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Symbols not found error when linking iPhone app in Xcode

Answer 1

+8 A:

C++filt is your friend it will unmangle those names to show you what is missing:

> c++filt __ZN9Scripting24create_squirrel_instanceEP4SQVMPNS_12AmbientSoundEb
Scripting::create_squirrel_instance(SQVM*, Scripting::AmbientSound*, bool)

The first line from above seems to indicate that it can't find the definition of the method create_squirrel_instace from the class Scripting.

So the order the libraries are presented to g++ (which is the compiler used on a mac) is important. So have a look at the build output and see if you can find the line where the libraries are linked:

It should look like this:

g++ <STUFF> -l<lib1> -l<lib2> etc.

I reformated the abovre output so it is readable: In the text I replace

/Users/Thomas/Documents/iPhone Dev Projects./SuperTux with <DIR> to help readability:

A whole bunch of the libraries are not being used becuase they are the wrong architecture:

ld warning: in <DIR>/SuperTux/libSDLiPhoneOS.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libphysfsdevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/liboggdevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libSDL_imagedevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libvorbisdevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libvorbisencdevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libvorbisfiledevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libminiswigdevice.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libSDL_mixer.a,
file is not of required architecture

ld warning: in <DIR>/SuperTux/libsquirreldevice.a,
file is not of required architecture

Then you also have some warning you should look at:

ld warning: __ZTVSt11range_error
has different visibility
(hidden) in <DIR>/SuperTux/libstdc++-static.a(stdexcept.o)
and (default) in <DIR>/SuperTux/build/SuperTux.build/Debug iphonesimulator/SuperTux.build/Objects-normal/i386/font.o

ld warning: __ZTISt11range_error
has different visibility
(hidden) in <DIR>/SuperTux/libstdc++-static.a(stdexcept.o)
and (default) in <DIR>/SuperTux/build/SuperTux.build/Debug iphonesimulator/SuperTux.build/Objects-normal/i386/font.o

ld warning: __ZTSSt11range_error
has different visibility
(hidden) in <DIR>/SuperTux/libstdc++-static.a(stdexcept.o)
and (default) in <DIR>/SuperTux/build/SuperTux.build/Debug iphonesimulator/SuperTux.build/Objects-normal/i386/font.o

ld warning: __ZTISt11range_error
has different visibility
(hidden) in <DIR>/SuperTux/libstdc++-static.a(functexcept.o)
and (default) in <DIR>/SuperTux/build/SuperTux.build/Debug iphonesimulator/SuperTux.build/Objects-normal/i386/font.o

ld warning: __ZTVSt11range_error
has different visibility
(hidden) in <DIR>/SuperTux/libstdc++-static.a(functexcept.o)
and (default) in <DIR>/SuperTux/build/SuperTux.build/Debug iphonesimulator/SuperTux.build/Objects-normal/i386/font.o

ld warning: __ZTSSt11range_error
has different visibility
(hidden) in <DIR>/SuperTux/libstdc++-static.a(functexcept.o)
and (default) in <DIR>/SuperTux/build/SuperTux.build/Debug iphonesimulator/SuperTux.build/Objects-normal/i386/font.o

Martin York 2009-10-04 21:31:26

i didn't know c++filt existed. that's excellent. it's unfortunate that link errors in Xcode don't already use it

Robert Karl 2009-10-04 21:43:57

The unused libraries make sense; I built all the libraries twice - once for the device and once for the simulator. The strange warnings disappear once I delete libstdc++-static.a. Must have accidentely linked it. Thanks for all the help, by the way. The errors are still there.

Firestar 2009-10-05 23:01:05

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Symbols not found error when linking iPhone app in Xcode

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