dump-symbol-graph: drop -emit-extension-block-symbols and -omit-extension-block-symbols flags for unsupported compiler versions

Author: theMomax

Sources/Commands/Utilities/SymbolGraphExtract.swift

@@ -16,6 +16,7 @@ import PackageGraph
 import PackageModel
 import SPMBuildCore
 import TSCBasic
+import DriverSupport
 
 /// A wrapper for swift-symbolgraph-extract tool.
 public struct SymbolGraphExtract {
@@ -71,11 +72,14 @@ public struct SymbolGraphExtract {
         if includeSPISymbols {
             commandLine += ["-include-spi-symbols"]
         }
-        if emitExtensionBlockSymbols {
-            commandLine += ["-emit-extension-block-symbols"]
+        
+        let extensionBlockSymbolsFlag = emitExtensionBlockSymbols ? "-emit-extension-block-symbols" : "-omit-extension-block-symbols"
+        if DriverSupport.checkSupportedFrontendFlags(flags: [extensionBlockSymbolsFlag.trimmingCharacters(in: ["-"])], fileSystem: fileSystem) {
+            commandLine += [extensionBlockSymbolsFlag]
         } else {
-            commandLine += ["-omit-extension-block-symbols"]
+            print("warning: dropped \(extensionBlockSymbolsFlag) flag because it is not supported by this compiler version")
         }
+        
         switch outputFormat {
         case .json(let pretty):
             if pretty {