[LLVMdev] gold and debug information
jingl1345 at gmail.com
Tue Jul 20 11:18:55 PDT 2010
On Tue, Jul 20, 2010 at 12:39 PM, Devang Patel <devang.patel at gmail.com>wrote:
> On Tue, Jul 20, 2010 at 6:49 AM, Rafael Espindola <espindola at google.com>
> >> export PATH="$LLVMPREFIX/bin:$LLVMGCCPREFIX/bin:$PATH"
> >> export CC="llvm-gcc -use-gold-plugin -Wl,-plugin-opt=also-emit-llvm"
> >> export CXX="llvm-g++ -use-gold-plugin -Wl,-plugin-opt=also-emit-llvm"
> >> export RANLIB=/bin/true
> >> export CFLAGS="-O4 -g"
> >> then configure, make, and then hit the error.
> >> The error only happens if the CFLAGS has -g in it.
> > Can you reduce the testcase a bit? It would be a lot easier to
> > reproduce with the ld invocation and the .o files given to it.
> This (Unknown constant! in bitcode writer when -g is used) is a known
> bug in CloneModule, because it is not cloning MDNodes appropriately.
> So bug point is likely to run into this while reducing test case.
> I do not know whether gold is cloning module at -O4 or not.
> Is this bug fixed in mainline llvm?
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