gcc-4.8.1 -flto, error for visibility of LLVMX86CompilationCallback2?

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1

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

2

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