[libc] Add implementation of errno and define the other macros of errno.h.
Reviewers: stanshebs, alexbrachet
Subscribers: mgorny, MaskRay, tschuett, libc-commits
Tags: #libc-project
Differential Revision: https://reviews.llvm.org/D71094
diff --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index 00df588..f9a86af 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -1,4 +1,5 @@
-add_subdirectory(string)
+add_subdirectory(errno)
add_subdirectory(math)
+add_subdirectory(string)
add_subdirectory(__support)
