[Bug 215125] clang: Turning on sanitizer options causes the test for non-existent function mallinfo() to pass

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215125

            Bug ID: 215125
           Summary: clang: Turning on sanitizer options causes the test
                    for non-existent function mallinfo() to pass
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: yuri at rawbw.com

Created attachment 177764
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177764&action=edit
C test program: conftest.c

It fails without the sanitizer options:
> cc -o conftest -O2 -pipe -fno-omit-frame-pointer  -fstack-protector -fno-strict-aliasing -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Qunused-arguments -fstack-protector-all -Wstack-protector -fwrapv --param ssp-buffer-size=1 -fPIE -fasynchronous-unwind-tables -fno-omit-frame-pointer -I${top_srcdir}/src/common  -Wl,-rpath,/usr/local/lib -fstack-protector -pie -Wl,-z,relro -Wl,-z,now -rdynamic conftest.c -lpthread -lexecinfo

It succeeds with the sanitizer options:
> cc -o conftest -O2 -pipe -fno-omit-frame-pointer  -fstack-protector -fno-strict-aliasing -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Qunused-arguments -fstack-protector-all -Wstack-protector -fwrapv --param ssp-buffer-size=1 -fPIE -fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer -fasynchronous-unwind-tables -fno-omit-frame-pointer -I${top_srcdir}/src/common  -Wl,-rpath,/usr/local/lib -fstack-protector -pie -Wl,-z,relro -Wl,-z,now -rdynamic conftest.c -lpthread -lexecinfo

I found this during security/tor build on FreeBSD 11 amd64.

Sanitizer options shouldn't make such difference, and the test should always
fail because there is no such function.

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