optimal afl++ defaults (#5129)

* optimal afl++ defaults

* fixes

1 files changed, 32 insertions, 0 deletions

diff --git a/projects/libreoffice/build.sh b/projects/libreoffice/build.sh
index cec8368db..22320f1e9 100755
--- a/projects/libreoffice/build.sh
+++ b/projects/libreoffice/build.sh
@@ -1,3 +1,35 @@
 #!/bin/bash -eu
+# Copyright 2021 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+# afl++ workaround, as afl-clang-fast does not work yet.
+test -n "$AFL_MAP_SIZE" && {
+  export CC=clang
+  export CXX=clang++
+  AFL_FLAGS="-fsanitize-coverage=trace-pc-guard"
+  # Future: enable 40% chance for cmplog lite
+  # rm -f $WORK/afl_cmplog
+  # test $(($RANDOM % 10)) -lt 4 && {
+  #   AFL_FLAGS="$AFL_FLAGS,trace-cmp"
+  #   touch $WORK/afl_cmplog
+  # }
+  export CFLAGS="$AFL_FLAGS $CFLAGS"
+  export CXXFLAGS="$AFL_FLAGS $CXXFLAGS"
+  rm -f $LIB_FUZZING_ENGINE
+  ar ru $LIB_FUZZING_ENGINE $SRC/aflplusplus/afl-compiler-rt.o $SRC/aflplusplus/utils/aflpp_driver/aflpp_driver.o || exit 1
+}
 
 $SRC/libreoffice/bin/oss-fuzz-build.sh