1# Copyright 2020 The Pigweed Authors 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); you may not 4# use this file except in compliance with the License. You may obtain a copy of 5# the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12# License for the specific language governing permissions and limitations under 13# the License. 14 15import("//build_overrides/pigweed.gni") 16 17import("$dir_pw_build/target_types.gni") 18import("$dir_pw_docgen/docs.gni") 19import("$dir_pw_fuzzer/fuzzer.gni") 20 21config("public_include_path") { 22 include_dirs = [ "public" ] 23 visibility = [ ":*" ] 24} 25 26# Add flags for adding LLVM sanitizer coverage for fuzzing. This is added by 27# the host_clang_fuzz toolchains. 28config("instrumentation") { 29 if (pw_toolchain_OSS_FUZZ_ENABLED) { 30 # OSS-Fuzz manipulates compiler flags directly. See 31 # google.github.io/oss-fuzz/getting-started/new-project-guide/#Requirements. 32 cflags_c = string_split(getenv("CFLAGS")) 33 cflags_cc = string_split(getenv("CXXFLAGS")) 34 35 # OSS-Fuzz sets "-stdlib=libc++", which conflicts with the "-nostdinc++" set 36 # by `pw_minimal_cpp_stdlib`. 37 cflags_cc += [ "-Wno-unused-command-line-argument" ] 38 } else { 39 cflags = [ "-fsanitize=fuzzer-no-link" ] 40 } 41} 42 43# Add flags for linking against compiler-rt's libFuzzer. This is added 44# automatically by `pw_fuzzer`. 45config("engine") { 46 if (pw_toolchain_OSS_FUZZ_ENABLED) { 47 # OSS-Fuzz manipulates linker flags directly. See 48 # google.github.io/oss-fuzz/getting-started/new-project-guide/#Requirements. 49 ldflags = string_split(getenv("LDFLAGS")) + [ getenv("LIB_FUZZING_ENGINE") ] 50 } else { 51 ldflags = [ "-fsanitize=fuzzer" ] 52 } 53} 54 55pw_source_set("pw_fuzzer") { 56 public_configs = [ ":public_include_path" ] 57 public = [ 58 "public/pw_fuzzer/asan_interface.h", 59 "public/pw_fuzzer/fuzzed_data_provider.h", 60 ] 61 public_deps = [ "$dir_pw_log" ] 62} 63 64pw_source_set("run_as_unit_test") { 65 configs = [ ":public_include_path" ] 66 sources = [ "pw_fuzzer_disabled.cc" ] 67 deps = [ 68 dir_pw_log, 69 dir_pw_unit_test, 70 ] 71} 72 73# See https://llvm.org/docs/LibFuzzer.html#fuzzer-friendly-build-mode 74config("fuzzing_build_mode_unsafe_for_production") { 75 defines = [ "FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION" ] 76} 77 78config("fuzzing_verbose_logging") { 79 defines = [ "FUZZING_VERBOSE_LOGGING" ] 80} 81 82pw_doc_group("docs") { 83 inputs = [ "doc_resources/pw_fuzzer_coverage_guided.png" ] 84 sources = [ "docs.rst" ] 85} 86 87# Sample fuzzer 88pw_fuzzer("toy_fuzzer") { 89 sources = [ "examples/toy_fuzzer.cc" ] 90 deps = [ 91 ":pw_fuzzer", 92 dir_pw_status, 93 ] 94} 95 96pw_test_group("tests") { 97 tests = [ ":toy_fuzzer_test" ] 98} 99 100group("fuzzers") { 101 deps = [ ":toy_fuzzer" ] 102} 103
