On Tue, Aug 3, 2010 at 1:44 AM, Steffen Sledz <[email protected]> wrote:
> Am 02.08.2010 18:32, schrieb Arun Sharma:
> >> AC_CHECK_LIB([unwind], [_Unwind_Backtrace], [], [ AC_MSG_ERROR([***
> Could not find libunwind ***]) ])
> >
> > _Unwind_Backtrace could be provided by other libraries as well. I'd
> > test for something specific to libunwind (eg: unw_step).
>
> This is not a good idea. unw_step is not a symbol from the library but only
> a define. So the check definitely fails.
>
The problem is: if you configure libunwind with -- enable_cxx_exceptions=no
(which is the default on x86, arm, mips), you'll not have these symbols
defined.
True - unw_step gets rewritten as _UL${plat}_step (see
tests/check-namespace.sh) - but why should it be a problem for writing an
autoconf macro as long as you're including the right header file with
#define unw_step ...?
-Arun
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