On Mon, Aug 24, 2020 at 02:56:54PM +0200, Mark Wielaard wrote:
> DWARF5 makes it possible to read loclists tables without consulting
> the debuginfo tree by introducing a table header. Adding location views
> breaks this (at least for binutils and elfutils). So don't enable
> variable-location-views by default if DWARF5 or higher is selected.
This should be discussed with Alex, CCed.
I'd say elfutils/binutils should just show .debug_loclists independent of
.debug_info if there are no loc views and use .debug_info otherwise.
> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> index 70dc1ab73a12..e5dddc236d7d 100644
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -9301,9 +9301,9 @@ can be consumed by debug information consumers that are
> not aware of
> these augmentations, but they won't derive any benefit from them either.
>
> This is enabled by default when outputting DWARF 2 debug information at
> -the normal level, as long as there is assembler support,
> -@option{-fvar-tracking-assignments} is enabled and
> -@option{-gstrict-dwarf} is not. When assembler support is not
> +the normal level for DWARF versions lower than 5, as long as there
> +is assembler support, @option{-fvar-tracking-assignments} is enabled
> +and @option{-gstrict-dwarf} is not. When assembler support is not
> available, this may still be enabled, but it will force GCC to output
> internal line number tables, and if
> @option{-ginternal-reset-location-views} is not enabled, that will most
> diff --git a/gcc/toplev.c b/gcc/toplev.c
> index 07457d08c3aa..34218c6b3349 100644
> --- a/gcc/toplev.c
> +++ b/gcc/toplev.c
> @@ -1672,6 +1672,7 @@ process_options (void)
> && (write_symbols == DWARF2_DEBUG
> || write_symbols == VMS_AND_DWARF2_DEBUG)
> && !dwarf_strict
> + && dwarf_version < 5
> && dwarf2out_as_loc_support
> && dwarf2out_as_locview_support);
> }
> --
> 2.18.4
Jakub
