HaikuOS build fixes, headless mode works

src/CardinalPlugin.cpp

@@ -380,6 +380,9 @@ void CardinalPluginContext::writeMidiMessage(const rack::midi::Message& message,
             break;
         }
         break;
+    default:
+        // invalid
+        return;
     }
 
     DISTRHO_SAFE_ASSERT_RETURN(size >= event.size,);

src/Makefile

@@ -32,6 +32,10 @@ else
 BASE_FLAGS += -DARCH_LIN
 endif
 
+ifeq ($(HAIKU),true)
+BASE_FLAGS += -I../include/haiku-compat
+endif
+
 BASE_FLAGS += -fno-strict-aliasing
 BASE_FLAGS += -DPRIVATE=
 BASE_FLAGS += -I../dpf/dgl/src/nanovg
@@ -70,12 +74,16 @@ ifeq ($(BSD),true)
 BASE_FLAGS += -DCLOCK_MONOTONIC_RAW=CLOCK_MONOTONIC_PRECISE
 endif
 
+ifeq ($(HAIKU),true)
+BASE_FLAGS += -DCLOCK_MONOTONIC_RAW=CLOCK_MONOTONIC
+endif
+
 ifeq ($(WASM),true)
 BASE_FLAGS += -DNANOVG_GLES2=1
 BASE_FLAGS += -msse -msse2 -msse3 -msimd128
 # FIXME
 BASE_FLAGS += -DRTLD_DEEPBIND=0
-else
+else ifneq ($(HAIKU),true)
 BASE_FLAGS += -pthread
 endif
 

src/Makefile.cardinal.mk

@@ -146,7 +146,6 @@ endif
 BASE_FLAGS += -I../Rack/dep/glfw/include
 BASE_FLAGS += -I../Rack/dep/nanosvg/src
 BASE_FLAGS += -I../Rack/dep/oui-blendish
-BASE_FLAGS += -pthread
 
 ifeq ($(HEADLESS),true)
 BASE_FLAGS += -DHEADLESS
@@ -159,7 +158,7 @@ endif
 ifeq ($(WASM),true)
 BASE_FLAGS += -DNANOVG_GLES2=1
 BASE_FLAGS += -msse -msse2 -msse3 -msimd128
-else
+else ifneq ($(HAIKU),true)
 BASE_FLAGS += -pthread
 endif
 
@@ -183,7 +182,11 @@ BASE_FLAGS += -Wno-unused-variable
 # --------------------------------------------------------------
 # extra linker flags
 
+ifeq ($(HAIKU),true)
+LINK_FLAGS += -lpthread
+else
 LINK_FLAGS += -pthread
+endif
 
 ifneq ($(HAIKU_OR_MACOS_OR_WINDOWS),true)
 ifneq ($(STATIC_BUILD),true)