meson: wire up fuzzers

Meson does not yet know to build our fuzzers. Introduce a new build
option "fuzzers" and wire up the fuzzers in case it is enabled. Adapt
our CI jobs so that they build the fuzzers by default.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ci/run-build-and-tests.sh

@@ -53,7 +53,8 @@ case "$jobname" in
 *-meson)
 	group "Configure" meson setup build . \
 		--warnlevel 2 --werror \
-		--wrap-mode nofallback
+		--wrap-mode nofallback \
+		-Dfuzzers=true
 	group "Build" meson compile -C build --
 	if test -n "$run_tests"
 	then

meson.build

@@ -1906,6 +1906,10 @@ if get_option('tests')
   subdir('t')
 endif
 
+if get_option('fuzzers')
+  subdir('oss-fuzz')
+endif
+
 subdir('bin-wrappers')
 if get_option('docs') != []
   subdir('Documentation')

meson_options.txt

@@ -95,3 +95,5 @@ option('tests', type: 'boolean', value: true,
   description: 'Enable building tests. This requires Perl, but is separate from the "perl" option such that you can build tests without Perl features enabled.')
 option('test_output_directory', type: 'string',
   description: 'Path to the directory used to store test outputs')
+option('fuzzers', type: 'boolean', value: false,
+  description: 'Enable building fuzzers.')

oss-fuzz/meson.build

@@ -0,0 +1,20 @@
+fuzz_programs = [
+  'fuzz-commit-graph.c',
+  'fuzz-config.c',
+  'fuzz-credential-from-url-gently.c',
+  'fuzz-date.c',
+  'fuzz-pack-headers.c',
+  'fuzz-pack-idx.c',
+  'fuzz-parse-attr-line.c',
+  'fuzz-url-decode-mem.c',
+]
+
+foreach fuzz_program : fuzz_programs
+  executable(fs.stem(fuzz_program),
+    sources: [
+      'dummy-cmd-main.c',
+      fuzz_program,
+    ],
+    dependencies: [libgit, common_main],
+  )
+endforeach