KVM: selftests: Explicitly disable builtins for mem*() overrides
authorSean Christopherson <seanjc@google.com>
Tue, 13 Dec 2022 00:16:48 +0000 (00:16 +0000)
committerPaolo Bonzini <pbonzini@redhat.com>
Tue, 27 Dec 2022 11:00:48 +0000 (06:00 -0500)
commit7cf2e7373ab145bf972c3cbcb495fd1a9770c3b0
treed2308e0e1f27a55f9d007a00856b5bdc0ad23224
parent2b2d8afc1acf6396bea14ef973d0029c4a5b33f4
KVM: selftests: Explicitly disable builtins for mem*() overrides

Explicitly disable the compiler's builtin memcmp(), memcpy(), and
memset().  Because only lib/string_override.c is built with -ffreestanding,
the compiler reserves the right to do what it wants and can try to link the
non-freestanding code to its own crud.

  /usr/bin/x86_64-linux-gnu-ld: /lib/x86_64-linux-gnu/libc.a(memcmp.o): in function `memcmp_ifunc':
  (.text+0x0): multiple definition of `memcmp'; tools/testing/selftests/kvm/lib/string_override.o:
  tools/testing/selftests/kvm/lib/string_override.c:15: first defined here
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

Fixes: 6b6f71484bf4 ("KVM: selftests: Implement memcmp(), memcpy(), and memset() for guest use")
Reported-by: Aaron Lewis <aaronlewis@google.com>
Reported-by: Raghavendra Rao Ananta <rananta@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221213001653.3852042-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
tools/testing/selftests/kvm/Makefile