On 8/6/22 10:53, Sergei Trofimovich via Elfutils-devel wrote:
Hi.
Thanks for catching this. Btw. I've also noticed the elfutils failure
in openSUSE staging project.
> binutils started producing 0-sized DIEs on functions interspersed
> by nested sections (".section ...; .previous). This led to
> run-low_high_pc.sh failure in form of:
>
> FAIL: run-low_high_pc.sh
> ========================
>
> [b] main.c
> [2d] main
>
> [b] ../sysdeps/i386/start.S
> [26] _start
> [40] ../sysdeps/x86/abi-note.c
> [b52] init.c
> [b8e] static-reloc.c
> [2dba] _dl_relocate_static_pie
> [2dd8] ../sysdeps/i386/crti.S
> [2def] _init
> lowpc: 8049000, highpc: 8049000lx
> ../sysdeps/i386/crti.S: [2def] '_init' highpc <= lowpc
> FAIL run-low_high_pc.sh (exit status: 255)
>
> To work it around let's allow lowpc == highpc special case.
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=29450
>
> Signed-off-by: Sergei Trofimovich <sly...@gmail.com>
> ---
> tests/ChangeLog | 4 ++++
> tests/low_high_pc.c | 3 +++
> 2 files changed, 7 insertions(+)
>
> diff --git a/tests/ChangeLog b/tests/ChangeLog
> index 0c6f68ef..8296e0b6 100644
> --- a/tests/ChangeLog
> +++ b/tests/ChangeLog
> @@ -1,3 +1,7 @@
> +2022-08-04 Sergei Trofimovich <sly...@gmail.com>
> +
> + * low_high_pc.c (handle_die): Allow zero sized DIEs for binutils-2.39.
> +
> 2022-08-01 Mark Wielaard <m...@klomp.org>
>
> * run-debuginfod-percent-escape.sh: Add initial scan wait_ready.
> diff --git a/tests/low_high_pc.c b/tests/low_high_pc.c
> index cd022b1c..80c83b6d 100644
> --- a/tests/low_high_pc.c
> +++ b/tests/low_high_pc.c
> @@ -70,6 +70,9 @@ handle_die (Dwarf_Die *die, void *arg)
> if (dwarf_hasattr (die, DW_AT_low_pc)
> && dwarf_hasattr (die, DW_AT_high_pc)
> && highpc <= lowpc
> + /* gas-2.39 produces zero sized DIEs sometimes:
> + https://sourceware.org/PR29451. */
> + && highpc != lowpc
What about rather changing 'highpc <= lowpc' to 'highpc < lowpc'
and note that ...
> && ! (dwarf_tag (die) == DW_TAG_compile_unit && highpc == lowpc))
... here 'highpc == lowpc' would be always false and the entire condition:
'&& ! (dwarf_tag (die) == DW_TAG_compile_unit && highpc == lowpc))' always true.
Cheers,
Martin
> {
> printf("lowpc: %" PRIx64 ", highpc: %" PRIx64 "\n", lowpc, highpc);
