fix cc invocations to use provided methods

This may help non-gnu style CLIs work.

Author: nagisa

Cargo.toml

@@ -12,7 +12,7 @@ version = "0.4.8"
 arbitrary = "1"
 
 [build-dependencies]
-cc = { version = "1.0", features = ["parallel"] }
+cc = { version = "1.0.83", features = ["parallel"] }
 
 [features]
 default = ["link_libfuzzer"]

build.rs

@@ -31,10 +31,10 @@ fn build_and_link_libfuzzer() {
             println!("cargo:rerun-if-changed={}", source.display());
             build.file(source.to_str().unwrap());
         }
-        build.flag("-std=c++17");
-        build.flag("-fno-omit-frame-pointer");
-        build.flag("-w");
         build.cpp(true);
+        build.std("c++17");
+        build.force_frame_pointer(true);
+        build.warnings(false);
         build.compile("libfuzzer.a");
     }
 }