2007-07-09 Roland McGrath <roland@redhat.com>
* emultempl/elf32.em (gld${EMULATION_NAME}_add_option): Add --build-id.
(gld${EMULATION_NAME}_handle_option): Handle --build-id.
(gld${EMULATION_NAME}_list_options): List --build-id.
(gld${EMULATION_NAME}_after_open): If --build-id was given,
synthesize a ".note.gnu.build-id" section and cache it in elf_tdata.
* ld.texinfo (Options): Describe --build-id.
* NEWS: Mention --build-id.
This commit is contained in:
Roland McGrath
parent
ff59fc360e
commit
c0065db732
3
ld/NEWS
3
ld/NEWS
@ -2,6 +2,9 @@
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* Linker sources now released under version 3 of the GNU General Public
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License.
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* ELF: New --build-id option to generate a unique per-binary identifier
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embedded in a note section.
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* Added support for National Semicondutor CompactRISC (ie CR16) target.
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* -l:foo now searches the library path for a filename called foo,
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@ -866,6 +866,45 @@ gld${EMULATION_NAME}_after_open (void)
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{
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struct bfd_link_needed_list *needed, *l;
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if (link_info.emit_note_gnu_build_id)
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{
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bfd *abfd;
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asection *s;
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bfd_size_type size;
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abfd = link_info.input_bfds;
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size = _bfd_id_note_section_size (abfd, &link_info);
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if (size == 0)
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{
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einfo ("%P: warning: unrecognized --build-id style ignored.\n");
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free (link_info.emit_note_gnu_build_id);
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link_info.emit_note_gnu_build_id = NULL;
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}
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else
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{
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s = bfd_make_section_with_flags (abfd, ".note.gnu.build-id",
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SEC_ALLOC | SEC_LOAD
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| SEC_IN_MEMORY | SEC_LINKER_CREATED
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| SEC_READONLY | SEC_DATA);
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if (s != NULL && bfd_set_section_alignment (abfd, s, 2))
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{
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struct elf_obj_tdata *t = elf_tdata (output_bfd);
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t->emit_note_gnu_build_id = link_info.emit_note_gnu_build_id;
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t->note_gnu_build_id_sec = s;
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elf_section_type (s) = SHT_NOTE;
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s->size = size;
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}
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else
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{
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einfo ("%P: warning: Cannot create .note.gnu.build-id section,"
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" --build-id ignored.\n");
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free (link_info.emit_note_gnu_build_id);
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link_info.emit_note_gnu_build_id = NULL;
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}
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}
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}
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if (link_info.eh_frame_hdr
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&& ! link_info.traditional_format
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&& ! link_info.relocatable)
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@ -1760,6 +1799,7 @@ cat >>e${EMULATION_NAME}.c <<EOF
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#define OPTION_EH_FRAME_HDR (OPTION_GROUP + 1)
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#define OPTION_EXCLUDE_LIBS (OPTION_EH_FRAME_HDR + 1)
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#define OPTION_HASH_STYLE (OPTION_EXCLUDE_LIBS + 1)
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#define OPTION_BUILD_ID (OPTION_HASH_STYLE + 1)
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static void
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gld${EMULATION_NAME}_add_options
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@ -1768,6 +1808,7 @@ gld${EMULATION_NAME}_add_options
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{
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static const char xtra_short[] = "${PARSE_AND_LIST_SHORTOPTS}z:";
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static const struct option xtra_long[] = {
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{"build-id", optional_argument, NULL, OPTION_BUILD_ID},
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EOF
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if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
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@ -1798,6 +1839,8 @@ cat >>e${EMULATION_NAME}.c <<EOF
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memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
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}
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#define DEFAULT_BUILD_ID_STYLE "md5"
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static bfd_boolean
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gld${EMULATION_NAME}_handle_option (int optc)
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{
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@ -1806,6 +1849,18 @@ gld${EMULATION_NAME}_handle_option (int optc)
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default:
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return FALSE;
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case OPTION_BUILD_ID:
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if (link_info.emit_note_gnu_build_id != NULL)
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{
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free (link_info.emit_note_gnu_build_id);
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link_info.emit_note_gnu_build_id = NULL;
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}
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if (optarg == NULL)
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optarg = DEFAULT_BUILD_ID_STYLE;
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if (strcmp (optarg, "none"))
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link_info.emit_note_gnu_build_id = xstrdup (optarg);
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break;
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EOF
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if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
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@ -1959,6 +2014,7 @@ cat >>e${EMULATION_NAME}.c <<EOF
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static void
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gld${EMULATION_NAME}_list_options (FILE * file)
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{
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fprintf (file, _(" --build-id[=STYLE]\tGenerate build ID note\n"));
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EOF
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if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
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@ -1966,6 +1966,28 @@ has been used.
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The @option{--reduce-memory-overheads} switch may be also be used to
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enable other tradeoffs in future versions of the linker.
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@kindex --build-id
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@kindex --build-id=@var{style}
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@item --build-id
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@itemx --build-id=@var{style}
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Request creation of @code{.note.gnu.build-id} ELF note section.
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The contents of the note are unique bits identifying this linked
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file. @var{style} can be @code{uuid} to use 128 random bits,
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@code{md5} to use a 128-bit @sc{MD5} hash on the normative parts
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of the output contents, or @code{0x@var{hexstring}} to use a
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chosen bit string specified as an even number of hexadecimal
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digits (@code{-} and @code{:} characters between digit pairs are
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ignored). If @var{style} is omitted, @code{md5} is used.
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The @code{md5} style produces an identifier that is always the
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same in an identical output file, but will be unique among all
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nonidentical output files. It is not intended to be compared as
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a checksum for the file's contents. A linked file may be
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changed later by other tools, but the build ID bit string
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identifying the original linked file does not change.
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Passing @code{none} for @var{style} disables the setting from any
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@code{--build-id} options earlier on the command line.
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@end table
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@c man end
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