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binutils, gdb: support zstd compressed debug sections

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PR29397 PR29563: Add new configure option --with-zstd which defaults to
auto.  If pkgconfig/libzstd.pc is found, define HAVE_ZSTD and support
zstd compressed debug sections for most tools.

* bfd: for addr2line, objdump --dwarf, gdb, etc
* gas: support --compress-debug-sections=zstd
* ld: support ELFCOMPRESS_ZSTD input and --compress-debug-sections=zstd
* objcopy: support ELFCOMPRESS_ZSTD input for
  --decompress-debug-sections and --compress-debug-sections=zstd
* gdb: support ELFCOMPRESS_ZSTD input.  The bfd change references zstd
  symbols, so gdb has to link against -lzstd in this patch.

If zstd is not supported, ELFCOMPRESS_ZSTD input triggers an error.  We
can avoid HAVE_ZSTD if binutils-gdb imports zstd/ like zlib/, but this
is too heavyweight, so don't do it for now.

```
% ld/ld-new a.o
ld/ld-new: a.o: section .debug_abbrev is compressed with zstd, but BFD is not built with zstd support
...

% ld/ld-new a.o --compress-debug-sections=zstd
ld/ld-new: --compress-debug-sections=zstd: ld is not built with zstd support

% binutils/objcopy --compress-debug-sections=zstd a.o b.o
binutils/objcopy: --compress-debug-sections=zstd: binutils is not built with zstd support

% binutils/objcopy b.o --decompress-debug-sections
binutils/objcopy: zstd.o: section .debug_abbrev is compressed with zstd, but BFD is not built with zstd support
...
```
This commit is contained in:
Fangrui Song
2022-09-26 19:50:13 -07:00
committed by Fangrui Song
parent e122316b7c
commit 2cac01e3ff
56 changed files with 1490 additions and 254 deletions
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8
ld/ldmain.c
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@@ -506,8 +506,12 @@ main (int argc, char **argv)
if ((link_info.compress_debug & COMPRESS_DEBUG))
{
link_info.output_bfd->flags |= BFD_COMPRESS;
if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
if (link_info.compress_debug != COMPRESS_DEBUG_GNU_ZLIB)
{
link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
if (link_info.compress_debug == COMPRESS_DEBUG_ZSTD)
link_info.output_bfd->flags |= BFD_COMPRESS_ZSTD;
}
}
ldwrite ();