llvm dev - Jun 2011 - [LLVMdev] Difficulties in using gold plugin. ("ar" not working properly)

Dear all,
I'm trying to use the gold plugin to make it easier to generate LLVM bitcode
from complex applications. I did the steps mentioned on
"http://llvm.org/docs/GoldPlugin.html". Both linking and LLVM
generation seem to
work properly, however when using the tool ar, the symbol table is lost.
"no
archive symbol table (run ranlib)".

I'm using LLVM 2.9, Ubuntu 10.10, binutils 2.20.51 both from the repository
and
hand built (with -enable-gold and -enable-plugins).

Both LLVMgold.so and libLTO.so are located in:
~/tools/libexec/gcc/x86_64-unknown-linux-gnu/4.2.1/
~/lib/bfd-plugins
/usr/lib/bfd-plugins

The following are the build commands:
llvm-g++ -use-gold-plugin -flto $test.cpp -c -o test.o
ar --plugin /usr/lib/bfd-plugins/LLVMgold.so crs test.a test.o
llvm-g++ -use-gold-plugin -Wl,-plugin-opt=also-emit-llvm test.a libstdc++.a -o

Maybe its just me doing some small error, but I can't see it..
Thanks for the help,
Istvan

On 11-06-15 09:03 AM, Istvan Haller wrote:
> Dear all,
> I'm trying to use the gold plugin to make it easier to generate LLVM
bitcode
> from complex applications. I did the steps mentioned on
> "http://llvm.org/docs/GoldPlugin.html". Both linking and LLVM
generation seem to
> work properly, however when using the tool ar, the symbol table is lost.
"no
> archive symbol table (run ranlib)".
>
> I'm using LLVM 2.9, Ubuntu 10.10, binutils 2.20.51 both from the
repository and
> hand built (with -enable-gold and -enable-plugins).
>
> Both LLVMgold.so and libLTO.so are located in:
> ~/tools/libexec/gcc/x86_64-unknown-linux-gnu/4.2.1/
> ~/lib/bfd-plugins
> /usr/lib/bfd-plugins
>
> The following are the build commands:
> llvm-g++ -use-gold-plugin -flto $test.cpp -c -o test.o
> ar --plugin /usr/lib/bfd-plugins/LLVMgold.so crs test.a test.o
> llvm-g++ -use-gold-plugin -Wl,-plugin-opt=also-emit-llvm test.a libstdc++.a
-o
>
> Maybe its just me doing some small error, but I can't see it..
Can you run nm on an IL file? What if you pass an explicit -plugin 
option to nm?
> Thanks for the help,
> Istvan
Cheers,
Rafael

Executing
nm --plugin /usr/lib/bfd-plugins/LLVMgold.so test.a
Gives:
00000000 W _ZN6tester4dumpEv
00000000 W _ZN6tester7readArgEPc
00000000 W _ZN6testerC1Ev
00000000 W _ZN6testerD1Ev
And and more entries 
Without the plugin command "File format not recognized".

So it seems like nm is using the plugin.

Istvan