[PATCH v2] fuzz: add oss-fuzz build.sh script

[Alexander Bulekov <alxndr@bu.edu>]

It is neater to keep this in the QEMU repo, since any change that
requires an update to the oss-fuzz build configuration, can make the
necessary changes in the same series.

Suggested-by: Philippe Mathieu-Daude <f4bug@amsat.org>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
---

v2 updates the script header comment.

 scripts/oss-fuzz/build.sh | 50 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100755 scripts/oss-fuzz/build.sh

diff --git a/scripts/oss-fuzz/build.sh b/scripts/oss-fuzz/build.sh
new file mode 100755
index 0000000000..e93d6f2e03
--- /dev/null
+++ b/scripts/oss-fuzz/build.sh
@@ -0,0 +1,50 @@
+#!/bin/sh
+#
+# OSS-Fuzz build script. See:
+# https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh
+#
+# This code is licensed under the GPL version 2 or later.  See
+# the COPYING file in the top-level directory.
+#
+
+# build project
+# e.g.
+# ./autogen.sh
+# ./configure
+# make -j$(nproc) all
+
+# build fuzzers
+# e.g.
+# $CXX $CXXFLAGS -std=c++11 -Iinclude \
+#     /path/to/name_of_fuzzer.cc -o $OUT/name_of_fuzzer \
+#     $LIB_FUZZING_ENGINE /path/to/library.a
+
+mkdir -p $OUT/lib/              # Shared libraries
+
+# Build once to get the list of dynamic lib paths, and copy them over
+./configure --datadir="./data/" --disable-werror --cc="$CC" --cxx="$CXX" \
+    --extra-cflags="$CFLAGS -U __OPTIMIZE__ "
+make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" -j$(nproc) i386-softmmu/fuzz
+
+for i in $(ldd ./i386-softmmu/qemu-fuzz-i386  | cut -f3 -d' '); do 
+    cp $i $OUT/lib/
+done
+rm ./i386-softmmu/qemu-fuzz-i386
+
+# Build a second time to build the final binary with correct rpath
+./configure --datadir="./data/" --disable-werror --cc="$CC" --cxx="$CXX" \
+    --extra-cflags="$CFLAGS -U __OPTIMIZE__" \
+    --extra-ldflags="-Wl,-rpath,'\$\$ORIGIN/lib'"
+make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" -j$(nproc) i386-softmmu/fuzz
+
+# Copy over the datadir
+cp  -r ./pc-bios/ $OUT/pc-bios
+
+# Run the fuzzer with no arguments, to print the help-string and get the list
+# of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according
+# to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using
+# executable name)
+for target in $(./i386-softmmu/qemu-fuzz-i386 | awk '$1 ~ /\*/  {print $2}');
+do
+    cp ./i386-softmmu/qemu-fuzz-i386 $OUT/qemu-fuzz-i386-target-$target
+done
-- 
2.26.2