[Bug c++/104507] New: internal compiler error: unexpected expression ‘(int)(__ret)’ of kind cast_expr

["junk at sigpwr dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104507

            Bug ID: 104507
           Summary: internal compiler error: unexpected expression
                    ‘(int)(__ret)’ of kind cast_expr
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: junk at sigpwr dot com
  Target Milestone: ---

Created attachment 52423
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52423&action=edit
repro ii file

Observed on multiple builds of GCC 11.2 (originally on a couple
cross-compilers, then reproduced on debian)

GCC details:

COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 11.2.0-14'
--with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--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 --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-11-lKfaJs/gcc-11-11.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-lKfaJs/gcc-11-11.2.0/debian/tmp-gcn/usr
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-serialization=8
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.2.0 (Debian 11.2.0-14)

Command line to reproduce:

gcc -save-temps repro.cc -c -o repro.o
repro.cc: In function ‘int DoFoo()’:
repro.cc:11:89: internal compiler error: unexpected expression ‘(int)(__ret)’
of kind cast_expr
   11 |   const char *n = s_errmsg(__ret);
      |                                                                        
                ^
0x7fce4df477ec __libc_start_main
        ../csu/libc-start.c:332
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-11/README.Bugs> for instructions.

Contents of repro.cc (.ii file attached):

#define ERR_MAX -20

#define s_errmsg(r)          \
        _k_errmsg[(((int)r) <= 0 && ((int)r) > ERR_MAX) ? -(r) : -ERR_MAX]

extern const char *_k_errmsg[];

template <int size>
inline int DoFoo() {
  int __ret = 0;
  const char *n = s_errmsg(__ret);
  return __ret;
}