diff --git a/script/bootstrap-gen0-install-prelinked-driver.sh b/script/bootstrap-gen0-install-prelinked-driver.sh
index c8ad91ff26f..286f9d76869 100755
--- a/script/bootstrap-gen0-install-prelinked-driver.sh
+++ b/script/bootstrap-gen0-install-prelinked-driver.sh
@@ -43,6 +43,78 @@ bootstrap_gen0_seed_prelinked_m3_sidecars() {
   fi
   cp -f "${minimal_seed}" "${minimal_blob}"
   chmod +x "${blob}" "${minimal_blob}"
+  local compiler_lib_seed="${root}/prelinked/bootstrap-gen0/compiler_lib_aot_blob"
+  if [[ -f "${compiler_lib_seed}" && -s "${compiler_lib_seed}" ]]; then
+    cp -f "${compiler_lib_seed}" "${root}/build/.m3_compiler_lib_aot_blob"
+    chmod +x "${root}/build/.m3_compiler_lib_aot_blob"
+    if [[ -f "${root}/prelinked/bootstrap-gen0/.m3_compiler_lib_sidecar.sha" ]]; then
+      cp -f "${root}/prelinked/bootstrap-gen0/.m3_compiler_lib_sidecar.sha" \
+        "${root}/build/.m3_compiler_lib_sidecar.sha"
+    fi
+  fi
+  return 0
+}
+
+# SHA-1 of M2 compiler_lib_spine_smoke entry (sidecar + inventory argv driver must match).
+bootstrap_compiler_lib_spine_entry_sha() {
+  local root="${ROOT:-}"
+  local entry="${root}/test/selfhost/compiler_lib_spine_smoke/main.php"
+  if [[ -z "${root}" || ! -f "${entry}" ]]; then
+    return 1
+  fi
+  sha1sum "${entry}" | awk '{print $1}'
+}
+
+# Ensure build/.m3_compiler_lib_aot_blob matches current spine entry (#3012, #2967).
+bootstrap_ensure_m3_compiler_lib_sidecar() {
+  local root="${ROOT:-}"
+  local entry="${root}/test/selfhost/compiler_lib_spine_smoke/main.php"
+  local blob="${root}/build/.m3_compiler_lib_aot_blob"
+  local stamp="${root}/build/.m3_compiler_lib_sidecar.sha"
+  if [[ -z "${root}" || ! -f "${entry}" ]]; then
+    echo "bootstrap-ensure-m3-compiler-lib-sidecar: missing spine entry ${entry}" >&2
+    return 1
+  fi
+  local want_sha
+  want_sha="$(bootstrap_compiler_lib_spine_entry_sha)" || return 1
+  if [[ -f "${blob}" && -s "${blob}" && -f "${stamp}" && "$(cat "${stamp}" 2>/dev/null)" == "${want_sha}" ]]; then
+    return 0
+  fi
+  bootstrap_gen0_seed_prelinked_m3_sidecars 2>/dev/null || true
+  if [[ -f "${blob}" && -s "${blob}" && -f "${stamp}" && "$(cat "${stamp}" 2>/dev/null)" == "${want_sha}" ]]; then
+    return 0
+  fi
+  if [[ "${BOOTSTRAP_SKIP_COMPILER_LIB_SIDECAR_REGEN:-0}" == "1" ]]; then
+    echo "bootstrap-ensure-m3-compiler-lib-sidecar: stale/missing ${blob} (BOOTSTRAP_SKIP_COMPILER_LIB_SIDECAR_REGEN=1)" >&2
+    return 1
+  fi
+  if ! command -v php >/dev/null 2>&1; then
+    echo "bootstrap-ensure-m3-compiler-lib-sidecar: php required to host-compile ${entry}" >&2
+    return 1
+  fi
+  echo "bootstrap-ensure-m3-compiler-lib-sidecar: host-compile spine entry -> ${blob} (#3012)" >&2
+  mkdir -p "${root}/build"
+  rm -f "${blob}"
+  local regen_log regen_code=0
+  set +e
+  regen_log="$(
+    env PHP_COMPILER_M3_EMIT_SIDECAR_RECURSION_GUARD=1 \
+      PHP_COMPILER_SELFHOST_AOT=1 \
+      PHP_COMPILER_CLI_SPINE_BUNDLE=1 \
+      PHP_COMPILER_MEMORY_LIMIT="${PHP_COMPILER_MEMORY_LIMIT:-4096M}" \
+      php -d "memory_limit=${PHP_COMPILER_MEMORY_LIMIT:-4096M}" \
+      "${root}/bin/compile.php" -o "${blob}" "${entry}" 2>&1
+  )"
+  regen_code=$?
+  set -e
+  if [[ "${regen_code}" -ne 0 || ! -f "${blob}" || ! -s "${blob}" ]]; then
+    printf '%s\n' "${regen_log}" >&2
+    echo "bootstrap-ensure-m3-compiler-lib-sidecar: host-compile failed (exit ${regen_code}); inventory argv driver may return parseAndCompile null (#2967)" >&2
+    echo "bootstrap-ensure-m3-compiler-lib-sidecar: hint: refresh prelinked/bootstrap-gen0 after spine entry changes, or fix Zend spine AOT (VM/JIT)" >&2
+    return 1
+  fi
+  chmod +x "${blob}"
+  printf '%s' "${want_sha}" >"${stamp}"
   return 0
 }
 
diff --git a/script/bootstrap-resolve-compile-invoke.sh b/script/bootstrap-resolve-compile-invoke.sh
index ce6c7c91fb5..00e67b294eb 100755
--- a/script/bootstrap-resolve-compile-invoke.sh
+++ b/script/bootstrap-resolve-compile-invoke.sh
@@ -127,6 +127,7 @@ bootstrap_ensure_inventory_argv_driver() {
     source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/bootstrap-gen0-install-prelinked-driver.sh"
   fi
   bootstrap_gen0_seed_prelinked_m3_sidecars 2>/dev/null || true
+  bootstrap_ensure_m3_compiler_lib_sidecar 2>/dev/null || true
   if ! env PHP_COMPILER_M3_SOURCE="${root}/bin/compile.php" PHP_COMPILER_M3_OUT="${out}" \
     "${root}/script/bootstrap-selfhost-helloworld-compile-bin.sh"; then
     local prelink="${root}/prelinked/bootstrap-gen0/bin-compile-aot"
@@ -137,12 +138,14 @@ bootstrap_ensure_inventory_argv_driver() {
       cp -f "${prelink}" "${root}/build/.m3_bin_compile_aot_blob"
       chmod +x "${out}" "${root}/build/.m3_bin_compile_aot_blob"
       if bootstrap_inventory_argv_driver_smoke "${out}"; then
+        bootstrap_ensure_m3_compiler_lib_sidecar 2>/dev/null || true
         return 0
       fi
     fi
     echo "bootstrap-ensure-inventory-argv-driver: helloworld-compile-bin failed" >&2
     return 1
   fi
+  bootstrap_ensure_m3_compiler_lib_sidecar 2>/dev/null || true
   if ! bootstrap_is_inventory_bin_compile_argv_driver "${out}"; then
     echo "bootstrap-ensure-inventory-argv-driver: ${out} is not a verified inventory argv driver" >&2
     return 1
diff --git a/script/bootstrap-selfhost-lib-spine-smoke-link.sh b/script/bootstrap-selfhost-lib-spine-smoke-link.sh
index 1f59df81326..ae26c9b2256 100755
--- a/script/bootstrap-selfhost-lib-spine-smoke-link.sh
+++ b/script/bootstrap-selfhost-lib-spine-smoke-link.sh
@@ -100,6 +100,9 @@ fi
 
 INVENTORY_ARGV_DRIVER="${ROOT}/build/bin-compile-aot-inventory"
 
+# M3 compiler_lib spine sidecar must match test/selfhost/compiler_lib_spine_smoke/main.php (#3012).
+bootstrap_ensure_m3_compiler_lib_sidecar 2>/dev/null || true
+
 # Prefer the proven inventory argv driver path (same strategy as bootstrap-selfhost-full-revision-probe, #2968).
 if [[ "${BOOTSTRAP_LIB_SPINE_SMOKE_USE_COMPILE_INVOKE:-0}" != "1" ]]; then
   SPINE_COMPILE_DRIVER=""
@@ -173,7 +176,8 @@ if [[ "${BOOTSTRAP_LIB_SPINE_SMOKE_USE_COMPILE_INVOKE:-0}" != "1" ]]; then
       if [[ "${BOOTSTRAP_LIB_SPINE_SMOKE_GEN0_FALLBACK:-1}" == "1" ]] && command -v php >/dev/null 2>&1; then
         echo "bootstrap-selfhost-lib-spine-smoke-link: gen-0 Zend fallback (native argv driver blocked; #2967)" >&2
         rm -f "${OUT}"
-        php "${ROOT}/bin/compile.php" -o "${OUT}" "${ENTRY}" 2>&1 || true
+        env PHP_COMPILER_SELFHOST_AOT=1 PHP_COMPILER_CLI_SPINE_BUNDLE=1 \
+          php "${ROOT}/bin/compile.php" -o "${OUT}" "${ENTRY}" 2>&1 || true
       fi
       if [[ ! -x "${OUT}" ]]; then
         echo "bootstrap-selfhost-lib-spine-smoke-link: compile failed (progress gate; see stderr above)" >&2
diff --git a/test/unit/BootstrapLibSpineVmSmokeTest.php b/test/unit/BootstrapLibSpineVmSmokeTest.php
index a082e1e69b9..e1b068b6975 100644
--- a/test/unit/BootstrapLibSpineVmSmokeTest.php
+++ b/test/unit/BootstrapLibSpineVmSmokeTest.php
@@ -44,6 +44,8 @@ public function testLibSpineLinkScriptSeedsSidecarsAndGen0Fallback(): void
         $script = (string) file_get_contents(self::$root.'/script/bootstrap-selfhost-lib-spine-smoke-link.sh');
         $this->assertStringContainsString('bootstrap-gen0-install-prelinked-driver.sh', $script);
         $this->assertStringContainsString('ci_ensure_vendor_patches', $script);
+        $this->assertStringContainsString('bootstrap_ensure_m3_compiler_lib_sidecar', $script);
+        $this->assertStringContainsString('PHP_COMPILER_CLI_SPINE_BUNDLE=1', $script);
         $this->assertStringContainsString('BOOTSTRAP_LIB_SPINE_SMOKE_GEN0_FALLBACK', $script);
         $this->assertStringContainsString('gen-0 Zend fallback', $script);
     }
diff --git a/test/unit/BootstrapSelfhostLinkTest.php b/test/unit/BootstrapSelfhostLinkTest.php
index 754baed2884..de3c41442b0 100644
--- a/test/unit/BootstrapSelfhostLinkTest.php
+++ b/test/unit/BootstrapSelfhostLinkTest.php
@@ -34,6 +34,9 @@ public function testLinkScriptInstallsPrelinkedGen0Driver(): void
         $this->assertStringContainsString('bootstrap_gen0_copy_prelinked_inventory_driver', $install);
         $this->assertStringContainsString('#2930', $install);
         $this->assertStringContainsString('compiler_minimal_aot_blob', $install);
+        $this->assertStringContainsString('bootstrap_ensure_m3_compiler_lib_sidecar', $install);
+        $this->assertStringContainsString('.m3_compiler_lib_aot_blob', $install);
+        $this->assertStringContainsString('bootstrap_compiler_lib_spine_entry_sha', $install);
         $this->assertFileExists(self::$root.'/prelinked/bootstrap-gen0/bin-compile-aot');
         $this->assertFileExists(self::$root.'/prelinked/bootstrap-gen0/compiler_minimal_aot_blob');
     }
@@ -50,6 +53,7 @@ public function testLinkScriptUsesCompiledDriverResolver(): void
         $this->assertStringContainsString('build/bin-compile-aot-inventory', $body);
         $this->assertStringContainsString('exited 0 but missing', $body);
         $this->assertStringContainsString('bootstrap_gen0_seed_prelinked_m3_sidecars', $body);
+        $this->assertStringContainsString('bootstrap_ensure_m3_compiler_lib_sidecar', $body);
         $this->assertStringContainsString('build/selfhost-compile-driver', $body);
         $this->assertStringContainsString('build/bin-compile-aot', $body);
         $this->assertStringContainsString(