Re: toolchain/46490: libexecinfo only wokrs on amd64

[christos%zoulas.com@localhost (Christos Zoulas)]

On May 28, 10:50am, martin%NetBSD.org@localhost (martin%NetBSD.org@localhost) 
wrote:
-- Subject: toolchain/46490: libexecinfo only wokrs on amd64

| The new libexecinfo seems to be implemented using a technique that is gcc
| specific and only works (with default compile flags) on amd64, where
| .eh_frame_hdr and .eh_frame sections are generated by default.n

I thought that using _Unwind_Foo should work on every arch.

| The corresponding test case seems to fail everywhere else right now.
| 
| The _Unwind_Backtrace() call calls back into "tracer" once, the t->n value
| is still (size_t)~0U so this frame is skipped, then unwinding terminates
| with reason 5 (end of stack) and zero frames are returned.
| 
| >How-To-Repeat:
| Run t_backtrace for example on sparc64.
| 
| >Fix:
| I am not sure this is fixable, may need some other technique.

Try USE_BUILTIN=yes in the Makefile.

christos