The wiki "Regeneration" page has this to say about update ULPs.
"The libm-test-ulps files are semiautomatically updated. To
update an ulps baseline, run each of the failing tests (test-float,
test-double, etc.) with -u; this will generate a file called ULPs;
concatenate each of those files with the existing libm-test-ulps
file, after removing any entries for particularly huge numbers of
ulps that you do not want to mark as expected. Then run
gen-libm-test.pl -n -u FILE where FILE is the concatenated file
produced in the previous step. This generates a file called
NewUlps which is the new sorted version of libm-test-ulps."
The same information is listed in math/README.libm-test, and is a
lot of manual work that you often want to run over-and-over again
while working on a particular test.
The `regen-ulps' convenience target does this automatically for
developers.
We strictly assume the source tree is readonly and add a
new --output-dir option to libm-test.inc to allow for writing
out ULPs to $(objpfx).
When run the new target does the following:
* Starts with the baseline ULPs file.
* Runs each of the libm math tests with -u.
* Adds new changes seen with -u to the baseline.
* Sorts and prepares the test output with gen-libm-test.pl.
* Leaves math/NewUlps in your build tree to copy to your source
tree, cleanup, and checkin.
The math test documentation in math/README.libm-test is updated
document the new Makefile target.
---
2013-04-06 Carlos O'Donell <carlos@redhat.com>
* Makefile.in (regen-ulps): New target.
* math/Makefile [ifneq (no,$(PERL)]: Declare regen-ulps with .PHONY.
[ifneq (no,$(PERL)] (run-regen-ulps): New variable.
[ifneq (no,$(PERL)] (regen-ulps): New target.
[ifeq (no,$(PERL)] (regen-ulps): New target.
* math/libm-test.inc (ulps_file_name): Define.
(output_dir): New variable.
(options): Add "output-dir" option.
(parse_opt): Handle 'o' case.
(main): If output_dir is non-NULL use it as a prefix
otherwise use "".
* math/README.libm-test: Update `How can I generate "libm-test-ulps"?'
2000-11-15 Ulrich Drepper <drepper@redhat.com>
* intl/Makefile: tst-gettext2.sh does not need a third parameter.
* intl/tst-gettext2.sh: Copy locale data. Adjust LOCPATH. Verify
output of program.
* intl/tst-gettext2.c: Set C locale if setting other locale
failed. Use gettext() not _().
* locale/setlocale.c: Increment _nl_msg_cat_cntr whenever we
successfully loaded a new locale.
2000-11-13 Andreas Jaeger <aj@suse.de>
* configure.in: Require gcc 2.95 or newer.
2000-11-15 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/paths.h: Adjust for FHS.
Patch by Arkadiusz Miskiewicz <misiek@pld.ORG.PL>.
2000-11-11 Jim Meyering <meyering@lucent.com>
* string/strndup.c (strndup): Cast return value to `char *'.
2000-11-15 Jim Meyering <meyering@ascend.com>
* sysdeps/generic/memchr.c: Remove some useless parentheses.
[HAVE_STDLIB_H || defined _LIBC]: Include <stdlib.h>.
[HAVE_BP_SYM_H || defined _LIBC]: Guard inclusion of bp-sym.h.
[! (HAVE_BP_SYM_H || defined _LIBC)] (BP_SYM): Define as no-op.
Also #undef __memchr.
Use `weak_alias' only if it's defined.
2000-11-10 H.J. Lu <hjl@gnu.org>
* Makefile.in (install): Set LANGUAGE=C LC_ALL=C.
1998-02-02 01:12 Ulrich Drepper <drepper@cygnus.com>
* libc.map: Add _h_errno.
* inet/herrno.c: Make _h_errno weak alias.
* login/Makefile (distribute): Add pty-internal.h.
* nscd/Makefile (distribute): Add all the files missing.
* signal/allocrtsig.c: Fix problem with recognizing whether RT sigs
are available.
* stdio-common/tstscanf.c: Rewrite a bit to continue after errors
and report status at the end.
* sysdeps/unix/sysv/linux/syscalls.list: Add lchown.
* sysdeps/unix/sysv/linux/i386/sysdep.S: Make errno an initialized
variable.
* sysdeps/unix/sysv/linux/powerpc/sysdep.c: Add alias _errno for errno.
* sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.S: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.S: Likewise.
1998-01-03 20:47 Mark Kettenis <kettenis@phys.uva.nl>
* configure.in: Fix --enable-add-ons code.
1998-02-01 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* elf/rtld.c (dl_main): Allow ":" as separator for LD_PRELOAD. Patch
by Rudolf Leitgeb <leitgeb@leland.stanford.edu>.
[PR libc/441]
* sysdeps/generic/dl-cache.c (_dl_load_cache_lookup): Use first
occurence in cache. Reported by Rudolf Leitgeb
<leitgeb@leland.stanford.edu>.
[PR libc/440]
1998-02-01 21:18 Ulrich Drepper <drepper@cygnus.com>
* libio/iovsscanf.c: Set errno to 0 before calling _IO_vfscanf so
that it never is EINTR (which is tested for in _IO_vfscanf).
* Makefile.in: Call sub-make with CVSOPTS.
* elf/Makefile (distribute): Add dl-procinfo.h.
* sysdeps/unix/sysv/linux/alpha/Dist: Add rt_sigaction.S.
1998-02-01 15:54 Ulrich Drepper <drepper@cygnus.com>
* version.h (VERSION): Bump to 2.0.92.
1998-01-31 Phil Blundell <philb@gnu.org>
* sysdeps/unix/sysv/linux/siglist.c (_sys_siglist): Additional weak
alias for __new_sys_siglist.
thread and not pthread_detach.
1997-02-02 00:39 Ulrich Drepper <drepper@cygnus.com>
* dirent/dirent.h: Add description _DIRENT_HAVE_D_TYPE.
1997-02-01 17:04 Philip Blundell <pjb27@cam.ac.uk>
* inet/netinet/ip.h (MAX_IPOPTLEN): Add definition.
1997-02-01 17:00 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/socketbits.h: Add definition of cmsghdr
structure plus related macros.
* sysdeps/unix/sysv/linux/cmsg_nxthdr.c: New file.
* sysdeps/unix/sysv/linux/Makefile [$(subdir)=socket]
(sysdep_routines): Add cmsg_nxthdr.
* sysdeps/unix/sysv/linux/Dist: Add cmsg_nxthdr.c.
Suggested by Philip Blundell <pjb27@cam.ac.uk>.
1997-02-01 12:34 Ulrich Drepper <drepper@cygnus.com>
* time/strftime.c: Define _strftime_copytm without protecting arguments
which breaks the definition.
1997-02-01 03:31 Thorsten Kukuk <kukuk@weber.uni-paderborn.de>
* nis/rpcsvc/yp_prot.h: Move definition of yppushresp_xfr after
definition of type for element.
1997-02-01 03:28 Philip Blundell <pjb27@cam.ac.uk>
* sydsdeps/unix/sysv/linux/netinet/in.h: Add IPv6 related IPPROTO_*
constants.
1997-02-01 03:09 H.J. Lu <hjl@lucon.org>
* Makefile: Pass PARALLELMFLAGS to sub-makes.
* Makefile.in: Mention PARALLELMFLAGS and pass to main Makefile.
1997-01-31 Paul Eggert <eggert@twinsun.com>
* time/mktime.c (HAVE_LIMITS_H, HAVE_LOCALTIME_R, STDC_HEADERS):
Define if _LIBC is defined.
<limits.h>: Include if HAVE_LIMITS_H instead of if
__STDC__ || __GNU_LIBRARY__ || STDC_HEADERS.
<stdlib.h>: Similarly, include if STDC_HEADERS.
(localtime_r): Redo #ifdef to make it clear that glibc has
localtime_r now.
1997-02-29 20:08 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sunrpc/Makefile ($(objpfx)rpcsvc/%.h, $(objpfx)x%.c): Use stamp
file to avoid unnecessary recompilation.
1997-01-29 19:33 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* Makefile: Set install-others, not install_others.
(before-compile): Use += to preserve previous value.
($(inst_includedir)/gnu/lib-names.h): Remove obsolete comment and
fix dependency name.
($(objpfx)lib-names.h): Remove rule.
* Makeconfig ($(common-objpfx)gnu/lib-names.h): Generate it here,
with correct name, using an intermediate stamp file.
(common-generated): Add gnu/lib-names.h.
(before-compile): Add $(common-objpfx)gnu/lib-names.h.
1997-01-30 18:29 Richard Henderson <richard@atheist.tamu.edu>
* malloc/malloc.c (MAGICBYTE): Use cast to size_t instead of unsigned
to prevent warnings on 64 bit systems.
Reported by Paul Wouters <paul@xtdnet.nl>.
* sysdeps/alpha/dl-machine.h: Revert check for broken gas. By default
we assume it works.
