[cfe-dev] i386 -faddress-sanitizer

[Kostya Serebryany]

You are linking a shared object, asan.a should not be linked to it.
Are these all the flags passed to ld?


On Thu, Oct 18, 2012 at 6:23 PM, Carsten Mattner
<carstenmattner at gmail.com>wrote:

> On Thu, Oct 18, 2012 at 3:36 PM, Alexander Potapenko <glider at google.com>
> wrote:
> > Can you append -v at the place it's being invoked to check whether the
> > contents of LDFLAGS are being actually passed?
>
> $ clang <INPUT_OBJECTS> -lstdc++ -v -faddress-sanitizer -shared
> <PROJECT_FLAGS> -o <SO_FILE>
> clang
> version 3.2 (http://llvm.org/git/clang.git
> 278eafa2cd8296f8128d13c6466a0ace3d03a872)
> (http://llvm.org/git/llvm.git
> 2360b7ad99eedecaae512373e7be49c2143550cf)
> Target: i386-pc-linux-gnu
> Thread model: posix
>
> "/usr/bin/ld" --eh-frame-hdr -m elf_i386 -shared -o <SO_FILE>
> /usr/lib/gcc/i686-pc-linux-gnu/4.7.2/../../../crti.o
> /usr/lib/gcc/i686-pc-linux-gnu/4.7.2/crtbeginS.o
> -L/usr/lib/gcc/i686-pc-linux-gnu/4.7.2
> -L/usr/lib/gcc/i686-pc-linux-gnu/4.7.2/../../.. -L/lib -L/usr/lib
> <INPUT_OBJECTS> -lstdc++ -lgcc --as-needed -lgcc_s --no-as-needed -lc
> -lgcc --as-needed -lgcc_s --no-as-needed
> /usr/lib/gcc/i686-pc-linux-gnu/4.7.2/crtendS.o
> /usr/lib/gcc/i686-pc-linux-gnu/4.7.2/../../../crtn.o
>
> I guess the libasan archive should be part of the above call to ld.
>
> > On Thu, Oct 18, 2012 at 5:33 PM, Carsten Mattner
> > <carstenmattner at gmail.com> wrote:
> >> On Thu, Oct 18, 2012 at 3:29 PM, Alexander Potapenko wrote:
> >>> Are you linking with ld or clang?
> >>> -faddress-sanitizer is a Clang flag, so if you're running `ld $LDFLAGS
> >>> ...` to link your program, it won't work.
> >>
> >> clang.
> >>
> >>> On Thu, Oct 18, 2012 at 5:12 PM, Carsten Mattner
> >>> <carstenmattner at gmail.com> wrote:
> >>>> On Thu, Oct 18, 2012 at 12:27 AM, Eli Friedman wrote:
> >>>>> On Wed, Oct 17, 2012 at 1:43 PM, Carsten Mattner
> >>>>> <carstenmattner at gmail.com> wrote:
> >>>>>> Is it expected that -faddress-sanitizer  does not work on i386 and
> fails
> >>>>>> to properly link resulting in errors like 'undefined symbol:
> __asan_init'
> >>>>>> at runtime?
> >>>>>>
> >>>>>> I have ./lib/clang/3.2/lib/linux/libclang_rt.asan-i386.a in llvm's
> installation,
> >>>>>> but it doesn't look like it's linked automatically into the
> executable.
> >>>>>>
> >>>>>> CFLAGS:
> >>>>>> -faddress-sanitizer -O1 -fno-omit-frame-pointer -g $PROJECT_FLAGS
> >>>>>
> >>>>> You need to pass in -faddress-sanitizer both when compiling and when
> >>>>> linking an application.  Try something like
> >>>>> "LDFLAGS=-faddress-sanitizer".
> >>>>
> >>>> Oh that makes a lot of sense and is kind of obvious in hindsight.
> >>>> Yet it didn't work in a quick test. Any options I flags to pass for
> >>>> verbose printfs to see what's happening you can suggest?
> >>>> In the next test I'll also try to explicitly link the libasan archive
> >>>> manually for ruling out issues with that archive.
> >>>> _______________________________________________
> >>>> cfe-dev mailing list
> >>>> cfe-dev at cs.uiuc.edu
> >>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
> >>>
> >>>
> >>>
> >>> --
> >>> Alexander Potapenko
> >>> Software Engineer
> >>> Google Moscow
> >
> >
> >
> > --
> > Alexander Potapenko
> > Software Engineer
> > Google Moscow
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
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