[libcxx-commits] [libcxx] [llvm] [libc++] Add support for picolibc and newlib in RUNTIMES_USE_LIBC (PR #147956)

[Nikolas Klauser via libcxx-commits]

================
@@ -42,6 +42,10 @@
 // Hardening.
 #cmakedefine _LIBCPP_HARDENING_MODE_DEFAULT @_LIBCPP_HARDENING_MODE_DEFAULT@
 
+// C libraries
+#cmakedefine01 _LIBCXX_LIBC_PICOLIBC
----------------
philnik777 wrote:

```suggestion
#cmakedefine01 _LIBCPP_LIBC_PICOLIBC
```
I don't think we use `_LIBCXX` anywhere else.

https://github.com/llvm/llvm-project/pull/147956