build: improve -fsanitize-coverage-allowlist check

The sancov filter check still fails when unused arguments are treated as
errors. To work around that, add a SanitizerCoverage flag to the
build-check.

Fixes: aa4f3a3b88 ("build: fix check for -fsanitize-coverage-allowlist")
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20220621204507.698711-1-alxndr@bu.edu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/meson.build b/meson.build
index bc5569ace159044f82cb40b5f5f0206e2b58ac77..013c694a491db0d9db17e24dd62c215b22d6d20a 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -212,7 +212,8 @@ if get_option('fuzzing')
 
   if cc.compiles('int main () { return 0; }',
                   name: '-fsanitize-coverage-allowlist=/dev/null',
-                 args: ['-fsanitize-coverage-allowlist=/dev/null'] )
+                 args: ['-fsanitize-coverage-allowlist=/dev/null',
+                        '-fsanitize-coverage=trace-pc'] )
     add_global_arguments('-fsanitize-coverage-allowlist=instrumentation-filter',
                          native: false, language: ['c', 'cpp', 'objc'])
   endif