diff --git a/src/SPC/builder/BuilderBase.php b/src/SPC/builder/BuilderBase.php
index e6e27cda..fdba936d 100644
--- a/src/SPC/builder/BuilderBase.php
+++ b/src/SPC/builder/BuilderBase.php
@@ -128,27 +128,6 @@ abstract class BuilderBase
         return array_filter($this->exts, fn ($ext) => $ext->isBuildStatic());
     }
 
-    /**
-     * Check if there is a cpp extensions or libraries.
-     */
-    public function hasCpp(): bool
-    {
-        // judge cpp-extension
-        $exts = array_keys($this->getExts(false));
-        foreach ($exts as $ext) {
-            if (Config::getExt($ext, 'cpp-extension', false) === true) {
-                return true;
-            }
-        }
-        $libs = array_keys($this->getLibs());
-        foreach ($libs as $lib) {
-            if (Config::getLib($lib, 'cpp-library', false) === true) {
-                return true;
-            }
-        }
-        return false;
-    }
-
     /**
      * Set libs only mode.
      *
diff --git a/src/SPC/util/SPCConfigUtil.php b/src/SPC/util/SPCConfigUtil.php
index 49561c5b..edbb9926 100644
--- a/src/SPC/util/SPCConfigUtil.php
+++ b/src/SPC/util/SPCConfigUtil.php
@@ -6,6 +6,8 @@ namespace SPC\util;
 
 use SPC\builder\BuilderBase;
 use SPC\builder\BuilderProvider;
+use SPC\builder\Extension;
+use SPC\builder\LibraryBase;
 use SPC\exception\WrongUsageException;
 use SPC\store\Config;
 use Symfony\Component\Console\Input\ArgvInput;
@@ -87,7 +89,7 @@ class SPCConfigUtil
         if (SPCTarget::getTargetOS() === 'Darwin') {
             $libs .= " {$this->getFrameworksString($extensions)}";
         }
-        if ($this->builder->hasCpp() || collect($extensions)->contains(static fn (string $ext) => Config::getExt($ext)['cpp-extension'] ?? false)) {
+        if ($this->hasCpp($extensions, $libraries)) {
             $libcpp = SPCTarget::getTargetOS() === 'Darwin' ? '-lc++' : '-lstdc++';
             $libs = str_replace($libcpp, '', $libs) . " {$libcpp}";
         }
@@ -123,6 +125,29 @@ class SPCConfigUtil
         ];
     }
 
+    private function hasCpp(array $extensions, array $libraries): bool
+    {
+        // judge cpp-extension
+        $builderExtNames = array_keys($this->builder->getExts(false));
+        $extNames = array_map(fn (Extension $x) => $x->getName(), $extensions);
+        $exts = array_unique([...$builderExtNames, ...$extNames]);
+
+        foreach ($exts as $ext) {
+            if (Config::getExt($ext, 'cpp-extension', false) === true) {
+                return true;
+            }
+        }
+        $builderLibNames = array_keys($this->builder->getLibs());
+        $libNames = array_map(fn (LibraryBase $x) => $x->getName(), $libraries);
+        $libs = array_unique([...$builderLibNames, ...$libNames]);
+        foreach ($libs as $lib) {
+            if (Config::getLib($lib, 'cpp-library', false) === true) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private function getIncludesString(array $libraries): string
     {
         $base = BUILD_INCLUDE_PATH;
diff --git a/tests/SPC/builder/BuilderTest.php b/tests/SPC/builder/BuilderTest.php
index d28bd4d3..b4b6258f 100644
--- a/tests/SPC/builder/BuilderTest.php
+++ b/tests/SPC/builder/BuilderTest.php
@@ -62,12 +62,6 @@ class BuilderTest extends TestCase
         $this->assertInstanceOf(Extension::class, $this->builder->getExt('mbregex'));
     }
 
-    public function testHasCpp()
-    {
-        // mbregex doesn't have cpp
-        $this->assertFalse($this->builder->hasCpp());
-    }
-
     public function testMakeExtensionArgs()
     {
         $this->assertStringContainsString('--enable-mbstring', $this->builder->makeStaticExtensionArgs());