1 files changed, 68 insertions, 0 deletions
diff --git a/TOOLS/macos-sdk-version.py b/TOOLS/macos-sdk-version.py
new file mode 100755
index 0000000000..ead1a1c2be
--- /dev/null
+++ b/TOOLS/macos-sdk-version.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+
+# Logic copied from compiler_swift.py in the waf build. This checks for the sdk
+# path, the sdk version, and the sdk build version. The sdk path is returned
+# along with what is selected as the sdk version.
+
+import re
+import os
+import string
+import sys
+from distutils.version import StrictVersion
+from shutil import which
+from subprocess import check_output
+
+def find_macos_sdk():
+    sdk = os.environ.get('MACOS_SDK', '')
+    sdk_version = os.environ.get('MACOS_SDK_VERSION', '0.0')
+    xcrun = which('xcrun')
+
+    if not xcrun:
+        return sdk,sdk_version
+
+    if not sdk:
+        sdk = check_output([xcrun, '--sdk', 'macosx', '--show-sdk-path'],
+                            encoding="UTF-8")
+    
+    # find macOS SDK paths and version
+    if sdk_version == '0.0':
+        # show-sdk-build-version: is not available on older command line tools, but returns a build version (eg 17A360)
+        # show-sdk-version: is always available, but on older dev tools it's only the major version
+        sdk_build_version = check_output([xcrun, '--sdk', 'macosx',
+                                          '--show-sdk-build-version'], encoding="UTF-8")
+
+        sdk_version = check_output([xcrun, '--sdk', 'macosx', '--show-sdk-version'],
+                                    encoding="UTF-8")
+
+    if sdk:
+        build_version = '10.10.0'
+
+    # convert build version to a version string
+    # first 2 two digits are the major version, starting with 15 which is 10.11 (offset of 4)
+    # 1 char is the minor version, A => 0, B => 1 and ongoing
+    # last digits are bugfix version, which are not relevant for us
+    # eg 16E185 => 10.12.4, 17A360 => 10.13, 18B71 => 10.14.1
+    if sdk_build_version and isinstance(sdk_build_version, str):
+        verRe = re.compile("(\d+)(\D+)(\d+)")
+        version_parts = verRe.search(sdk_build_version)
+        major = int(version_parts.group(1)) - 4
+        minor = string.ascii_lowercase.index(version_parts.group(2).lower())
+        build_version = '10.' + str(major) + '.' + str(minor)
+        # from 20 onwards macOS 11.0 starts
+        if int(version_parts.group(1)) >= 20:
+            build_version = '11.' + str(minor)
+
+    if not isinstance(sdk_version, str):
+        sdk_version = '10.10.0'
+
+    # pick the higher version, always pick sdk over build if newer
+    if StrictVersion(build_version) > StrictVersion(sdk_version):
+        return sdk,build_version
+    else:
+        return sdk,sdk_version
+
+    return sdk,sdk_version
+
+if __name__ == "__main__":
+    sdk_info = find_macos_sdk()
+    sys.stdout.write(','.join(sdk_info))