Right now, when using LTO, the intermediate object files do contain
debug info in sections starting with .gnu.debuglto_ prefix and are
not compressed when --compress-debug-sections is used.
It's a mistake and we can save quite some disk space. The following
example comes from tramp3d when the corresponding LTO sections
are compressed with zlib:
$ bloaty tramp3d-v4-v2.o -- tramp3d-v4.o
FILE SIZE VM SIZE
-------------- --------------
+83% +10 [ = ] 0 [Unmapped]
-68.0% -441 [ = ] 0 .gnu.debuglto_.debug_line
-52.3% -759 [ = ] 0 .gnu.debuglto_.debug_line_str
-62.4% -3.24Ki [ = ] 0 .gnu.debuglto_.debug_abbrev
-64.8% -1.12Mi [ = ] 0 .gnu.debuglto_.debug_info
-88.8% -4.58Mi [ = ] 0 .gnu.debuglto_.debug_str
-27.7% -5.70Mi [ = ] 0 TOTAL
bfd/ChangeLog:
* elf.c (_bfd_elf_make_section_from_shdr): Compress all debug
info sections.
gas/ChangeLog:
* write.c (compress_debug): Compress also ".gnu.debuglto_.debug_"
if the compression algorithm is different from zlib-gnu.
- /* Compress/decompress DWARF debug sections with names: .debug_* and
- .zdebug_*, after the section flags is set. */
+ /* Compress/decompress DWARF debug sections with names: .debug_*,
+ .zdebug_*, .gnu.debuglto_.debug_, after the section flags is set. */
if ((newsect->flags & SEC_DEBUGGING) != 0
&& (newsect->flags & SEC_HAS_CONTENTS) != 0
if ((newsect->flags & SEC_DEBUGGING) != 0
&& (newsect->flags & SEC_HAS_CONTENTS) != 0
- && ((name[1] == 'd' && name[6] == '_')
- || (name[1] == 'z' && name[7] == '_')))
+ && (newsect->flags & SEC_ELF_OCTETS) != 0)
{
enum { nothing, compress, decompress } action = nothing;
int compression_header_size;
{
enum { nothing, compress, decompress } action = nothing;
int compression_header_size;
return;
section_name = bfd_section_name (sec);
return;
section_name = bfd_section_name (sec);
- if (!startswith (section_name, ".debug_"))
+ if (!startswith (section_name, ".debug_")
+ && (!startswith (section_name, ".gnu.debuglto_.debug_")
+ || flag_compress_debug == COMPRESS_DEBUG_GNU_ZLIB))
return;
bool use_zstd = abfd->flags & BFD_COMPRESS_ZSTD;
return;
bool use_zstd = abfd->flags & BFD_COMPRESS_ZSTD;