llvm dev - Mar 2011 - [LLVMdev] Using clang+llvm from Xcode 3 project yields 1.5k linkage warnings

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.
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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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Yes, that was it. Thank you very much.

Le 2011-03-01 à 01:51:29, Chris Lattner a écrit :
> 
> 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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