llvm dev - Feb 2017 - [lld] elf linker creates undefined empty symbol

Hi,

When running my own lld generated library/executable I'm getting:

LD_LIBRARY_PATH=. ./ConsoleApplication347
./ConsoleApplication347: symbol lookup error: ./ConsoleApplication347: 
undefined symbol:

(theres nothing after undefined symbol)

How can I figure out what's I'm doing wrong?

Full log:
https://gist.github.com/carlokok/1dd510a16e1922271b520f1c00b14656

readelf -s for ConsoleApplication347:
https://gist.github.com/carlokok/0950e4b33e0bf421852b3ac58fc18aea

readelf -s for ClassLibrary22.so:
https://gist.github.com/carlokok/109a03620abb95bdad6479426e3dce11


lld command line used:
lld -flavor gnu -O0 --lto-O0
--eh-frame-hdr --dynamic-linker "/lib64/ld-linux-x86-64.so.2"
"-L."
"-oConsoleApplication347"
"RemObjects.Elements.Cirrus.ConsoleApplication347.o"
"libgc.a" "Island.a" 
"RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-libc.so" 
"RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-ClassLibrary22"
"RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-libpthread.so"
"RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-librt.so" 
"RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-libgcc_s.so"


Input files:
https://www.dropbox.com/s/8yn3dggx05atn47/binLinux.zip?dl=0


output files:
https://www.dropbox.com/s/vxzl9jfkssmp3tk/testapp.zip?dl=0

-- 
Carlo Kok
RemObjects Software

Did you try to make a smaller test case? I'd try to remove unrelated code
from your project to minimize the code size so that it is easy to find a
cause.

On Tue, Feb 21, 2017 at 5:10 AM, Carlo Kok via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi,
>
> When running my own lld generated library/executable I'm getting:
>
> LD_LIBRARY_PATH=. ./ConsoleApplication347
> ./ConsoleApplication347: symbol lookup error: ./ConsoleApplication347:
> undefined symbol:
>
> (theres nothing after undefined symbol)
>
> How can I figure out what's I'm doing wrong?
>
> Full log:
> https://gist.github.com/carlokok/1dd510a16e1922271b520f1c00b14656
>
> readelf -s for ConsoleApplication347:
> https://gist.github.com/carlokok/0950e4b33e0bf421852b3ac58fc18aea
>
> readelf -s for ClassLibrary22.so:
> https://gist.github.com/carlokok/109a03620abb95bdad6479426e3dce11
>
>
> lld command line used:
> lld -flavor gnu -O0 --lto-O0
> --eh-frame-hdr --dynamic-linker "/lib64/ld-linux-x86-64.so.2"
> "-L."
> "-oConsoleApplication347"
> "RemObjects.Elements.Cirrus.ConsoleApplication347.o"
> "libgc.a" "Island.a"
"RemObjects.Elements.Cirrus.im
> portlib-ConsoleApplication347-libc.so"
"RemObjects.Elements.Cirrus.im
> portlib-ConsoleApplication347-ClassLibrary22" "
>
RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-libpthread.so"
>
"RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-librt.so"
"
>
RemObjects.Elements.Cirrus.importlib-ConsoleApplication347-libgcc_s.so"
>
>
> Input files:
> https://www.dropbox.com/s/8yn3dggx05atn47/binLinux.zip?dl=0
>
>
> output files:
> https://www.dropbox.com/s/vxzl9jfkssmp3tk/testapp.zip?dl=0
>
> --
> Carlo Kok
> RemObjects Software
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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> Input files:
> https://www.dropbox.com/s/8yn3dggx05atn47/binLinux.zip?dl=0
If you pass --reproduce foo.tar to lld it will create a foo.tar file
with all that is needed to reproduce the link.

Can you also share how you created the various .o files? If so I might
be able to try reducing the issue.

Cheers,
Rafael

On 2017-02-21 20:33, Rafael Avila de Espindola wrote:
>> Input files:
>> https://www.dropbox.com/s/8yn3dggx05atn47/binLinux.zip?dl=0
>
> If you pass --reproduce foo.tar to lld it will create a foo.tar file
> with all that is needed to reproduce the link.
>
> Can you also share how you created the various .o files? If so I might
> be able to try reducing the issue.
It's created by my own compiler.

https://www.dropbox.com/s/rmkyqks4lnr85rz/foo.tar?dl=0

My biggest problem is that I have no idea where I can start trying to 
narrow it down, on the so side, or on the executable side, the error is 
rather strange to begin with.


-- 
Carlo Kok
RemObjects Software