Initial project import

tools/v/cmd/v2/test_v2_self.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd -- "${script_dir}/../.." && pwd)"
+
+v2_source="${script_dir}/v2.v"
+v2_bin="${script_dir}/v2"
+v3_bin="${script_dir}/v3"
+v4_bin="${script_dir}/v4"
+v5_bin="${script_dir}/v5"
+
+# Variable for the backend (originally cleanc)
+backend="cleanc"
+
+v1_compiler="${V:-${repo_root}/v}"
+if [[ ! -x "${v1_compiler}" ]]; then
+    fallback_v1_compiler="${HOME}/code/v/v"
+    if [[ -x "${fallback_v1_compiler}" ]]; then
+        v1_compiler="${fallback_v1_compiler}"
+    else
+        echo "FAILURE: v1 compiler not found or not executable: ${v1_compiler}"
+        exit 1
+    fi
+fi
+
+# V1's formatter may clobber v2 source files — backup and restore.
+v2_src="${repo_root}/vlib/v2_toberemoved"
+v2_bak="/tmp/v2_src_bak_self_test"
+rm -rf "${v2_bak}"
+cp -R "${v2_src}" "${v2_bak}"
+
+# Build v2 with v1.
+rm -f "${v2_bin}" "${v3_bin}" "${v3_bin}.c" "${v4_bin}" "${v4_bin}.c" "${v5_bin}" "${v5_bin}.c"
+"${v1_compiler}" -gc none -cc cc -o "${v2_bin}" "${v2_source}"
+
+# Restore v2 sources after V1 build.
+rsync -a --delete "${v2_bak}/" "${v2_src}/"
+
+# Use clang instead of TCC for v2-compiled C code.
+export V2CC="${V2CC:-cc}"
+
+# Clear stale caches to avoid reusing incompatible generated C across runs.
+rm -rf /tmp/v2_cleanc_obj_cache
+
+# Use v2 to compile itself to v3 (using defined backend).
+"${v2_bin}" -gc none -o "${v3_bin}" -backend "${backend}" "${v2_source}"
+
+echo "SUCCESS: v2 successfully compiled itself to v3"
+echo "v3 binary size: $(ls -lh "${v3_bin}" | awk '{print $5}')"
+
+if [[ "${backend}" != "cleanc" ]]; then
+    "${v3_bin}" -gc none -o "${v4_bin}" -backend "${backend}" "${v2_source}"
+    printf '\nV4 compiled\n\n'
+
+    "${v4_bin}" -gc none -o "${v5_bin}" -backend "${backend}" "${v2_source}"
+    printf '\nV5 compiled\n\n'
+fi
+
+# Test that v3 runs and produces expected output.
+output="$("${v3_bin}" 2>&1 || true)"
+expected='At least 1 .v file expected'
+
+if echo "${output}" | grep -q "${expected}"; then
+    echo "SUCCESS"
+else
+    echo "FAILURE: Expected '${expected}' but got:"
+    echo "${output}"
+    exit 1
+fi
+
+echo ''
+echo '=== SELF-COMPILATION TEST PASSED ==='