[libcxx-commits] [libcxx] [libc++][CI] Tests the no RTTI configuration. (PR #65518)

[via libcxx-commits]

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@@ -370,6 +372,11 @@ if (LIBCXX_HAS_PTHREAD_API)
   endif()
 endif()
 
+if (NOT LIBCXX_ENABLE_RTTI AND LIBCXX_ENABLE_EXCEPTIONS)
+  message(FATAL_ERROR "The option LIBCXX_ENABLE_RTTI can not be turned off"
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EricWF wrote:

Why not? Clang will still emit RTTI for types which are thrown. `-fexceptions -fno-rtti` is a perfectly valid way to use the library. 

Though IDK if it makes sense to build a dylib in that configuration.

However, this option seems to control both how the library is built and how the test suite is run. And those should be separate. 

https://github.com/llvm/llvm-project/pull/65518