Add new tests, remove redundant code

src/SPC/builder/BuilderBase.php

@@ -418,30 +418,6 @@ abstract class BuilderBase
         }
     }
 
-    /**
-     * Check if all libs are downloaded.
-     * If not, throw exception.
-     *
-     * @throws RuntimeException
-     */
-    protected function checkLibsSource(): void
-    {
-        $not_downloaded = [];
-        foreach ($this->libs as $lib) {
-            if (!file_exists($lib->getSourceDir())) {
-                $not_downloaded[] = $lib::NAME;
-            }
-        }
-        if ($not_downloaded !== []) {
-            throw new RuntimeException(
-                '"' . implode(', ', $not_downloaded) .
-                '" totally ' . count($not_downloaded) .
-                ' source' . (count($not_downloaded) === 1 ? '' : 's') .
-                ' not downloaded, maybe you need to "fetch" ' . (count($not_downloaded) === 1 ? 'it' : 'them') . ' first?'
-            );
-        }
-    }
-
     /**
      * Generate micro extension test php code.
      */

src/SPC/builder/linux/SystemUtil.php

@@ -6,7 +6,6 @@ namespace SPC\builder\linux;
 
 use SPC\builder\traits\UnixSystemUtilTrait;
 use SPC\exception\RuntimeException;
-use SPC\exception\WrongUsageException;
 
 class SystemUtil
 {
@@ -83,52 +82,6 @@ class SystemUtil
         };
     }
 
-    /**
-     * @throws RuntimeException
-     * @throws WrongUsageException
-     * @throws WrongUsageException
-     */
-    public static function getArchCFlags(string $cc, string $arch): string
-    {
-        if (php_uname('m') === $arch) {
-            return '';
-        }
-        return match (static::getCCType($cc)) {
-            'clang' => match ($arch) {
-                'x86_64' => '--target=x86_64-unknown-linux',
-                'arm64', 'aarch64' => '--target=arm64-unknown-linux',
-                default => throw new WrongUsageException('unsupported arch: ' . $arch),
-            },
-            'gcc' => '',
-            default => throw new WrongUsageException('cc compiler ' . $cc . ' is not supported'),
-        };
-    }
-
-    /**
-     * @throws RuntimeException
-     */
-    public static function getTuneCFlags(string $arch): array
-    {
-        return match ($arch) {
-            'x86_64', 'arm64', 'aarch64' => [],
-            default => throw new RuntimeException('unsupported arch: ' . $arch),
-        };
-    }
-
-    public static function checkCCFlags(array $flags, string $cc): array
-    {
-        return array_filter($flags, fn ($flag) => static::checkCCFlag($flag, $cc));
-    }
-
-    public static function checkCCFlag(string $flag, string $cc): string
-    {
-        [$ret] = shell()->execWithResult("echo | {$cc} -E -x c - {$flag} 2>/dev/null");
-        if ($ret != 0) {
-            return '';
-        }
-        return $flag;
-    }
-
     /**
      * @throws RuntimeException
      * @noinspection PhpUnused