fix(build): support absolute DerivedData paths with xcodemake

CHANGELOG.md

@@ -18,6 +18,7 @@
 - Fixed `suppressWarnings` being ignored in settled build, build-run, and test output. The flag was honored only while streaming, so warnings still reached the final MCP tool response ([#447](https://github.com/getsentry/XcodeBuildMCP/issues/447)).
 - Fixed iOS scaffold orientation and device-family settings, LLDB command isolation and argument escaping, run-destination parsing without an active scheme, concurrent working-directory mutations, blocking physical-device name lookup, and unverified `xcodemake` downloads ([#459](https://github.com/getsentry/XcodeBuildMCP/issues/459)).
 - Fixed simulator UI launching and keyboard controls to prefer Xcode 27's Device Hub when available, with Simulator.app as the legacy fallback.
+- Fixed incremental `xcodemake` builds when DerivedData uses an absolute path by updating the pinned wrapper and delegating Makefile reuse to it so its argument and freshness checks are always applied ([#466](https://github.com/getsentry/XcodeBuildMCP/issues/466)).
 
 ## [2.6.2]
 

src/utils/__tests__/build-utils-xcodemake.test.ts

@@ -0,0 +1,111 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { mkdtempSync, rmSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import path from 'node:path';
+import { createMockExecutor } from '../../test-utils/mock-executors.ts';
+
+const { executeXcodemakeCommandMock } = vi.hoisted(() => ({
+  executeXcodemakeCommandMock: vi.fn(),
+}));
+
+vi.mock('../xcodemake.ts', () => ({
+  isXcodemakeEnabled: () => true,
+  isXcodemakeAvailable: () => Promise.resolve(true),
+  executeXcodemakeCommand: executeXcodemakeCommandMock,
+}));
+
+import { executeXcodeBuildCommand } from '../build-utils.ts';
+import { XcodePlatform } from '../xcode.ts';
+
+describe('build-utils xcodemake lifecycle', () => {
+  let projectDirectory: string;
+
+  beforeEach(() => {
+    projectDirectory = mkdtempSync(path.join(tmpdir(), 'xcodebuildmcp-xcodemake-'));
+    writeFileSync(path.join(projectDirectory, 'Makefile'), 'all:\n\t@true\n');
+    executeXcodemakeCommandMock.mockResolvedValue({ success: true, output: 'BUILD SUCCEEDED' });
+  });
+
+  afterEach(() => {
+    rmSync(projectDirectory, { recursive: true, force: true });
+    vi.clearAllMocks();
+  });
+
+  it('delegates existing Makefile validation to xcodemake for external DerivedData', async () => {
+    const workspacePath = path.join(projectDirectory, 'MyWorkspace.xcworkspace');
+    const derivedDataPath =
+      '/Users/developer/Library/Developer/XcodeBuildMCP/DerivedData/MyWorkspace-57a542dedf16';
+    const executorCall = vi.fn();
+    const executor = createMockExecutor({ onExecute: executorCall });
+
+    const result = await executeXcodeBuildCommand(
+      {
+        scheme: 'MyScheme',
+        configuration: 'Debug',
+        workspacePath,
+        derivedDataPath,
+      },
+      {
+        platform: XcodePlatform.iOSSimulator,
+        simulatorId: 'SIMULATOR-UDID',
+        logPrefix: 'iOS Simulator Build',
+      },
+      false,
+      'build',
+      executor,
+    );
+
+    expect(result.isError).toBeFalsy();
+    expect(executorCall).not.toHaveBeenCalled();
+    expect(executeXcodemakeCommandMock).toHaveBeenCalledWith(
+      projectDirectory,
+      [
+        '-workspace',
+        workspacePath,
+        '-scheme',
+        'MyScheme',
+        '-configuration',
+        'Debug',
+        '-skipMacroValidation',
+        '-destination',
+        'platform=iOS Simulator,id=SIMULATOR-UDID',
+        '-collect-test-diagnostics',
+        'never',
+        '-derivedDataPath',
+        derivedDataPath,
+        'build',
+      ],
+      'iOS Simulator Build',
+    );
+  });
+
+  it('uses the current working directory when no project or workspace path is provided', async () => {
+    const derivedDataPath =
+      '/Users/developer/Library/Developer/XcodeBuildMCP/DerivedData/MyScheme-57a542dedf16';
+    const executorCall = vi.fn();
+    const executor = createMockExecutor({ onExecute: executorCall });
+
+    const result = await executeXcodeBuildCommand(
+      {
+        scheme: 'MyScheme',
+        derivedDataPath,
+      },
+      {
+        platform: XcodePlatform.iOSSimulator,
+        simulatorId: 'SIMULATOR-UDID',
+        logPrefix: 'iOS Simulator Build',
+      },
+      false,
+      'build',
+      executor,
+    );
+
+    expect(result.isError).toBeFalsy();
+    expect(executorCall).not.toHaveBeenCalled();
+    expect(executeXcodemakeCommandMock).toHaveBeenCalledWith(
+      process.cwd(),
+      expect.arrayContaining(['-derivedDataPath', derivedDataPath]),
+      'iOS Simulator Build',
+    );
+  });
+});

src/utils/__tests__/fixtures/xcodemake/README.md

@@ -0,0 +1,9 @@
+# Pinned xcodemake test data
+
+`xcodemake-75f47d4b69c1604cb886ab37d348c2c245d18329` is an exact, unmodified copy of
+[`cameroncooke/xcodemake` at commit `75f47d4b69c1604cb886ab37d348c2c245d18329`](https://github.com/cameroncooke/xcodemake/blob/75f47d4b69c1604cb886ab37d348c2c245d18329/xcodemake).
+
+SHA-256: `0934f784661f8b295f51064b8e94659c986ca25affc5062f20d5210ae0e25201`
+
+The wrapper regression test verifies this checksum against the production pin before execution. Do
+not edit the fixture independently of `XCODEMAKE_COMMIT` and `XCODEMAKE_SHA256`.