[nanopb] Move build script to project repository (#4640)

projects/nanopb/build.sh

@@ -15,45 +15,6 @@
 #
 ################################################################################
 
-cd $SRC/nanopb/tests
-
-# Build seed corpus.
-# Generating it here ensures it will contain all of the fields in the AllTypes
-# test case. The generators are built without fuzzing instrumentation.
-rm -rf build
-scons build/alltypes/encode_alltypes build/fuzztest/generate_message
-mkdir fuzztest_seed_corpus
-build/alltypes/encode_alltypes 0 > fuzztest_seed_corpus/alltypes0
-build/alltypes/encode_alltypes 1 > fuzztest_seed_corpus/alltypes1
-build/alltypes/encode_alltypes 2 > fuzztest_seed_corpus/alltypes2
-build/fuzztest/generate_message $(date +%s) > fuzztest_seed_corpus/rndmsg 2>/dev/null
-for f in fuzztest_seed_corpus/*; do
-    mv $f fuzztest_seed_corpus/$(sha1sum $f | cut -f 1 -d ' ')
-done
-zip -r "$OUT/corpus.zip" fuzztest_seed_corpus
-
-# Build the fuzz testing stubs with instrumentation
-rm -rf build
-
-FUZZERS="build/fuzztest/fuzztest_proto2_static
-         build/fuzztest/fuzztest_proto2_pointer
-         build/fuzztest/fuzztest_proto3_static
-         build/fuzztest/fuzztest_proto3_pointer
-         build/fuzztest/fuzztest_io_errors"
-
-scons CC="$CC" CXX="$CXX" LINK="$CXX" \
-      CCFLAGS="-Wall -Wextra -g -DLLVMFUZZER $CFLAGS" \
-      CXXFLAGS="-Wall -Wextra -g -DLLVMFUZZER $CXXFLAGS" \
-      NODEFARGS="1" \
-      LINKFLAGS="-std=c++11 $CXXFLAGS" \
-      LINKLIBS="$LIB_FUZZING_ENGINE" $FUZZERS
-
-cp $FUZZERS "$OUT"
-
-# The fuzzer test cases are closely related, so use the same seed corpus
-# for all of them.
-for fuzzer in $FUZZERS
-    do cp "$OUT/corpus.zip" "$OUT/$(basename $fuzzer)_seed_corpus.zip"
-done
-rm "$OUT/corpus.zip"
+# Build script is integrated to nanopb repository.
+source $SRC/nanopb/tests/fuzztest/ossfuzz.sh