[PATCH] D136315: [clang][Darwin] Try to guess the SDK root with xcrun when unspecified

[Steven Wu via Phabricator via cfe-commits]

steven_wu added a comment.

In D136315#4067205 <https://reviews.llvm.org/D136315#4067205>, @calebzulawski wrote:

> One thing to throw into the mix: Apple's clang has a default sysroot configured, so with the default system compiler, there is no way to replicate this "build without a sysroot" scenario as far as I can tell.  For the system compiler, I believe this behavior is a strict improvement.

No, apple's clang doesn't have a default sysroot. When you run `/usr/bin/clang`, which is a shim that calls `xcrun`, it finds the clang in your toolchain and invokes it with `SDKROOT` environment variable. That is the behavior of the shim, not the behavior of clang.


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https://reviews.llvm.org/D136315