Re: Linker shows "has different visibility" warning (2nd)
Re: Linker shows "has different visibility" warning (2nd)
- Subject: Re: Linker shows "has different visibility" warning (2nd)
- From: Mark Taylor <email@hidden>
- Date: Fri, 21 Mar 2008 11:08:24 -0400
For the benefit of anyone in the future who finds this thread in the
archives like I did, the resolution in my case was to make sure the
GCC "Inline Methods Hidden" flag (aka
"GCC_INLINES_ARE_PRIVATE_EXTERN") for my target matched the setting
for the library I was linking in. Changing that flag made the
thousands of warnings disappear. "Symbols Hidden by Default" aka
"GCC_SYMBOLS_PRIVATE_EXTERN" is also worth checking.
- Mark
On Jan 12, 2008, at 3:01 AM, Dieter Oberkofler wrote:
Thank you for all the replies.
I'm starting to understand but there is still one loose end: When
switching from XCode 2.4.1 on 10.4 to XCode 2.5 on 10.5 all build
scripts remained the same (the visibility flags in the different 3rd
party libraries and my own build scripts remained unchanged) but
before there where no warning and now I have several thousand
warning in a single link. The gcc version stayed the same, so where
does this come from?
Thank you,
Dieter
On 11.01.2008, at 18:44, Jerry wrote:
The solution seems to compile all the libraries you use with -
fvisibility=default or decorate all your source code with
visibility attributes, but this is no good if you're relying on
third-party libraries for which you don't have the source. I've
managed to get my warnings down to 10000 on every build, but build
time is doubled by the time it takes to print out all those
messages. My actual solution is to revert to Tiger for development,
which also solves a host of other linking problems, such as those
associated with using libcurl, and as a bonus I don't have kernel
panics every half hour any more.
Jerry
On 11 Jan 2008, at 16:40, Alexander von Below wrote:
Yes, it has been a topic on this list ... but a search of the
archives does not even yield my own posts about it :-/
So this should answer your questions:
http://developer.apple.com/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html
HTH
Alex
Am 11.01.2008 um 16:43 schrieb Dieter Oberkofler:
After upgrading from XCode 2.4.1 to 2.5 running on Leopard the
linker shows me thousands of "has different visibility" warnings.
(ld: warning __ZN13PWR_CStringRWC2ERKS_.eh has different
visibility (1) in /MyDev/LJS_DEV/app/trunk_build/debug/
libLJS_SQL_LIB.a(costcentre.o) and (2) in /MyDev/LJS_DEV/app/
trunk/xvt/mac/lib/libXVTPWRd.a(CTdiPackage.o))
Has someone already solved this one?
Thank you
Dieter
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