[Bug c++/93064] New: ICE on C++20 operator<=> use

[jengelh at inai dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93064

            Bug ID: 93064
           Summary: ICE on C++20 operator<=> use
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jengelh at inai dot de
  Target Milestone: ---

» cat x.cpp 
#include <memory>
#include <cstdio>
struct D {
        D() { printf("*D\n"); }
        ~D() { printf("~D\n"); }
        auto operator<=>(const D &) = default;
};
int main()
{
        D d;
        d <=> d;
}


» g++-10 -v x.cpp -std=c++2a
Using built-in specs.
COLLECT_GCC=g++-10
COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/10/lto-wrapper
OFFLOAD_TARGET_NAMES=hsa:nvptx-none
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,ada,go,d
--enable-offload-targets=hsa,nvptx-none=/usr/nvptx-none, --without-cuda-driver
--disable-werror --with-gxx-include-dir=/usr/include/c++/10 --enable-ssp
--disable-libssp --disable-libvtv --disable-cet --disable-libcc1
--enable-plugin --with-bugurl=https://bugs.opensuse.org/
--with-pkgversion='SUSE Linux' --with-slibdir=/lib64 --with-system-zlib
--enable-libstdcxx-allocator=new --disable-libstdcxx-pch --enable-libphobos
--enable-version-specific-runtime-libs --with-gcc-major-version-only
--enable-linker-build-id --enable-linux-futex --enable-gnu-indirect-function
--program-suffix=-10 --without-system-libunwind --enable-multilib
--with-arch-32=x86-64 --with-tune=generic
--with-build-config=bootstrap-lto-lean --enable-link-mutex
--build=x86_64-suse-linux --host=x86_64-suse-linux
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.0 20191210 (experimental) (SUSE Linux) 
COLLECT_GCC_OPTIONS='-v' '-std=c++2a' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /usr/lib64/gcc/x86_64-suse-linux/10/cc1plus -quiet -v -D_GNU_SOURCE x.cpp
-quiet -dumpbase x.cpp -mtune=generic -march=x86-64 -auxbase x -std=c++2a
-version -o /tmp/ccBzGUTo.s
GNU C++17 (SUSE Linux) version 10.0.0 20191210 (experimental)
(x86_64-suse-linux)
        compiled by GNU C version 10.0.0 20191210 (experimental), GMP version
6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.20-GMP

GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/10
 /usr/include/c++/10/x86_64-suse-linux
 /usr/include/c++/10/backward
 /usr/lib64/gcc/x86_64-suse-linux/10/include
 /usr/local/include
 /usr/lib64/gcc/x86_64-suse-linux/10/include-fixed
 /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/include
 /usr/include
End of search list.
GNU C++17 (SUSE Linux) version 10.0.0 20191210 (experimental)
(x86_64-suse-linux)
        compiled by GNU C version 10.0.0 20191210 (experimental), GMP version
6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.20-GMP

GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 17fc461878f813b85b050d0380f89fc7
x.cpp:6:7: error: defaulted ‘auto D::operator<=>(const D&)’ must be ‘const’
    6 |  auto operator<=>(const D &) = default;
      |       ^~~~~~~~
x.cpp: In member function ‘constexpr auto D::operator<=>(const D&)’:
x.cpp:6:7: internal compiler error: Segmentation fault
0x7fa3e9f2a14f ???
       
/usr/src/debug/glibc-2.30-2.1.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x7fa3e9f14e0a __libc_start_main
        ../csu/libc-start.c:308
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://bugs.opensuse.org/> for instructions.