[libc-commits] [libc] [libc] Support configurable errno modes (PR #98287)

[Petr Hosek via libc-commits]

================
@@ -1,4 +1,10 @@
 {
+  "errno": {
+    "LIBC_CONF_ERRNO_MODE": {
+      "value": "",
----------------
petrhosek wrote:

I agree but the problem is that we currently don't have any mechanism to distinguish the overlay from the full build mode, and in the overlay mode we want to default to `LIBC_ERRNO_MODE_SYSTEM`.

https://github.com/llvm/llvm-project/pull/98287