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authorFangrui Song <maskray@google.com>2022-09-26 19:50:13 -0700
committerFangrui Song <i@maskray.me>2022-09-26 19:50:13 -0700
commit2cac01e3ffff74898c54fa5e6418817f5578adb6 (patch)
treec0209ba03d922dae339056488493fc16ebefe6d0 /ld/ld.texi
parente122316b7ce78b999db944d7b524e11d642e2a49 (diff)
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binutils, gdb: support zstd compressed debug sections
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 ... ```
Diffstat (limited to 'ld/ld.texi')
-rw-r--r--ld/ld.texi5
1 files changed, 5 insertions, 0 deletions
diff --git a/ld/ld.texi b/ld/ld.texi
index eabbec8..9daed2e 100644
--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -2863,10 +2863,12 @@ but for most Linux based systems it will be @code{both}.
@kindex --compress-debug-sections=zlib
@kindex --compress-debug-sections=zlib-gnu
@kindex --compress-debug-sections=zlib-gabi
+@kindex --compress-debug-sections=zstd
@item --compress-debug-sections=none
@itemx --compress-debug-sections=zlib
@itemx --compress-debug-sections=zlib-gnu
@itemx --compress-debug-sections=zlib-gabi
+@itemx --compress-debug-sections=zstd
On ELF platforms, these options control how DWARF debug sections are
compressed using zlib.
@@ -2880,6 +2882,9 @@ sets the SHF_COMPRESSED flag in the sections' headers.
The @option{--compress-debug-sections=zlib} option is an alias for
@option{--compress-debug-sections=zlib-gabi}.
+@option{--compress-debug-sections=zstd} compresses DWARF debug sections using
+zstd.
+
Note that this option overrides any compression in input debug
sections, so if a binary is linked with @option{--compress-debug-sections=none}
for example, then any compressed debug sections in input files will be