compiler: add GCC common options generator

compiler.ts

@@ -93,6 +93,35 @@ export async function extract(options: ExtractOptions) {
     return exitcode
 }
 
+export interface GeneralOptions {
+    output?: string;
+
+    outputKind?: "exe" | "object" | "assembly" | "preprocessed"
+}
+
+export function generalCommand(options: GeneralOptions) {
+    return [
+        ...(options.output ? ["-o", options.output] : []),
+        ...(options.outputKind ? {
+            exe: [],
+            object: ["-c"],
+            assembly: ["-S"],
+            preprocessed: ["-E"]
+        }[options.outputKind] : [])
+    ]
+}
+
+export interface PreprocessorOptions {
+    includeDirs?: string[];
+}
+
+export function preprocessorCommand(options: PreprocessorOptions) {
+    return [
+        ...((options.includeDirs ?? []).flatMap(name => ["-I", name]))
+    ]
+}
+
+
 
 /**
  * Links objects into an executable using specified environment variables and paths.