Compile with -fvisibility-inlines-hidden to reduce
the amount of exported symbols that we need to take
care of in the .symbols file.
--- a/Qt4Pas.pro
+++ b/Qt4Pas.pro
@@ -19,6 +19,8 @@
 MOC_DIR = tmp
 OBJECTS_DIR = tmp
 
+QMAKE_CXXFLAGS += -fvisibility-inlines-hidden
+
 # Match Intel x86_64 i686 i586 i386 x86 ...
 is86 = $$find(QMAKE_HOST.arch, ".*86")
 # Match 64 bit