[Bug 215455] AdressSanitizer provides memalign() confusing consumers

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215455

            Bug ID: 215455
           Summary: AdressSanitizer provides memalign() confusing
                    consumers
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-toolchain at FreeBSD.org
          Reporter: jbeich at FreeBSD.org

Some build systems test symbol availability without prototypes in case of
broken/incomplete headers or due to simplicity. For one, Firefox has
AC_CHECK_FUNCS(memalign) which fails on FreeBSD but defines HAVE_MEMALIGN with
ASan. The code can be unwrapped into the following:

  $ cat a.c
  char memalign();

  int main()
  {
      memalign();
      return 0;
  }

  $ cc a.c -fsanitize=address
  $ echo $?
  0

  $ cc a.c
  /tmp/a-294bd8.o: In function `main':
  a.c:(.text+0x12): undefined reference to `memalign'
  $ echo $?
  1

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