[llvm-bugs] [Bug 45880] regression: locally-built Clang can't find C++ stdlib headers on Mac

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45880

Louis Dionne <ldionne at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED

--- Comment #25 from Louis Dionne <ldionne at apple.com> ---
(In reply to Sean McBride from comment #24)
> 
> If `/usr/bin/clang` can do it, why can't the open source binaries do it?

The main difference is that when you invoke Apple Clang (e.g.
`/usr/bin/clang`), you're actually going through a shim that calls `xcrun
/path/to/actual/clang/inside/Xcode.app`, and that sets the SDK to use by
default. For the open-source Clang, you might or might not even have a SDK
available, cause it's possible to install LLVM Clang without having any Xcode.

Regardless, I went ahead and tried implementing it in Clang:
https://reviews.llvm.org/D109460. This patch does solve your problem but it
creates other problems as well. I opened that review to see whether this was
worth pursuing or not.

Reopening until we get to the bottom of this.

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