@leroysheep / MovieWebApp / commits / 8fed3acc0b

meson: support building fuzzers with libFuzzer

To support fuzzing via libFuzzer one has to pass a couple of compiler options: - It is mandatory to enable the "fuzzer-no-link" sanitizer for coverage feedback. - It is recommended to enable at least one more sanitizer to catch issues, like the "address" sanitizer. - The fuzzing executables need to be linked with "-fsanitize=fuzzer" to wire up libFuzzer itself. The first two items can already be achieved via the "-Db_sanitize=" option. But the last item cannot easily be achieved, as we can only configure global link arguments. Introduce a new "-Dfuzzers_link_args=" build option to plug this gap. Add documentation so that users know how to set up libFuzzer. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Patrick Steinhardt committed Jul 3, 2026 at 14:58 UTC 8fed3acc0b54c267a86380c4369a535d68e50aae
3 files changed +18
meson.build
+15
index 11488623bf..cd871900c3 100644 --- a/meson.build +++ b/meson.build @@ -161,6 +161,21 @@ # These machine files can be passed to `meson setup` via the `--native-file` # option. # +# Fuzzing +# ======= +# +# Meson supports building the fuzzing targets by setting `-Dfuzzers=true`. By +# default, the targets will be built without libFuzzer and thus won't be usable +# for fuzzing. You have to configure a couple of options to properly wire up +# libFuzzer: +# +# $ meson setup build-fuzzers \ +# -Db_sanitize=address,fuzzer-no-link \ +# -Dfuzzers=true \ +# -Dfuzzers_link_args=-fsanitize=fuzzer +# $ meson compile -C build-fuzzers +# $ ./build-fuzzers/oss-fuzz/fuzz-config <args> +# # Cross compilation # ================= #
meson_options.txt
+2
index 659cbb218f..a59c91e86c 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -131,3 +131,5 @@ option('test_utf8_locale', type: 'string', description: 'Name of a UTF-8 locale used for testing.') option('fuzzers', type: 'boolean', value: false, description: 'Enable building fuzzers.') +option('fuzzers_link_args', type: 'array', value: [], + description: 'Linker arguments used to link fuzzers. Use -fsanitize=fuzzer for fuzzing.')
oss-fuzz/meson.build
+1
index 878afd8426..10bcac2f6d 100644 --- a/oss-fuzz/meson.build +++ b/oss-fuzz/meson.build @@ -16,5 +16,6 @@ foreach fuzz_program : fuzz_programs fuzz_program, ], dependencies: [libgit_commonmain], + link_args: get_option('fuzzers_link_args'), ) endforeach