[compiler-rt] [ubsan-minimal] Switch to weak symbols for callbacks to allow overriding in client code (PR #119242)

[Vitaly Buka via llvm-commits]

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@@ -20,20 +20,21 @@ static __sanitizer::atomic_uintptr_t caller_pcs[kMaxCallerPcs];
 // that "too many errors" has already been reported.
 static __sanitizer::atomic_uint32_t caller_pcs_sz;
 
-__attribute__((noinline)) static bool report_this_error(uintptr_t caller) {
+SANITIZER_INTERFACE_WEAK_DEF(void, __ubsan_report_error, uintptr_t caller,
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vitalybuka wrote:

maybe sinc into __ubsan_report_error
```
    char msg_buf[MSG_BUF_LEN(msg)] = MSG_TMPL(msg);              \
    decorate_msg(MSG_TMPL_END(msg_buf, msg), caller);            
```


https://github.com/llvm/llvm-project/pull/119242