Audio: ignore command-line options not related to audio.

src/Magnum/Audio/Context.cpp

@@ -125,7 +125,8 @@ Context& Context::current() {
 Context::Context(Int argc, const char** argv): Context(Configuration{}, argc, argv) {}
 
 Context::Context(NoCreateT, Int argc, const char** argv) noexcept: _device{}, _context{} {
-    Utility::Arguments args{"magnum"};
+    Utility::Arguments args{"magnum",
+        Utility::Arguments::Flag::IgnoreUnknownOptions};
     args.addOption("log", "default").setHelp("log", "console logging", "default|quiet|verbose")
         .setFromEnvironment("log")
         .parse(argc, argv);

src/Magnum/Audio/Context.h

@@ -105,6 +105,10 @@ Note that all options are prefixed with `--magnum-` to avoid conflicts with
 options passed to the application itself. Options that don't have this prefix
 are completely ignored, see documentation of the
 @ref Utility-Arguments-delegating "Utility::Arguments" class for details.
+Moreover, `--magnum`-prefixed options unrelated to audio (such as those defined
+by @ref GL-Context-command-line "GL::Context") are ignored as well. In order to
+provide a complete help and command-line argument diagnostic, you should
+instantiate this class *after* @ref GL::Context.
  */
 class MAGNUM_AUDIO_EXPORT Context {
     public:

src/Magnum/Audio/Test/ContextALTest.cpp

@@ -40,6 +40,7 @@ struct ContextALTest: TestSuite::Tester {
     void constructMove();
 
     void quietLog();
+    void ignoreUnrelatedOptions();
 
     void extensionsString();
     void isExtensionEnabled();
@@ -51,7 +52,8 @@ ContextALTest::ContextALTest() {
 
     addInstancedTests({&ContextALTest::quietLog}, 2);
 
-    addTests({&ContextALTest::extensionsString,
+    addTests({&ContextALTest::ignoreUnrelatedOptions,
+              &ContextALTest::extensionsString,
               &ContextALTest::isExtensionEnabled});
 }
 
@@ -90,6 +92,13 @@ void ContextALTest::quietLog() {
     CORRADE_COMPARE(out.str().empty(), bool(testCaseInstanceId()));
 }
 
+void ContextALTest::ignoreUnrelatedOptions() {
+    const char* argv[] = { "", "--magnum-gpu-validation", "on" };
+
+    Context context{Containers::arraySize(argv), argv};
+    CORRADE_VERIFY(Context::hasCurrent());
+}
+
 void ContextALTest::extensionsString() {
     Context context;