How to detect when -fsanitize=memory is in effect?

[nolo...@gmail.com]

We support a number of compilers going back to the late 1990s. I'm trying to guard similar to the following code:

  #include <sanitizer/msan_interface.h>
  ...

  __msan_unpoison(&readfds, sizeof(readfds));
  __msan_unpoison(&writefds, sizeof(writefds));

I don't see a preprocessor macro I can use to guard it:

  $ clang -dM -E -fsanitize=memory - </dev/null | egrep -i 'memory|sanitize|msan'
  $

How can I guard the additional instrumentation?

Thanks in advance,

[Konstantin Serebryany]

You need this: 

http://clang.llvm.org/docs/MemorySanitizer.html#has-feature-memory-sanitizer

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