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Hidden virtual functions in cxxabi.h.

Subject: Hidden virtual functions in cxxabi.h.
From: Steve Checkoway <email@hidden>
Date: Sat, 21 Jan 2006 06:28:14 -0800
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After upgrading to Xcode 2.2.1 from 2.1, I noticed something very odd:

/Developer/SDKs/MacOSX10.2.8.sdk/usr/include/gcc/darwin/3.3/c++/ cxxabi.h:276: warning: `virtual bool __cxxabiv1::__class_type_info::__do_upcast(const __cxxabiv1::__class_type_info*, void**) const' was hidden /Developer/SDKs/MacOSX10.2.8.sdk/usr/include/gcc/darwin/3.3/c++/ cxxabi.h:359: warning: by `virtual bool __cxxabiv1::__si_class_type_info::__do_upcast(const __cxxabiv1::__class_type_info*, const void*, __cxxabiv1::__class_type_info::__upcast_result&) const' /Developer/SDKs/MacOSX10.2.8.sdk/usr/include/gcc/darwin/3.3/c++/ cxxabi.h:276: warning: `virtual bool __cxxabiv1::__class_type_info::__do_upcast(const __cxxabiv1::__class_type_info*, void**) const' was hidden /Developer/SDKs/MacOSX10.2.8.sdk/usr/include/gcc/darwin/3.3/c++/ cxxabi.h:408: warning: by `virtual bool __cxxabiv1::__vmi_class_type_info::__do_upcast(const __cxxabiv1::__class_type_info*, const void*, __cxxabiv1::__class_type_info::__upcast_result&) const'

Looking at that cxxabi.h, it seems as though the warning is correct.

One odd thing is that when I just include cxxabi.h in a test file using g++-3.3 -isystem /Developer/SDKs/MacOSX10.2.8.sdk -Wall I don't get the warning. The real code is only using __cxa_demangle so there is no real difference between the real code and the test code that I can tell.

Any ideas on what might be going wrong or perhaps what changed in the 10.2.8 sdk?

- Steve

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