mirror of
https://github.com/firebase/firebase-ios-sdk
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Mina Farid
af0e5fca4c
* Detect OSS Fuzz thorough `LIB_FUZZING_ENGINE` env var. * Avoid building libFuzzer if not fuzzing. * Load the fuzzing library either from the library provided by OSS Fuzz or from libFuzzer.a that was manually built from sources.
55 lines
2.2 KiB
CMake
55 lines
2.2 KiB
CMake
# Copyright 2018 Google
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Add fuzz testing options to the current build.
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include(compiler_id)
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option(FUZZING "Build for Fuzz Testing (local fuzzing and OSS Fuzz)" OFF)
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# Assume OSS Fuzz if LIB_FUZZING_ENGINE environment variable is set. OSS Fuzz
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# provides its required compiler-specific flags in CXXFLAGS, which are
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# automatically added to CMAKE_CXX_FLAGS. For local fuzzing, multiple compile
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# and linking flags must be set. These flags depend on the compiler version.
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if(FUZZING AND NOT DEFINED ENV{LIB_FUZZING_ENGINE})
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if(WIN32)
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# Currently, libFuzzer cannot be built on Windows.
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message(FATAL_ERROR "Fuzzing is currently not supported on Windows.")
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endif()
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# Address sanitizer must be enabled during fuzzing to detect memory errors.
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if(NOT WITH_ASAN)
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message(FATAL_ERROR "Fuzzing requires WITH_ASAN=ON to detect memory errors.")
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endif()
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# Set the flag to enable code coverage instrumentation. Fuzzing engines use
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# code coverage as a metric to guide the fuzzing. We use the basic code
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# coverage level (trace-pc). This flag has different values in Clang and GNU.
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# Other values, such as trace-cmp, can be used to trace data flow. See the
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# official documentation for the compiler flags.
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if(CXX_CLANG)
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# TODO(minafarid): Check the version of Clang. Clang versions >= 5.0 should
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# have libFuzzer by default.
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set(fuzzing_flags -fsanitize-coverage=trace-pc-guard)
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elseif(CXX_GNU)
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set(fuzzing_flags -fsanitize-coverage=trace-pc)
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else()
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message(FATAL_ERROR "Only Clang and GCC support fuzzing.")
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endif()
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foreach(flag ${fuzzing_flags})
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}")
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endforeach()
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endif()
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