llvm dev - Feb 2010 - [LLVMdev] Problem in Adding a pass to LLVM

Hi,

I am trying to add alias analysis in llvm. I created a file 
ProfileAlias.cpp in llvm source at the place where Andersens.cpp is 
there. ProfileAlias.cpp does nothing at present just empty definitions 
of required functions.

When I build llvm I get the following error:

/home/ambika/llvm1/llvm-obj/Release/lib/libLLVMipa.a(ProfileAlias.o): In 
function `llvm::createProfileAliasPass()':
ProfileAlias.cpp:(.text+0x46): undefined reference to `vtable for 
ProfileAlias'
/home/ambika/llvm1/llvm-obj/Release/lib/libLLVMipa.a(ProfileAlias.o): In 
function `llvm::Pass* llvm::callDefaultCtor<ProfileAlias>()':
ProfileAlias.cpp:(.text._ZN4llvm15callDefaultCtorI12ProfileAliasEEPNS_4PassEv[llvm::Pass*
llvm::callDefaultCtor<ProfileAlias>()]+0x26): undefined reference to 
`vtable for ProfileAlias'
/usr/bin/ld: /home/ambika/llvm1/llvm-obj/Release/bin/opt: hidden symbol 
`vtable for ProfileAlias' isn't defined
/usr/bin/ld: final link failed: Nonrepresentable section on output



Can someone help me with this.

regards,
Ambika

Hi!

On 02.02.2010, at 20:16, ambika wrote:
> /home/ambika/llvm1/llvm-obj/Release/lib/ 
> libLLVMipa.a(ProfileAlias.o): In
> function `llvm::createProfileAliasPass()':
> ProfileAlias.cpp:(.text+0x46): undefined reference to `vtable for
> ProfileAlias'
http://gcc.gnu.org/faq.html#vtables

Does that help?

Andi

Well I have given empty bodies for all virtual functions but still I get 
the same error.
I referred to http://llvm.org/docs/AliasAnalysis.html#writingnew and 
followed the steps but still cannot build llvm.

regards,
Ambika

Andreas Neustifter wrote:
> Hi!
>
> On 02.02.2010, at 20:16, ambika wrote:
>
>> /home/ambika/llvm1/llvm-obj/Release/lib/libLLVMipa.a(ProfileAlias.o):
In
>> function `llvm::createProfileAliasPass()':
>> ProfileAlias.cpp:(.text+0x46): undefined reference to `vtable for
>> ProfileAlias'
>
> http://gcc.gnu.org/faq.html#vtables
>
> Does that help?
>
> Andi

Well I have given empty bodies for all virtual functions but still I get 
the same error.
I referred to http://llvm.org/docs/AliasAnalysis.html#writingnew and 
followed the steps but still cannot build llvm.

regards,
Ambika


Andreas Neustifter wrote:
> Hi!
>
> On 02.02.2010, at 20:16, ambika wrote:
>
>> /home/ambika/llvm1/llvm-obj/Release/lib/libLLVMipa.a(ProfileAlias.o):
In
>> function `llvm::createProfileAliasPass()':
>> ProfileAlias.cpp:(.text+0x46): undefined reference to `vtable for
>> ProfileAlias'
>
> http://gcc.gnu.org/faq.html#vtables
>
> Does that help?
>
> Andi