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| author | Frank Ch. Eigler <fche@redhat.com> | 2024-09-19 17:06:48 -0400 |
|---|---|---|
| committer | Frank Ch. Eigler <fche@redhat.com> | 2024-09-24 09:59:42 -0400 |
| commit | 2299dfd4ba96c6852db862f6ec1b96880ecd6c0c (patch) | |
| tree | 2cec04c6b5e9a2416697851a0072857f0b0dd5bd /ld/lexsup.c | |
| parent | 07d74e51ba8691826b3bc758c2f7d2c1283e4d9b (diff) | |
| download | fsf-binutils-gdb-2299dfd4ba96c6852db862f6ec1b96880ecd6c0c.zip fsf-binutils-gdb-2299dfd4ba96c6852db862f6ec1b96880ecd6c0c.tar.gz fsf-binutils-gdb-2299dfd4ba96c6852db862f6ec1b96880ecd6c0c.tar.bz2 | |
ld: support --build-id=xx mode
The is patch adds a new ld build-id computation mode, "xx", using
xxhash in its 128-bit mode. The patch prereqs the xxhash-devel
headers being installed, and uses the "all-inlined" model, so no
run-time or link-time library dependence exists.
The xxhash mode performs well, saving roughly 20% of total userspace
run time from an ld job over a 800MB shared library relative to sha1.
128 bits of good hash should be collision-resistant to a number of
distinct binaries that numbers in the 2**32 - 2**64 range, even if not
"crypto" level hash. Confirmations of this are in progress.
ld/configury: add --with-xxhash mode, different from gdb case
because only using it in inline mode
ld/ldbuildid.c: add "xx" mode, #if WITH_XXHASH
ld/NEWS, ld.texi: mention new option
ld/lexsup.c: add enumeration of --build-id STYLES to --help
ld/testsuite/ld-elf/build-id.exp: add test case for 0xHEX case
and conditional for xx case;
also, simply tcl list syntax
https://inbox.sourceware.org/binutils/20240917201509.GB26396@redhat.com/
Signed-off-by: Frank Ch. Eigler <fche@redhat.com>
Diffstat (limited to 'ld/lexsup.c')
| -rw-r--r-- | ld/lexsup.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/ld/lexsup.c b/ld/lexsup.c index 4aa0124..8982073 100644 --- a/ld/lexsup.c +++ b/ld/lexsup.c @@ -2278,6 +2278,15 @@ elf_static_list_options (FILE *file) { fprintf (file, _("\ --build-id[=STYLE] Generate build ID note\n")); + /* DEFAULT_BUILD_ID_STYLE n/a here */ +#ifdef WITH_XXHASH + fprintf (file, _("\ + Styles: none,md5,sha1,xx,uuid,0xHEX\n")); + /* NB: testsuite/ld-elf/build-id.exp depends on this syntax */ +#else + fprintf (file, _("\ + Styles: none,md5,sha1,uuid,0xHEX\n")); +#endif fprintf (file, _("\ --package-metadata[=JSON] Generate package metadata note\n")); fprintf (file, _("\ |