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fuzz: enable running fuzz test cases in Debug mode

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When building with

 BUILD_FOR_FUZZING=OFF
 BUILD_FUZZ_BINARY=ON
 CMAKE_BUILD_TYPE=Debug

allow the fuzz binary to execute given test cases (without actual
fuzzing) to make it easier to reproduce fuzz test failures in a more
normal debug build.

In Debug builds, deterministic fuzz behaviour is controlled via a runtime
variable, which is normally false, but set to true automatically in the
fuzz binary, unless the FUZZ_NONDETERMINISM environment variable is set.
This commit is contained in:
Anthony Towns
2025-03-22 01:02:13 +10:00
parent 639279e86a
commit c1d01f59ac
6 changed files with 48 additions and 16 deletions
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12
src/test/fuzz/fuzz.cpp
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@@ -147,10 +147,18 @@ static void initialize()
std::cerr << "No fuzz target compiled for " << g_fuzz_target << "." << std::endl;
std::exit(EXIT_FAILURE);
}
if constexpr (!G_FUZZING) {
std::cerr << "Must compile with -DBUILD_FOR_FUZZING=ON to execute a fuzz target." << std::endl;
if constexpr (!G_FUZZING_BUILD && !G_ABORT_ON_FAILED_ASSUME) {
std::cerr << "Must compile with -DBUILD_FOR_FUZZING=ON or in Debug mode to execute a fuzz target." << std::endl;
std::exit(EXIT_FAILURE);
}
if (!EnableFuzzDeterminism()) {
if (std::getenv("FUZZ_NONDETERMINISM")) {
std::cerr << "Warning: FUZZ_NONDETERMINISM env var set, results may be inconsistent with fuzz build" << std::endl;
} else {
g_enable_dynamic_fuzz_determinism = true;
assert(EnableFuzzDeterminism());
}
}
Assert(!g_test_one_input);
g_test_one_input = &it->second.test_one_input;
it->second.opts.init();