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

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxx

Author: Konstantin Varlamov (var-const)

<details>
<summary>Changes</summary>

If the `_LIBCPP_HARDENING_MODE_DEFAULT` macro is not defined, `_LIBCPP_HARDENING_MODE` will be considered defined but fail the check for a valid hardening mode, resulting in a slightly less understandable error (that error is really meant more to prevent users from passing incorrect values such as `0` or `1` directly rather than catching configuration issues).

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


1 Files Affected:

- (modified) libcxx/include/__config (+5) 


``````````diff
diff --git a/libcxx/include/__config b/libcxx/include/__config
index d356960e9e62b..2101490c3a8c5 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -325,6 +325,11 @@
 // clang-format on
 
 #  ifndef _LIBCPP_HARDENING_MODE
+
+#    ifndef _LIBCPP_HARDENING_MODE_DEFAULT
+#      error _LIBCPP_HARDENING_MODE_DEFAULT is not defined.
+#    endif
+
 #    define _LIBCPP_HARDENING_MODE _LIBCPP_HARDENING_MODE_DEFAULT
 #  endif
 

``````````

</details>


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