C++ Ada anonymous enums

/* { dg-do compile } */
/* { dg-options "-std=gnu++20 -fdump-ada-spec-slim" } */
/* { dg-final { scan-file anonymous_enums_c.ads "Sequential_Zero" } } */
/* { dg-final { scan-file anonymous_enums_c.ads "Sequential_One" } } */
/* { dg-final { scan-file anonymous_enums_c.ads "Sparse_Minus : constant anon_enum[0-9]+ := -1;" } } */
/* { dg-final { scan-file anonymous_enums_c.ads "Sparse_Five : constant anon_enum[0-9]+ := 5;" } } */

enum { Sequential_Zero, Sequential_One };
enum { Sparse_Minus = -1, Sparse_Five = 5 };

extern "C" int
sequential_value (decltype (Sequential_Zero) value)
{
  return value;
}

extern "C" int
sparse_value (decltype (Sparse_Minus) value)
{
  return value;
}

/* { dg-final { cleanup-ada-spec } } */

with Interfaces.C; use Interfaces.C;
with Anonymous_Enums_C;

procedure Anonymous_Enums_Consumer is
   package Bindings renames Anonymous_Enums_C;
begin
   if Bindings.sequential_value (Bindings.Sequential_One) /= 1
     or else Bindings.sparse_value (Bindings.Sparse_Minus) /= -1
     or else Bindings.sparse_value (Bindings.Sparse_Five) /= 5
   then
      raise Program_Error with "anonymous enumeration values were lost";
   end if;
end Anonymous_Enums_Consumer;

#!/usr/bin/env bash
set -euo pipefail

if [[ $# -ne 3 ]]; then
  echo "usage: $0 TOOLCHAIN_ROOT GCC_VERSION unpatched|patched" >&2
  exit 2
fi

root=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
source "$root/scripts/regression-common.sh"
resolve_regression_toolchain "$1"
version=$2
state=$3
[[ "$state" == unpatched || "$state" == patched ]] || {
  echo "error: state must be unpatched or patched" >&2
  exit 2
}

gxx="$REGRESSION_TOOLCHAIN/bin/g++"
[[ -x "$gxx" ]] || {
  echo "error: no g++ in $REGRESSION_TOOLCHAIN" >&2
  exit 1
}

cxx_fixture="$root/bundles/cxx-ada-anonymous-enums/tests/anonymous-enums.C"
ada_fixture="$root/bundles/cxx-ada-anonymous-enums/tests/anonymous_enums_consumer.adb"
work=$(mktemp -d "${TMPDIR:-/tmp}/gnat-cxx-ada-anonymous-enums.XXXXXX")
trap 'rm -rf "$work"' EXIT

for optimization in 0 2; do
  case_dir="$work/O$optimization"
  mkdir -p "$case_dir"
  cp "$cxx_fixture" "$ada_fixture" "$case_dir/"
  (
    cd "$case_dir"
    "${REGRESSION_ENV[@]}" "$gxx" -std=gnu++20 -c "-O$optimization" \
      -fdump-ada-spec-slim anonymous-enums.C
  )

  spec="$case_dir/anonymous_enums_c.ads"
  [[ -f "$spec" ]] || {
    echo "error: g++ did not generate $spec" >&2
    exit 1
  }

  set +e
  (
    cd "$case_dir"
    "${REGRESSION_ENV[@]}" "$REGRESSION_GNATMAKE" -q -f \
      "-O$optimization" anonymous_enums_consumer.adb \
      -largs anonymous-enums.o -lstdc++
    "${REGRESSION_ENV[@]}" ./anonymous_enums_consumer
  ) >"$case_dir/run.log" 2>&1
  run_status=$?
  set -e

  if [[ "$state" == unpatched ]]; then
    [[ $run_status -ne 0 ]] || {
      echo "error: unpatched anonymous-enum regression unexpectedly passed" >&2
      exit 1
    }
    grep -Eiq 'anon_anon_[0-9]+.*(undefined|incomplete)|Sequential_One.*not declared' \
      "$case_dir/run.log" || {
      cat "$case_dir/run.log"
      exit 1
    }
    echo "cxx-ada-anonymous-enums -O$optimization: expected omission (GCC $version)"
    continue
  fi

  [[ $run_status -eq 0 ]] || {
    cat "$case_dir/run.log"
    exit 1
  }
  grep -Eq 'type anon_enum[0-9]+ is' "$spec"
  grep -Eq 'subtype anon_enum[0-9]+ is int;' "$spec"
  echo "cxx-ada-anonymous-enums -O$optimization: patched (GCC $version)"
done