[Python-checkins] [3.9] bpo-41116: Fix setup.py test for macOS Tcl/Tk frameworks (GH-23649) (GH-23650)

[ned-deily]

https://github.com/python/cpython/commit/06002b3f0d4570424feef37103c7e9b7d16bd63d
commit: 06002b3f0d4570424feef37103c7e9b7d16bd63d
branch: 3.9
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: ned-deily <nad at python.org>
date: 2020-12-04T23:26:59-05:00
summary:

[3.9] bpo-41116: Fix setup.py test for macOS Tcl/Tk frameworks (GH-23649) (GH-23650)

If no explicit macOS SDK was specified, setup.py should check for
Tcl and TK frameworks in /Library/Frameworks; the previous commit
inadvertently broke that test.
(cherry picked from commit 29afab6c5f656f07ac85c9b2cf089631b2557a11)

Co-authored-by: Ned Deily <nad at python.org>

files:
A Misc/NEWS.d/next/macOS/2020-12-04-23-09-11.bpo-41116.mSbXyV.rst
M setup.py

diff --git a/Misc/NEWS.d/next/macOS/2020-12-04-23-09-11.bpo-41116.mSbXyV.rst b/Misc/NEWS.d/next/macOS/2020-12-04-23-09-11.bpo-41116.mSbXyV.rst
new file mode 100644
index 0000000000000..2c8e5ea029734
--- /dev/null
+++ b/Misc/NEWS.d/next/macOS/2020-12-04-23-09-11.bpo-41116.mSbXyV.rst
@@ -0,0 +1,3 @@
+If no explicit macOS SDK was specified, setup.py should check for Tcl and TK
+frameworks in /Library/Frameworks; the previous commit inadvertently broke
+that test.
diff --git a/setup.py b/setup.py
index bfe621d0b50da..bd5f73692441c 100644
--- a/setup.py
+++ b/setup.py
@@ -177,10 +177,11 @@ def macosx_sdk_root():
     m = re.search(r'-isysroot\s*(\S+)', cflags)
     if m is not None:
         MACOS_SDK_ROOT = m.group(1)
+        MACOS_SDK_SPECIFIED = MACOS_SDK_ROOT != '/'
     else:
         MACOS_SDK_ROOT = _osx_support._default_sysroot(
             sysconfig.get_config_var('CC'))
-    MACOS_SDK_SPECIFIED = MACOS_SDK_ROOT != '/'
+        MACOS_SDK_SPECIFIED = False
 
     return MACOS_SDK_ROOT