Allow and fix LTO build

Signed-off-by: falkTX <falktx@falktx.com>

Makefile.base.mk

@@ -186,6 +186,11 @@ BASE_FLAGS += -DNDEBUG $(BASE_OPTS) -fvisibility=hidden
 CXXFLAGS   += -fvisibility-inlines-hidden
 endif
 
+ifeq ($(WITH_LTO),true)
+BASE_FLAGS += -fno-strict-aliasing -flto
+LINK_FLAGS += -fno-strict-aliasing -flto -Werror=odr -Werror=lto-type-mismatch
+endif
+
 BUILD_C_FLAGS   = $(BASE_FLAGS) -std=gnu99 $(CFLAGS)
 BUILD_CXX_FLAGS = $(BASE_FLAGS) -std=gnu++11 $(CXXFLAGS)
 LINK_FLAGS      = $(LINK_OPTS) $(LDFLAGS)

dgl/src/ApplicationPrivateData.hpp

@@ -30,12 +30,18 @@ typedef HANDLE d_ThreadHandle;
 typedef pthread_t d_ThreadHandle;
 #endif
 
+#ifdef DISTRHO_OS_MAC
 typedef struct PuglWorldImpl PuglWorld;
+#endif
 
 START_NAMESPACE_DGL
 
 class Window;
 
+#ifndef DISTRHO_OS_MAC
+typedef struct PuglWorldImpl PuglWorld;
+#endif
+
 // --------------------------------------------------------------------------------------------------------------------
 
 struct Application::PrivateData {