strange SDKs in El Capitan...

[Ken Cunningham]

In trying to track down a build failure of clang-3.7 on El Cap, I found it only builds there if “use_xode yes” is selected...

In trying to understand why that is, I find this odd SDK difference. It’s on two different El Cap machines I have. Does everyone with El Cap have this issue - the last Xcode has MacOSX10.11 SDK but the CLTs have MacOSX10.12 SDK? 

If so, no wonder we see strange errors:


$ ls -la /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
total 0
drwxr-xr-x  3 root  wheel  102  3 Mar  2016 .
drwxr-xr-x  5 root  wheel  170 26 Apr  2016 ..
drwxr-xr-x  5 root  wheel  170 20 Oct  2020 MacOSX10.11.sdk


$ ls -la /Library/Developer/CommandLineTools/SDK*
total 8
drwxr-xr-x  4 root  wheel  136  1 Jul  2017 .
drwxr-xr-x  5 root  admin  170  1 Jul  2017 ..
drwxr-xr-x  5 root  wheel  170 17 Sep  2017 MacOSX.sdk
lrwxr-xr-x  1 root  wheel   10  1 Jul  2017 MacOSX10.12.sdk -> MacOSX.sdk



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