[libcxx-commits] [libcxx] [libc++][hardening] Check that `_LIBCPP_HARDENING_MODE_DEFAULT` is defined (PR #80353)

[Louis Dionne via libcxx-commits]

================
@@ -325,6 +325,11 @@
 // clang-format on
 
 #  ifndef _LIBCPP_HARDENING_MODE
+
+#    ifndef _LIBCPP_HARDENING_MODE_DEFAULT
+#      error _LIBCPP_HARDENING_MODE_DEFAULT is not defined.
----------------
ldionne wrote:

I would say something like `This definition should be set at configuration-time in the __config_site header, please ensure your installation of libc++ is not broken` -- or something like that. WDYT?

https://github.com/llvm/llvm-project/pull/80353