[libc-commits] [libc] [libc] [doc] explain the need of `clang` (PR #74855)

[Schrodinger ZHU Yifan via libc-commits]

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@@ -60,9 +60,12 @@ to use the freshly built lld and compiler-rt.
 We will go over some of the special options passed to the ``cmake`` command
 above.
 
-* **Enabled Projects** - Since we want to build and install clang, lld
-  and compiler-rt along with the libc, we specify
-  ``clang;libc;lld;compiler-rt`` as the list of enabled projects.
+* **Enabled Projects** - Since we want to build and install ``clang``, ``lld``
+  and ``compiler-rt`` along with the ``libc``, we specify
+  ``clang;libc;lld;compiler-rt`` as the list of enabled projects. ``clang`` is 
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SchrodingerZhu wrote:

> Is compiler-rt a runtimes project?

I think so.

> the only dependency I was aware of was the hdr-gen tool

I tried build without `clang`, but somehow it complains about missing symbols from my system LLVM.

https://github.com/llvm/llvm-project/pull/74855