Errors while compiling libdw
When compiling the RTS in a validate build, I see
```
rts/Libdw.c: In function ‘set_initial_registers’:
rts/Libdw.c:316:12: error:
warning: ‘regs’ may be used uninitialized [-Wmaybe-uninitialized]
316 | return dwfl_thread_state_registers(thread, 0, 17, regs);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
316 | return dwfl_thread_state_registers(thread, 0, 17, regs);
| ^
In file included from rts/Libdw.c:15:0: error:
/nix/store/js14rv1j3yfqh0yc9x8p6r83xcs5x3vv-elfutils-0.187-dev/include/elfutils/libdwfl.h:745:6: error:
note: by argument 4 of type ‘const Dwarf_Word *’ {aka ‘const long unsigned int *’} to ‘dwfl_thread_state_registers’ declared here
745 | bool dwfl_thread_state_registers (Dwfl_Thread *thread, int firstreg,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
|
745 | bool dwfl_thread_state_registers (Dwfl_Thread *thread, int firstreg,
| ^
rts/Libdw.c:293:16: error:
note: ‘regs’ declared here
293 | Dwarf_Word regs[17];
| ^~~~
|
293 | Dwarf_Word regs[17];
| ^
rts/Libdw.c: At top level:
cc1: note: unrecognized command-line option ‘-Wno-nonportable-include-path’ may have been intended to silence earlier diagnostics
```
But the build seems to succeed anyway.
issue