ICU-5799 Add options to hide some library functions for future reference.

These options are commented out until U_CAPI can import and export as needed.

X-SVN-Rev: 22358

icu4c/source/common/unicode/platform.h.in

@@ -276,6 +276,8 @@ typedef unsigned int uint32_t;
 
 #if @U_USE_GCC_VISIBILITY_ATTRIBUTE@
 #define U_EXPORT __attribute__((visibility("default")))
+/*#elif defined(__HP_aCC) || defined(__HP_cc)
+#define U_EXPORT __declspec(dllexport)*/
 #else
 #define U_EXPORT
 #endif

icu4c/source/config/mh-hpux-acc

@@ -27,6 +27,10 @@ THREADSCPPFLAGS = -D_REENTRANT -D_THREAD_SAFE
 CFLAGS += -Ae +ESlit
 CXXFLAGS += +W740 +W749 +W823 +W4232
 
+# -Bhidden_def Hides all symbols defined in the module.
+#LIBCFLAGS = -Bhidden_def
+#LIBCXXFLAGS = -Bhidden_def
+
 ## Commands to compile
 COMPILE.c=	$(CC) $(DEFS) $(CPPFLAGS) $(CFLAGS) -c
 COMPILE.cc=	$(CXX) $(DEFS) $(CPPFLAGS) $(CXXFLAGS) -c