[PATCH] Dwarf: fix build with old gcc

[Alan Modra]

On Mon, Feb 15, 2021 at 12:07:20PM +0100, Jan Beulich via Binutils wrote:
> 4.3-ish warns about a possibly uninitialized variable, which results in
> a build failure due to -Werror.
> 
> binutils/
> 2021-02-15  Jan Beulich  <jbeulich@suse.com>
> 
> 	* dwarf.c (process_debug_info): Initialize "dwo_id".

OK.

> 
> --- a/binutils/dwarf.c
> +++ b/binutils/dwarf.c
> @@ -3693,7 +3693,7 @@ process_debug_info (struct dwarf_section
>  	SAFE_BYTE_GET_AND_INC (compunit.cu_pointer_size, hdrptr, 1, end);
>  
>        bfd_boolean do_dwo_id = FALSE;
> -      uint64_t dwo_id;
> +      uint64_t dwo_id = 0;
>        if (compunit.cu_unit_type == DW_UT_split_compile
>  	  || compunit.cu_unit_type == DW_UT_skeleton)
>  	{

-- 
Alan Modra
Australia Development Lab, IBM