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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/emultempl
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/emultempl')
-rw-r--r--ld/emultempl/elf.em9
1 files changed, 9 insertions, 0 deletions
diff --git a/ld/emultempl/elf.em b/ld/emultempl/elf.em
index c52484f..acd66f9 100644
--- a/ld/emultempl/elf.em
+++ b/ld/emultempl/elf.em
@@ -668,6 +668,15 @@ gld${EMULATION_NAME}_handle_option (int optc)
link_info.compress_debug = COMPRESS_DEBUG_GNU_ZLIB;
else if (strcasecmp (optarg, "zlib-gabi") == 0)
link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
+ else if (strcasecmp (optarg, "zstd") == 0)
+ {
+#ifdef HAVE_ZSTD
+ link_info.compress_debug = COMPRESS_DEBUG_ZSTD;
+#else
+ einfo (_ ("%F%P: --compress-debug-sections=zstd: ld is not built "
+ "with zstd support\n"));
+#endif
+ }
else
einfo (_("%F%P: invalid --compress-debug-sections option: \`%s'\n"),
optarg);