Check explicitly for function names and link directly to them on iOS

When building the iOS app with optimisation (using the Release
configurtaion), the linker will not include functions even if they
have been marked with __attribute__ ((visibility("default"))). To get
such a function included, you need an actual reference to it.

Sure, I could probably do some other trick instead. Or I could use a
table and loop here instead of a sequence of if statements. Later.

Change-Id: I86fa38838f242fd1ac251da6e3885f5b166963d3

include/vcl/builderfactory.hxx

@@ -37,6 +37,9 @@
         rRet = VclPtr<typeName>::Create(pParent,wb); \
     }
 
+#define VCL_BUILDER_FACTORY_EXTERN(typeName) \
+    extern "C" void make##typeName(VclPtr<vcl::Window> & rRet, VclPtr<vcl::Window> & pParent, VclBuilder::stringmap & rMap)
+
 #endif
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

vcl/source/window/builder.cxx

@@ -20,6 +20,7 @@
 #include <sal/log.hxx>
 #include <unotools/resmgr.hxx>
 #include <vcl/builder.hxx>
+#include <vcl/builderfactory.hxx>
 #include <vcl/button.hxx>
 #include <vcl/dialog.hxx>
 #include <vcl/edit.hxx>
@@ -1488,6 +1489,15 @@ void VclBuilder::preload()
 #endif // DISABLE_DYNLOADING
 }
 
+#if defined DISABLE_DYNLOADING && !HAVE_FEATURE_DESKTOP
+
+VCL_BUILDER_FACTORY_EXTERN(CustomPropertiesControl);
+VCL_BUILDER_FACTORY_EXTERN(RefButton);
+VCL_BUILDER_FACTORY_EXTERN(RefEdit);
+VCL_BUILDER_FACTORY_EXTERN(ScRefButtonEx);
+
+#endif
+
 VclPtr<vcl::Window> VclBuilder::makeObject(vcl::Window *pParent, const OString &name, const OString &id,
     stringmap &rMap)
 {
@@ -2040,12 +2050,22 @@ VclPtr<vcl::Window> VclBuilder::makeObject(vcl::Window *pParent, const OString &
             }
             else
                 pFunction = reinterpret_cast<customMakeWidget>(aI->second->getFunctionSymbol(sFunction));
+#elif !HAVE_FEATURE_DESKTOP
+            if (false)
+                ; // Just so that all the other condition line pairs look the same
+            else if (sFunction == "makeCustomPropertiesControl")
+                pFunction = makeCustomPropertiesControl;
+            else if (sFunction == "makeRefButton")
+                pFunction = makeRefButton;
+            else if (sFunction == "makeRefEdit")
+                pFunction = makeRefEdit;
+            else if (sFunction == "makeScRefButtonEx")
+                pFunction = makeScRefButtonEx;
+
+            SAL_WARN_IF(!pFunction, "vcl.layout", "Missing case for " << sFunction);
+            assert(pFunction);
 #else
             pFunction = reinterpret_cast<customMakeWidget>(osl_getFunctionSymbol((oslModule) RTLD_DEFAULT, sFunction.pData));
-#if !HAVE_FEATURE_DESKTOP
-            SAL_WARN_IF(!pFunction, "vcl.layout", "Lookup of " << sFunction << " failed");
-            assert(pFunction);
-#endif
 #endif
             if (pFunction)
             {