llvm dev - Jun 2013 - [LLVMdev] gcc-4.8.1 -flto, error for visibility of LLVMX86CompilationCallback2?

I tried to compile LLVM with gcc-4.8.1 -flto. I got the following error, when
linking lli, llc, opt, or libLTO.so:

`LLVMX86CompilationCallback2' referenced in section `.text' of
/tmp/cclv7BYB.ltrans0.ltrans.o: defined in discarded section `.text' of
X86JITInfo.o (symbol from plugin)
collect2: error: ld returned 1 exit status

Removing the LLVM_LIBRARY_VISIBILITY attribute for LLVMX86CompilationCallback2
make the link pass for lli, llc, and opt, but not for libLTO.so.

Any ideas why this happens?

/Patrik Hägglund

On 10 June 2013 08:45, Patrik Hägglund H <patrik.h.hagglund at
ericsson.com> wrote:
> I tried to compile LLVM with gcc-4.8.1 -flto. I got the following error,
when linking lli, llc, opt, or libLTO.so:
>
> `LLVMX86CompilationCallback2' referenced in section `.text' of
/tmp/cclv7BYB.ltrans0.ltrans.o: defined in discarded section `.text' of
X86JITInfo.o (symbol from plugin)
> collect2: error: ld returned 1 exit status
>
> Removing the LLVM_LIBRARY_VISIBILITY attribute for
LLVMX86CompilationCallback2 make the link pass for lli, llc, and opt, but not
for libLTO.so.
>
> Any ideas why this happens?
I don't think gcc's LTO sees references from inline asm. Does adding
__attribute__((used)) work?
> /Patrik Hägglund
Cheers,
Rafael