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configure: fix --enable-fuzzing linker failures 

With --enable-fuzzing, QEMU_CFLAGS include -fsanitize=fuzzer-no-link.
This should allow us to build non-fuzzer binaries using objects
instrumented for fuzzing. However, to do that, we also need to link with
-fsanitize=fuzzer-no-link. We were not doing that.

Reported-by: Li Qiang <liq3ea@163.com>,
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20210221174510.22542-1-alxndr@bu.edu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexander Bulekov 2021-02-21 12:45:10 -05:00 committed by Paolo Bonzini
parent 237377ac72
commit efce01bcb6
1 changed files with 10 additions and 0 deletions
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@ -6096,7 +6096,17 @@ if test "$fuzzing" = "yes" ; then
# If LIB_FUZZING_ENGINE is set, assume we are running on OSS-Fuzz, and the
# needed CFLAGS have already been provided
if test -z "${LIB_FUZZING_ENGINE+xxx}" ; then
# Add CFLAGS to tell clang to add fuzzer-related instrumentation to all the
# compiled code.
QEMU_CFLAGS="$QEMU_CFLAGS -fsanitize=fuzzer-no-link"
# To build non-fuzzer binaries with --enable-fuzzing, link everything with
# fsanitize=fuzzer-no-link. Otherwise, the linker will be unable to bind
# the fuzzer-related callbacks added by instrumentation.
QEMU_LDFLAGS="$QEMU_LDFLAGS -fsanitize=fuzzer-no-link"
# For the actual fuzzer binaries, we need to link against the libfuzzer
# library. Provide the flags for doing this in FUZZ_EXE_LDFLAGS. The meson
# rule for the fuzzer adds these to the link_args. They need to be
# configurable, to support OSS-Fuzz
FUZZ_EXE_LDFLAGS="-fsanitize=fuzzer"
else
FUZZ_EXE_LDFLAGS="$LIB_FUZZING_ENGINE"