http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46686
--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-05-14
21:11:07 UTC ---
(In reply to comment #1)
> The generic code below relies on libgcc routines, it should work anywhere,
> doesn't it?
Well, on x86-64-linux, I needed at least the following modifications:
- #include "libgfortran.h"
- #include <stdint.h> /* For uintptr_t. */
- On Linux Dl_info does not work by default; as man dladdr states:
Glibc adds two functions not described by POSIX, with prototypes
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <dlfcn.h>
one could assume that _GNU_SOURCE had do be defined - but that does not work.
With #define __USE_GNU it works
- trace_function: The unused parameter gives a fatal warning - thus, I used
__attribute__((undefined)).
Then it compiles - but linking an executable fails with: "undefined reference
to `dladdr", unless I link with "-ldl". But then I get a backtrace of the form:
0x2af48a719fa7
0x2af48a7e2019
0x400698
0x400688
0x40067d
0x4006a1
0x4006d7
0x2af48b0dbbfd (__libc_start_main)
* * *
Regarding the functionality
* libgo/configure.ac has the check:
GCC_CHECK_UNWIND_GETIPINFO
Ditto for libada, libjava and libstdc++-v3.
Thus, we might pick some functionality from:
* libgo/runtime/go-unwind.c
* libjava/exception.cc
* libjava/stacktrace.cc
