Re: [Evolution] [RFH] Using the memory error detector AddressSanitizer (ASan)

[Reid Thompson <Reid Thompson ateb com>]

On Mon, 2015-05-11 at 12:43 +0000, Reid Thompson wrote:
> On Sat, 2015-05-09 at 16:08 +0200, Paul Menzel wrote:
> > Am Dienstag, den 05.05.2015, 13:11 +0000 schrieb Reid Thompson:
> > > On Tue, 2015-05-05 at 07:55 +0200, Paul Menzel wrote:
> > > > Am Samstag, den 02.05.2015, 11:58 +0000 schrieb Joakim Tjernlund:
> > > > > You need to set LDFLAGS too
> > > >
> > > > Unfortunately it still fails to build when passing
> > > > `LDFLAGS='-fsanitize=address'`.
> > >
> > > what is your complete build command and the error output
> >
> >         /bin/sh ../libtool  --tag=CC   --mode=link gcc ...
> >
> > Thanks,
> >
> > Paul
>
> from the brief looking that I did, building as you want requires the
> compilation to be done with clang -- correct???   not gcc ???
>
> reid

ok - i see both:
AddressSanitizer is a part of LLVM starting with version 3.1 and a part
of GCC starting with version 4.8 

and

In order to use AddressSanitizer you will need to compile and link your program using clang with the 
-fsanitize=address switch.

on https://code.google.com/p/address-sanitizer/wiki/AddressSanitizer

i have 
gcc version 4.8.4 (Gentoo 4.8.4 p1.4, pie-0.6.1) 

and  the below works for me.

% cat tests/use-after-free.c
#include <stdlib.h>
int main() {
  char *x = (char*)malloc(10 * sizeof(char*));
  free(x);
  return x[5];
}

gcc  -fsanitize=address -O1 -fno-omit-frame-pointer -g tests/use-after-free.c


this also works for me

clang -fsanitize=address -O1 -fno-omit-frame-pointer -g   tests/use-after-free.c


reid