[compiler-rt] [asan] Enable exceptions for asan_new_delete.cpp translation unit (PR #200719)

[David Justo via llvm-commits]

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@@ -143,6 +143,19 @@ set(ASAN_DYNAMIC_CFLAGS ${ASAN_CFLAGS})
 append_list_if(COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC
   -ftls-model=initial-exec ASAN_DYNAMIC_CFLAGS)
 
+# asan_new_delete.cpp throws std::bad_alloc, so the translation units that
+# build it need -fexceptions and access to <new> (drop -nostdinc++). Only
+# the C++ slices (RTAsan_cxx in the static build and RTAsan_dynamic_cxx in
+# the dynamic build) opt into these flags — the rest of the runtime keeps
+# -fno-exceptions / -nostdinc++.
+set(ASAN_CXX_CFLAGS ${ASAN_CFLAGS})
+list(REMOVE_ITEM ASAN_CXX_CFLAGS -fno-exceptions -nostdinc++)
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davidmrdavid wrote:

When I first left this comment, I did not realize the CMake test would prevent this breaking MSVC. Resolving this comment.

https://github.com/llvm/llvm-project/pull/200719