[flang-commits] [flang] [flang] Document DEFAULT_SYSROOT usage on Darwin (PR #77353)

[Leandro Lupori via flang-commits]

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@@ -88,6 +88,10 @@ cmake \
 ninja
 ```
 
+On Darwin, to make flang able to link binaries with the default sysroot without
+having to specify additional flags, use the `DEFAULT_SYSROOT` cmake flag, e.g.
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luporl wrote:

I missed this one. Fixed on a follow up commit.

https://github.com/llvm/llvm-project/pull/77353