1plus -E -quiet -v bug.cpp -mn-flash=6 -mskip-bug
-O0 -fpch-preprocess -mn-flash=6 -mskip-bug -fno-rtti -fno-enforce-eh-specs
-fno-exceptions -o bug.ii
    ignoring nonexistent directory
"/usr/lib/gcc/avr/7.3.0/../../../../avr/include/c++/7.3.0"
    ignoring nonexistent directory
"/usr/lib/gcc/avr/7.3.0/../../../../avr/include/c++/7.3.0/avr"
    ignoring nonexistent directory
"/usr/lib/gcc/avr/7.3.0/../../../../avr/include/c++/7.3.0/backward"
    ignoring nonexistent directory
"/usr/lib/gcc/avr/7.3.0/../../../../avr/sys-include"
    #include "..." search starts here:
    #include <...> search starts here:
    /usr/lib/gcc/avr/7.3.0/include
    /usr/lib/gcc/avr/7.3.0/include-fixed
    /usr/lib/gcc/avr/7.3.0/../../../../avr/include
    End of search list.
    COLLECT_GCC_OPTIONS='-O0' '-v' '-save-temps' '-c' '-o' 'bug.o'
'-specs=device-specs/specs-avr2'
    /usr/lib/gcc/avr/7.3.0/cc1plus -fpreprocessed bug.ii -mn-flash=6 -mskip-bug
-quiet -dumpbase bug.cpp -auxbase-strip bug.o -O0 -version -mn-flash=6
-mskip-bug -fno-rtti -fno-enforce-eh-specs -fno-exceptions -o bug.s
    GNU C++14 (GCC) version 7.3.0 (avr)
            compiled by GNU C version 7.2.1 20180116, GMP version 6.1.2, MPFR
version 4.0.0, MPC version 1.1.0, isl version isl-0.18-GMP

    warning: MPFR header version 4.0.0 differs from library version 4.0.1.
    GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
    GNU C++14 (GCC) version 7.3.0 (avr)
            compiled by GNU C version 7.2.1 20180116, GMP version 6.1.2, MPFR
version 4.0.0, MPC version 1.1.0, isl version isl-0.18-GMP

    warning: MPFR header version 4.0.0 differs from library version 4.0.1.
    GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
    Compiler executable checksum: 1d5b2c6ab68d14352ece4d9fac25dd7b
    bug.cpp:33:1: internal compiler error: in output_constructor_regular_field,
at varasm.c:5031
    }
    ^
    Please submit a full bug report,
    with preprocessed source if appropriate.
    See <https://gcc.gnu.org/bugs/> for instructions.


When compiling for my amd64 machine the very same error happens, so it seems
not to be a problem of the avr target.
The gcc was installed as binary version from the Archlinux main repository for
amd64.

# avr-g++ -v
    Using built-in specs.
    Reading specs from /usr/lib/gcc/avr/7.3.0/device-specs/specs-avr2
    COLLECT_GCC=avr-g++
    COLLECT_LTO_WRAPPER=/usr/lib/gcc/avr/7.3.0/lto-wrapper
    Target: avr
    Configured with: /build/avr-gcc/src/gcc-7-20180125/configure
--disable-install-libiberty --disable-libssp --disable-libstdcxx-pch
--disable-libunwind-exceptions --disable-linker-build-id --disable-nls
--disable-werror --disable-__cxa_atexit --enable-checking=release
--enable-clocale=gnu --enable-gnu-unique-object --enable-gold
--enable-languages=c,c++ --enable-ld=default --enable-lto --enable-plugin
--enable-shared --infodir=/usr/share/info --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --prefix=/usr --target=avr
--with-as=/usr/bin/avr-as --with-gnu-as --with-gnu-ld --with-ld=/usr/bin/avr-ld
--with-plugin-ld=ld.gold --with-system-zlib --with-isl
--enable-gnu-indirect-function
    Thread model: single
    gcc version 7.3.0 (GCC)