On Mon, Mar 26, 2012 at 9:22 PM, Greg Clayton <[email protected]> wrote:
> Dmitry, > > Can you attach an example ELF file with DWARF and the main.cpp source file > to the bug so that I can take a look? "-pie" is not a valid argument for > our current darwin clang++, so this might be a linux specific compiler > driver option. > > Hi Greg, I've attached source and binary: http://llvm.org/bugs/show_bug.cgi?id=12355 On Mar 26, 2012, at 2:16 AM, Dmitry Vyukov wrote: > > > On Wed, Feb 29, 2012 at 12:50 PM, Dmitry Vyukov <[email protected]> > wrote: > > On Tue, Feb 28, 2012 at 10:25 PM, Greg Clayton <[email protected]> > wrote: > > > Ironically the symbolizer works great on gcc-compiled binaries, > > > but fails on clang-compiled binaries. > > > It provides some info but it's dead wrong (point into some > > > random STL source files). > > > objdump -dlS shows > > > correct info for the binaries, and I guess you mostly work with > > > clang-compiled binaries. > > > So are there any known problems? What may I be missing? > > > > Not that we know of. Clang binaries work great on MacOSX and symbolicate > just fine. If you have any quick examples where address lookups fail, > please send me examples off the list. > > > > > > I've tracked down the problem. > > When I build the lookup example as > > $ clang++ main.cpp -I../../include -llldb -g -frtti > > It works. > > However when I build it as: > > $ clang++ main.cpp -I../../include -llldb -g -frtti -fPIE -pie > > It fails to symbolize itself. While objdump -dSl symbolizes it (shows > line numbers inside of functions). If I build a program with gcc with -fPIE > -pie, it also able to symbolize itself (with lldb). > > So, the problem seems to be in tricky interaction of clang, lldb and > -pie. > > It's all Linux/amd64 and tip clang. > > > > > > Ping. Any progress on this? It's critical for us, we build everything > only with -pie, so this thing renders lldb useless for us. I've filed an > issue: > > http://llvm.org/bugs/show_bug.cgi?id=12355 > > > >
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