[LLVMdev] Using clang+llvm from Xcode 3 project yields 1.5k linkage warnings

Chris Lattner
Tue, 01 Mar 2011 06:51:29 -0000

On Feb 28, 2011, at 8:07 PM, Félix Cloutier wrote:

> I'm using Xcode 3 to program with LLVM and Clang (both about
yesterday's latest revisions), and when I compile, I get 1501 link-time
warnings. All those I read were about symbol visibility. Here's an example:
>
> ld: warning: namespace::class::method() has different visibility (default)
in /usr/local/lib/libclangCodeGen.a(CodeGenAction.o) and (hidden) in
/Users/myself/Projets/path/build/project.build/Debug/project.build/Objects-normal/x86_64/object.o
>
> 1501 seems large enough that it could simply be all symbols referenced from
the static libraries. It works anyways though.
> What am I doing wrong? As usual with stuff causing spectacular diagnostics,
I must be missing something fairly elementary.

Hi Félix,

The most likely cause of this is that you're building some llvm code with
-fvisibility-inlines-hidden.  Xcode likes to add this flag by default, you can
change it in the target build options.

-Chris

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