1--- a/tools/gyp/pylib/gyp/xcode_emulation.py
2+++ a/tools/gyp/pylib/gyp/xcode_emulation.py
3@@ -473,10 +473,16 @@
4
5 def _XcodeSdkPath(self, sdk_root):
6 if sdk_root not in XcodeSettings._sdk_path_cache:
7- sdk_path = self._GetSdkVersionInfoItem(sdk_root, '--show-sdk-path')
8- XcodeSettings._sdk_path_cache[sdk_root] = sdk_path
9- if sdk_root:
10- XcodeSettings._sdk_root_cache[sdk_path] = sdk_root
11+ try:
12+ sdk_path = self._GetSdkVersionInfoItem(sdk_root, '--show-sdk-path')
13+ XcodeSettings._sdk_path_cache[sdk_root] = sdk_path
14+ if sdk_root:
15+ XcodeSettings._sdk_root_cache[sdk_path] = sdk_root
16+ except:
17+ # if this fails it's because xcodebuild failed, which means
18+ # the user is probably on a CLT-only system, where there
19+ # is no valid SDK root
20+ XcodeSettings._sdk_path_cache[sdk_root] = None
21 return XcodeSettings._sdk_path_cache[sdk_root]
22
23 def _AppendPlatformVersionMinFlags(self, lst):
24@@ -606,10 +612,11 @@
25 framework_root = sdk_root
26 else:
27 framework_root = ''
28- config = self.spec['configurations'][self.configname]
29- framework_dirs = config.get('mac_framework_dirs', [])
30- for directory in framework_dirs:
31- cflags.append('-F' + directory.replace('$(SDKROOT)', framework_root))
32+ if 'SDKROOT' in self._Settings():
33+ config = self.spec['configurations'][self.configname]
34+ framework_dirs = config.get('mac_framework_dirs', [])
35+ for directory in framework_dirs:
36+ cflags.append('-F' + directory.replace('$(SDKROOT)', framework_root))
37
38 self.configname = None
39 return cflags
40@@ -861,10 +868,11 @@
41 sdk_root = self._SdkPath()
42 if not sdk_root:
43 sdk_root = ''
44- config = self.spec['configurations'][self.configname]
45- framework_dirs = config.get('mac_framework_dirs', [])
46- for directory in framework_dirs:
47- ldflags.append('-F' + directory.replace('$(SDKROOT)', sdk_root))
48+ if 'SDKROOT' in self._Settings():
49+ config = self.spec['configurations'][self.configname]
50+ framework_dirs = config.get('mac_framework_dirs', [])
51+ for directory in framework_dirs:
52+ ldflags.append('-F' + directory.replace('$(SDKROOT)', sdk_root))
53
54 platform_root = self._XcodePlatformPath(configname)
55 if sdk_root and platform_root and self._IsXCTest():
56@@ -1358,7 +1366,7 @@
57 if version:
58 version = re.match(r'(\d\.\d\.?\d*)', version).groups()[0]
59 else:
60- raise GypError("No Xcode or CLT version detected!")
61+ version = "7.0.0"
62 # The CLT has no build information, so we return an empty string.
63 version_list = [version, '']
64 version = version_list[0]