path: root/open_issues/glibc.mdwn

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[[!tag open_issue_glibc]]

Here's what's to be done for maintaining glibc.

[[!toc levels=2]]


# [[General information|/glibc]]


# [[Sources|source_repositories/glibc]]


# [[Debian]] Cheat Sheet


# Configuration

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git log --reverse --pretty=fuller --stat=$COLUMNS,$COLUMNS -w -p -C --cc ..sourceware/master
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Last reviewed up to the [[Git mirror's 56e49b714ecd32c72c334802b00e3d62008d98e3
(2012-07-25) sources|source_repositories/glibc]].

  * `t/hurdsig-fixes`

        hurdsig.c: In function '_hurd_internal_post_signal':
        hurdsig.c:1188:26: warning: 'pending' may be used uninitialized in this function [-Wmaybe-uninitialized]
        hurdsig.c:1168:12: note: 'pending' was declared here

  * `t/host-independency`

    [[!message-id "87bougerfb.fsf@kepler.schwinge.homeip.net"]], [[!message-id
    "20120525202732.GA31088@intel.com"]], commit
    918b56067a444572f1c71b02f18255ae4540b043.  [[!GCC_PR 53183]], GCC commit
    c05436a7e361b8040ee899266e15bea817212c37.

  * `t/sysvshm`

        ../sysdeps/mach/hurd/shmat.c: In function '__shmat':
        ../sysdeps/mach/hurd/shmat.c:57:7: warning: implicit declaration of function '__close' [-Wimplicit-function-declaration]
        ../sysdeps/mach/hurd/shmget.c: In function 'get_exclusive':
        ../sysdeps/mach/hurd/shmget.c:85:8: warning: variable 'is_private' set but not used [-Wunused-but-set-variable]
        ../sysdeps/mach/hurd/shmget.c:102:8: warning: 'dir' may be used uninitialized in this function [-Wmaybe-uninitialized]
        ../sysdeps/mach/hurd/shmget.c:102:8: warning: 'file' may be used uninitialized in this function [-Wmaybe-uninitialized]

  * [[`t/tls`|t/tls]]

  * [[`t/tls-threadvar`|t/tls-threadvar]]

  * t/verify.h

    People didn't like this too much.

    Other examples:

      * 11988f8f9656042c3dfd9002ac85dff33173b9bd -- `static_assert`

  * [[toolchain/cross-gnu]], without `--disable-multi-arch`

        i686-pc-gnu-gcc ../sysdeps/i386/i686/multiarch/strcmp.S -c [...]
        ../sysdeps/i386/i686/multiarch/../strcmp.S: Assembler messages:
        ../sysdeps/i386/i686/multiarch/../strcmp.S:31: Error: symbol `strcmp' is already defined
        make[2]: *** [/media/boole-data/thomas/tmp/gnu-0/src/glibc.obj/string/strcmp.o] Error 1
        make[2]: Leaving directory `/media/boole-data/thomas/tmp/gnu-0/src/glibc/string'

    Might simply be a missing patch(es) from master.

  * --build=X

    `long double` test: due to `cross_compiling = maybe` wants to execute a
    file, which fails.  Thus `--build=X` has to be set.

  * Check what all these are:

        running configure fragment for sysdeps/mach/hurd
        checking Hurd header version... ok
        running configure fragment for sysdeps/mach
        checking for i586-pc-gnu-mig... i586-pc-gnu-mig
        checking for mach/mach_types.h... yes
        checking for mach/mach_types.defs... yes
        checking for task_t in mach/mach_types.h... task_t
        checking for thread_t in mach/mach_types.h... thread_t
        checking for creation_time in task_basic_info... yes
        checking for mach/mach.defs... yes
        checking for mach/mach4.defs... yes
        checking for mach/clock.defs... no
        checking for mach/clock_priv.defs... no
        checking for mach/host_priv.defs... no
        checking for mach/host_security.defs... no
        checking for mach/ledger.defs... no
        checking for mach/lock_set.defs... no
        checking for mach/processor.defs... no
        checking for mach/processor_set.defs... no
        checking for mach/task.defs... no
        checking for mach/thread_act.defs... no
        checking for mach/vm_map.defs... no
        checking for mach/memory_object.defs... yes
        checking for mach/memory_object_default.defs... yes
        checking for mach/default_pager.defs... yes
        checking for mach/i386/mach_i386.defs... yes
        checking for egrep... grep -E
        checking for host_page_size in mach_host.defs... no
        checking for mach/machine/ndr_def.h... no
        checking for machine/ndr_def.h... no
        checking for i386_io_perm_modify in mach_i386.defs... yes
        checking for i386_set_gdt in mach_i386.defs... yes
        checking whether i586-pc-gnu-mig supports the retcode keyword... yes

  * `sysdeps/i386/stackguard-macros.h`

    See [[t/tls|t/tls]].

  * Verify 77c84aeb81808c3109665949448dba59965c391e against
    `~/shared/glibc/make_TAGS.patch`.

  * `HP_SMALL_TIMING_AVAIL` not defined anywhere.

  * Unify `CPUCLOCK_WHICH` stuff in `clock_*` files.

  * Not all tests are re-run in a `make -k tests; make tests-clean; make -k
    tests` cycle.  For example, after `make tests-clean`:

        $ find ./ -name \*.out
        ./localedata/tst-locale.out
        ./localedata/sort-test.out
        ./localedata/de_DE.out
        ./localedata/en_US.out
        ./localedata/da_DK.out
        ./localedata/hr_HR.out
        ./localedata/sv_SE.out
        ./localedata/tr_TR.out
        ./localedata/fr_FR.out
        ./localedata/si_LK.out
        ./localedata/tst-mbswcs.out
        ./iconvdata/iconv-test.out
        ./iconvdata/tst-tables.out
        ./stdlib/isomac.out
        ./posix/wordexp-tst.out
        ./posix/annexc.out
        ./posix/tst-getconf.out
        ./elf/check-textrel.out
        ./elf/check-execstack.out
        ./elf/check-localplt.out
        ./c++-types-check.out
        ./check-local-headers.out
        ./begin-end-check.out

  * `CPUCLOCK_WHICH`, `t/cpuclock`

        /media/boole-data/thomas/tmp/gnu-0/src/glibc.obj/rt/librt_pic.a(clock_settime.os): In function `clock_settime':
        /media/boole-data/thomas/tmp/gnu-0/src/glibc/rt/../sysdeps/unix/clock_settime.c:113: undefined reference to `CPUCLOCK_WHICH'
        /media/boole-data/thomas/tmp/gnu-0/src/glibc/rt/../sysdeps/unix/clock_settime.c:114: undefined reference to `CPUCLOCK_WHICH'
        collect2: error: ld returned 1 exit status
        make[2]: *** [/media/boole-data/thomas/tmp/gnu-0/src/glibc.obj/rt/librt.so] Error 1
        make[2]: Leaving directory `/media/boole-data/thomas/tmp/gnu-0/src/glibc/rt'
        make[1]: *** [rt/others] Error 2
        make[1]: Leaving directory `/media/boole-data/thomas/tmp/gnu-0/src/glibc'
        make: *** [all] Error 2

  * Missing interfaces, amongst many more.

    Many more are missing, some of which have been announced in `NEWS`, others
    typically haven't (like new flags to existing functions).  Typically,
    porters will notice missing functionaly.  But in case you're looking for
    something to work on, here's a list.

    `AT_EMPTY_PATH`, `CLOCK_BOOTTIME`, `CLOCK_BOOTTIME_ALARM`,
    `CLOCK_REALTIME_ALARM`, `O_PATH`,
    `PTRACE_*` (for example, cbff0d9689c4d68578b6a4f0a17807232506ea27),
    `RLIMIT_RTTIME`, `SEEK_DATA` (`unistd.h`), `SEEK_HOLE` (`unistd.h`)
    `clock_adjtime`, `fallocate`, `fallocate64`, `name_to_handle_at`,
    `open_by_handle_at`, `process_vm_readv`, `process_vm_writev`, `sendmmsg`,
    `setns`, `sync_file_range`

      * `chflags`

        IRC, OFTC, #debian-hurd, 2012-04-27:

            <Steap> Does anyone have any idea why int main(void) { return
              chflags(); } will compile with gcc but not with g++ ? It says
              that "chflags" was not declared in this scope.
            <Steap> I get the same error on FreeBSD, but including sys/stat.h
              makes it work
            <Steap> Can't find a solution on Hurd though :/
            <youpi> the Hurd doesn't have chflags
            <youpi> apparently linux neither
            <youpi> what does it do?
            <Steap> change flags :)
            <Steap> Are you sure the Hurd does not have chflags ? Because gcc
              does not complain
            <youpi> there is no chflags function in /usr/include
            <youpi> but what flags does it change?
            <Steap> According to the FreeBSD manpage, it can set flags such as
              UF_NODUMP, UF_IMMUTABLE etc.
            <youpi> Hum, there is actually a chflags() definition
            <youpi> but no declaration
            <youpi> so actually chflags is supported, but the declaration was
              forgotten
            <youpi> probably because since linux doens't have it, it has never
              been a problem up to now
            <youpi> so I'd say ignore the error for now, we'll add the
              declaration

      * `getcontext`/`setcontext`

        Needed for [[gccgo]].

        IRC, freenode, #hurd, 2012-04-19:

            <gnu_srs> How much work/knowledge is needed to implement
              getcontext/setcontext?
            <gnu_srs> Any already implemented alternatives available?
            <youpi> x86 registers knowledge, as well as unix signal masks
            <youpi> there's the linux implementation that can be taken as an
              exxample, but the signal part has to be rewritten
            <gnu_srs> Well, it's a pity they are not implemented. That's the
              remaining hurdle to get gccgo working :-( 
            <youpi> uh :/
            <gnu_srs> Everything builds, but the testsuite fails due to these
              missing functions.
            <gnu_srs> Regarding getcontext/setcontext they seem to be written
              in assembly for linux but the code is not very long. 
            <gnu_srs> How much effort would it be to write something similar
              for Hurd? Anybody fluent in asm?
            <gnu_srs> And registers and signals.
            <tschwinge> gnu_srs: Signals is the key thing -- everything else we
              can probably just copy.  I have never/not yet looked at it,
              though.
            <gnu_srs> For kfreebsd it is written in C: kern_context.c, 3/4 in
              one file: getcontext, setcontext,  swapcontext, not makecontext.
            <gnu_srs> Dunno how much assembly calls used though.
            <gnu_srs> Hi, any preferences about implementing get/setcontext in
              C or Asm?
            <tschwinge> gnu_srs: I think these will have to be implemented in
              assembly.  Based on the Linux x86 variants.

        IRC, freenode, #hurd, 2012-04-20:

            <tschwinge> youpi: Your understanding of that is better than mine
              -- the *context stuff can't be very useful at the moment, because
              when the user changes uc_stack.ss_sp (which the glibc tests are
              doing), we're losing access to the _hurd_threadvars.  Correct?
            <tschwinge> At least the getcontext test works, the other get a
              SIGILL.
            <tschwinge> others
            <tschwinge> _hurd_threadvars issue is just guessing.
            <youpi> tschwinge: yes, threadvars are on the stack
            <youpi> threadvars is not much code, it should just work, but care
              has to be taken on the libpthread/libthread side, which does some
              initialization
            <tschwinge> OK, that at least matches my understanding.

      * [[`mremap`|mremap]]

      * `syncfs`

        We should be easily able to implement that one.

      * `futimesat`, `readlinkat`, `renameat`

        If we have all of 'em (check Linux kernel), `#define __ASSUME_ATFCTS`.

      * `bits/stat.h [__USE_ATFILE]`: `UTIME_NOW`, `UTIME_OMIT`

      * `io/fcntl.h [__USE_ATFILE]`

        Do we support `AT_FDCWD` et al.?
        (80b4e5f3ef231702b24d44c33e8dceb70abb3a06.)

      * `MAP_POPULATE` (`mmap`, `sys/mman.h`) -- *Populate (prefault)
        pagetables.*

        Some Linux kernel version, `mm/mmap.c`:

                if (vm_flags & VM_LOCKED) {
                        if (!mlock_vma_pages_range(vma, addr, addr + len))
                                mm->locked_vm += (len >> PAGE_SHIFT);
                } else if ((flags & MAP_POPULATE) && !(flags & MAP_NONBLOCK))
                        make_pages_present(addr, addr + len);
                return addr;

        Is only advisory, so can worked around with `#define MAP_POPULATE 0`,
        8069478040336a7de3461be275432493cc7e4c91.

      * `t/opendirat`: `opendirat` (`scandirat`, `scandirat64`)

        Need changes equivalent to c55fbd1ea768f9fdef34a01377702c0d72cbc213 +
        14d96785125abee5e9a49a1c3037f35a581750bd.

      * `madvise`, `MADV_DONTNEED`, `MADV_DONTDUMP`, `MADV_DODUMP`

        [[glibc_madvise_vs_static_linking]].

      * `msync`

        Then define `_POSIX_MAPPED_FILES`, `_POSIX_SYNCHRONIZED_IO`.

      * `sys/epoll.h`

        Used by [[wayland]], for example.

      * `sys/eventfd.h`

      * `sys/inotify.h`

      * `sys/signalfd.h`

      * `sys/timerfd.h`

      * `timespec_get` (74033a2507841cf077e31221de2481ff30b43d51)

      * `waitflags.h` (`WEXITED`, `WNOWAIT`, `WSTOPPED`, `WCONTINUED`)

        IRC, freenode, #hurd, 2012-04-20:

            <pinotree> in glibc, we use the generic waitflags.h which, unlike
              linux's version, does not define WEXITED, WNOWAIT, WSTOPPED,
              WCONTINUED
            <pinotree> should the generic bits/waitflags.h define them anyway,
              since they are posix?
            <youpi> well, we'd have to implement them anyway
            <youpi> but otherwise, I'd say yes
            <pinotree> sure, but since glibc headers should expose at least
              everything declared by posix, i thought they should be defined
              anyway
            <youpi> that might bring bugs
            <youpi> some applications might be #ifdefing them
            <youpi> and break when they are defined but not working
            <pinotree> i guess they would define them to 0, andd having them to
              non-zero values shouldn't break them (since those values don't do
              anything, so they would act as if they were 0.. or not?)
            <youpi> no, I mean they would do something else, not define them to
              0
            <pinotree> like posix/tst-waitid.c, you mean?
            <youpi> yes

    For specific packages:

      * [[octave]]

  * Create `t/cleanup_kernel-features.h`.

  * Add tests from Linux kernel commit messages for `t/dup3` et al.

  * In `sysdeps/unix/sysv/linux/Makefile`, there are a bunch of
    `-DHAVE_SENDFILE` -- but we do have `sendfile`, too.

  * `/usr/include/pthread.h` overwrite issue

    `make`, after editing `nss/nss_db/db-initgroups.c`:

        [...]
        make[2]: Leaving directory `/media/erich/home/thomas/tmp/glibc/tschwinge/Roger_Whittaker/resolv'
        make  subdir=nss -C nss ..=../ others
        make[2]: Entering directory `/media/erich/home/thomas/tmp/glibc/tschwinge/Roger_Whittaker/nss'
        /usr/bin/install -c -m 644 ../include/pthread.h /usr/include/pthread.h
        /usr/bin/install: cannot remove `/usr/include/pthread.h': Permission denied
        make[2]: *** [/usr/include/pthread.h] Error 1
        make[2]: Leaving directory `/media/erich/home/thomas/tmp/glibc/tschwinge/Roger_Whittaker/nss'
        make[1]: *** [nss/others] Error 2
        make[1]: Leaving directory `/media/erich/home/thomas/tmp/glibc/tschwinge/Roger_Whittaker'
        make: *** [all] Error 2

    See [[!message-id "871uv99c59.fsf@kepler.schwinge.homeip.net"]].  Passing
    `install_root=/INVALID` to `make`/`make check` is a cheap cure.  For `make
    install`, prepending an additional slash to `install_root` (that is,
    `install_root=//[...]`) is enough to obfuscate the Makefile rules.

  * `sysdeps/unix/sysv/linux/syslog.c`

  * Verify baseline changes, if we need any follow-up changes:

      * a11ec63713ea3903c482dc907a108be404191a02
      * 7e2b0c8562b35155820f87b5ff02a8b6850344cc
      * 8c0677fe5d91b7269364ca08fa08ed09e4c2d8c9
      * 5a2a1d75043138e696222ced4560de2fb90b8024
      * 5ae958d74180e2572d198bd7872c86f391de6da7
      * 5b08ac571ff8e94fe96511a532f0d20997de5f52
      * 3d04ff3a5d3ce3616837e1d15e03b6e1b360cf26
      * b2ef2c014b9c66995a3eb4f310ae7c5c510279bf
      * 63c4ed22b5048c8701d8806026c23cc95f0df756
      * ac2b484c02b01307ab6bbe5d45ddbf16d64edf8c
      * e35fcef8b739ed24e083ff8a3078ac14e101cf67
      * 6fb8cbcb58a29fff73eb2101b34caa19a7f88eba
      * 8a492a675e566dc1e666df0a86cbf541442cb179
      * 5dbc3b6cc0b759bf4b22d851ccb9cbf3e3cbc6ef
      * c86434ccb576a3ce35b5a74f72b9f03bd45b522a
      * d22e4cc9397ed41534c9422d0b0ffef8c77bfa53
      * 15bac72bac03faeb3b725b1d208c62160f0c3ad7
      * c08fb0d7bba4015078406b28d3906ccc5fda9d5a
      * 10b3bedcb03386cc280113f552479793e4bac35f
      * 754f7da38b0904b4b989d3500cc8dd5be625cf6a
      * 3cdaa6adb113a088fdfb87aa6d7747557eccc58d
      * 962dba7828cf251a9025ccb43bc6effa30379b72
      * 3162f12e58c3a848db883916843b332b9f8c9d39
      * 1c06ba3100847da6bd1f2e011dc24fa8debd9615
      * 84b9230c404aed4fd3a7bb3d045ca367043dde8c
      * 090555538d4347a52807ba9f08cf20ed13206afe
      * 817328eea788c746131cf151b64fd250200da333
      * c3758feebf7c8786231465da664743c6f0ec79cc
      * 1ac7a2c7b448c851eb8976fcc290a906a4075203
      * c21cc9bcb38a87ff638d1099ca871d94a2192b31
      * 6484ba5ef092b62b7d2112c0d976dbd6d1a40fde
      * b8b4863d78bf26b39918fc753b03ed98ef262903
      * b76b818e6fe2061e778b3a9bbe63c554c3f9b3c1
      * 8e9f92e9d5d7737afdacf79b76d98c4c42980508 -- `_dl_map_object` in
        `sysdeps/mach/hurd/dl-sysdep.c`
      * 0e516e0e14f2f9783a21cd1727bc53776341f857
      * a1fb5e3ebe9d38b5ae6c5bfbfaa04882d52355bc
      * cf7c9078a5acdbb435498ace92cd81009637a971
      * db753e2cfb2051ebf20dc089f87c5b1297cc2cff
      * 4a531bb0b3b582cb693de9f76d2d97d970f9a5d5 -- looks good.
      * 5bd6dc5c2c68fe98691db9b40f87d9b68ea9565b
      * 451f001b50870604e1f2daef12f04f9f460d3997 +
        a85b5cb4d4a5fc56e2b38638d270bf2daa67eb6c -- BZ10484.  `nptl/Versions
        [libc] (GLIBC_PRIVATE): Export __libc_alloca_cutoff`.  We don't even
        define it yet.  Also see
        [[glibc___libc_alloca_cutoff_should_be_lowered]].
      * 1086d70d916fd0eb969b3d89ff88abd35f6a5c34
      * cfa28e560ef69372b9e15e9a2d924a0fbcfc7bca
      * 8cf8ce1702c354a8266e3cfa6ab54c2467d1873f
      * 68dc949774cb651d53541df4abdc60327f7e096b
      * 70181fddf1467996bea393d13294ffe76b8a0853
      * a77e8cbc394ab098aa1fc3f0a6645a38348d21ca
      * 32465c3ea007065acd8ca8199f130cdf4068130d
      * 18ba70a559c52719fd94a713cc380514d9d19125
      * 620a05296fe3380b7441ba7720e8b25c48a8c28c
      * [low] e6c61494125126d2ba77e5d99f83887a2ed49783 -- `Fix memory leak in
        TLS of loaded objects.` Do we need to replicate `nptl/allocatestack.c`
        hunk?
      * 6e04cbbe79f5965809fdbf1f28d7ae8b4af74d31 +
        1bfbe0d335d3fc44a492648b974a0db19975f6d8 -- `Fix
        pathconf(_PC_BUF_SIZE).`
      * 28377d1bf58625172a1734b92e835591d4d23a18 -- `Optimize fdopendir a bit.`
      * 7fb90fb89bbdf273ab7ab96517fe1b156cd7aee1 +
        6fb2dde3f1aa3a1419cb6c2dfa53dd1d506722a4 -- `Fix Linux getcwd for long
        paths`
      * f574184a0e4b6ed69a5d9a3234543fba6d2a7367 -- `Fix sched_setscheduler
        call in spawn implementation`
      * 3b85df27870a47ed1db84e948e37a5a50a178a92 +
        f50ef8f1efdd1f2b040acbb8324604f168e8832a -- sysconf
      * 68a3f91fcad464c4737c1eaed4ae0bf539801fb2 -- `Fix reporting of invalid
        timeouts in emulated pselect`
      * ea389b12b3b65c4a7fa91fa76f8c99867eb37865 -- `strndup -> __strndup`;
        strndupa?
      * 7e4afad5bcf49e03c3b987399c6a8f66a9018660 -- `Nicer output for negative
        error numbers in strerror_r`.  Change needed for
        `sysdeps/mach/_strerror.c`?
      * 7ea72f99966a65a56aedba817ee2413ff9b1f23c +
        adcd5c15d2a37794d021104160b425ff61f88219 -- `Always fill output buffer
        in XPG strerror function`.  Change needed for
        `sysdeps/mach/xpg-strerror.c`?
      * a91710475294c66d0005bdaae0919d36ef8ce3d2 -- sotruss.  Does it work?
      * b1ebd700c5295a449f8d114740f0d1fb6e6b2eb5 +
        80e2212d8e59933a1641f029ebd360526ff0e074 +
        4997db742946d08be4378cf91221f558f928bc73 -- `Don't document si_code
        used for raise()`.  Also for `bits/siginfo.h`?
      * 11988f8f9656042c3dfd9002ac85dff33173b9bd -- pldd, Does it work?
        Probably not: needs `/proc/[PID]/auxv`, `/proc/[PID]/exe`,
        `/proc/[PID]/mem` ([[!tag open_issue_hurd]],
        [[hurd/translator/procfs]]).
      * 9113ea1f3f29b3aee710efc829e85a9772bcb836 -- `--experimental-malloc`.
        Watch what happens.
      * 4e34ac6a1e256f40ab0d8eeed37aa1ea83440e76 -- `-defsym=_begin=0`.  Watch
        what happens.  Native build: apparently OK.
      * f781ef4015504e8a1da649c266584976238aa079 (`--with-default-link`) +
        1b74661a6b93a892ecb1c717dedeedba5c2a976c +
        fd5e21c75d8e9221d766f4bc922a237265514ec2.  Watch what happens.  Native
        build: `use-default-link = no`.
      * de283087c74f720cf8a7171972e72b5fa2b45e79 (`Handle Lustre filesystem`),
        4e5f31c847982997c856f03bbc35134e9fd0f61f (`Handle ext4 in
        {,f}pathconf`).  What about stuff like that for us?
      * d30cf5bb00bfb286ff14d931fb69f5b53724bcdc (`Find readelf with
        AC_CHECK_TOOL`).  Aren't there more in other configure.in and Makefile
        files?
      * 7a03a9c8c4b37b88ac5e82b557d974f3161ddaf9 (`Add read barriers in
        cancellation initialization`).  Is this needed in other places, too?
      * [low] 5744c68d78f6ca6c6500e2c8d3d85b3a31f4ed2a (`Align x86 TCB to 64
        bytes`).  Probably we have hidden somewhere such a constant, too (in
        libpthread).
      * d96de9634a334af16c0ac711074c15ac1762b23c +
        ecb1482ffd85fd3279642b1dc045aa867ad4d415 (`Try shell in posix_spawn*
        only in compat mode`).  Change looks good, but what about
        `SPAWN_XFLAGS_TRY_SHELL` for us?
      * 3ce1f2959437e952b9db4eaeed2407424f11a4d1 (`Make several tool features
        mandatory and simplify the code.`).  Generally looks good.
          * `locale/global-locale.c`: Apparently, no one is using
            `_HURD_THREADVAR_LOCALE`.  But it is exported via
            `hurd/threadvar.h`.
          * `mach/devstream.c`: reversed.  Fixed in
            `t/repair-mach_devstream.c`.
          * `malloc/arena.c`: should be OK.
      * `Remove support for !USE___THREAD`.
        d063d164335938d557460bebaa7cfe388157b627 (generally looks good;
        `csu/errno-loc.c` (should be OK); `include/errno.h` (fixed)) +
        (de82006d43e198fd162807c9adc720c7ebd728a3 +
        037e9fe21c92216ef7032ea2796781ec27ca182a) +
        995a80dfbcb443ead5aa22682c884ec5c827a2ea (discussing) +
        bc7e1c3667b577ad418f7520df2a7dbccea04ee9 (should be ok).
      * [OK] 22a89187139a9083ca73989bfd11597e0f85cb61 (`malloc: Remove all
        kinds of unused configuration options and dead code.`).  `NO_STARTER`
        changes (should be OK).
      * [high] `pagesize`, 02d46fc4b969e25e4ba0c54aa95fa98d7279bd05 (`Simplify
        malloc initialization`); aebae0537dcb408100b88c6b7647a7e858c43237, `BZ
        11929`.  Is this all kosher for us?  See [[!message-id
        "87mxd9hl2n.fsf@kepler.schwinge.homeip.net"]].
      * [OK] 83cd14204559abbb52635006832eaf4d2f42514a (`Remove --wth-tls
        option, TLS support is required`).
      * a7c8e6a1478de9f990b11e5e853318ccbe4330f2 (`Fix invalid conversion in
        __cmsg_nxthdr`).  Probably just a C++ thing and not relevant for us;
        see [[!message-id "87r52nk1kx.fsf@kepler.schwinge.homeip.net"]].
      * [low] `mmap`, 110946e473b38fc3896212e416d9d7064fecd5b7.  Kosher with
        respect to our [[glibc/mmap]] peculiarities?
      * [OK] `__attribute__ ((__leaf__))`, `BZ #13344`,
        aa78043a4aafe5db1a1a76d544a833b63b4c5f5c +
        49a43d80ec5c97cf6136b1ee2687414773b2d5aa +
        3871f58f065dac3917eb18220a479e9591769c8c +
        9beb2334930db81ceada5aa6051fe5ac0554db32 +
        0ffc4f3ebaace42cd545db55a2ac50b6e0cc7d89 +
        edc5984d4d18296d7aa3d8f4ed8f7336a743170e +
        57769839788e2c62b68d9dfbf4b35052321278ba.
        <http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html>.
      * [low] `conformtest`, 3134156779108fe8b46e0f4cd60d837572faaa93 +
        4efeffc1d583597e4f52985b9747269e47b754e2 +
        d94a4670800de6e8f088b8630ad5142866127980 -- should probably mirror
        `bits/siginfo.h` changes.
      * [low] stack guard, 6c6a98c983c44b440ae66d2aa8f32529a9dd7bfe,
        [[!message-id "4F3BE241.9090409@mentor.com"]] -- anything needed for
        us?
      * [low] `libc-lockP.h` 9463518d0d314d7bd0160315e0ef30e15be08985 --
        probably should do similar changes, also to the generic file.
      * [low] `bits/socket.h`/`bits/socket_type.h` [[!message-id
        "Pine.LNX.4.64.1203090206420.18868@digraph.polyomino.org.uk"]]
        02a6f887cb3e2c048937111eb4cf150d397609de -- probably should do the same
        for the generic version as used by GNU Hurd.
      * [low] CFI for `_start`, 6a1bd2a100c958d30bbfe8c9b8f9071d24b7c3f4,
        [[!message-id "20120316180551.GA6291@host2.jankratochvil.net"]] -- what
        about other architectures?
      * `sendmmsg` usage, c030f70c8796c7743c3aa97d6beff3bd5b8dcd5d -- need a
        `ENOSYS` stub, [[!message-id "87a9zubdm9.fsf@schwinge.name"]],
        `t/sendmmsg`.
      * `linkobj/libc.so`, 510bbf14b4f25fec8ee3a2d24de3f24bdbf84333 -- need to
        adapt for (conditional?) Sun RPC reversion (if that was the original
        cause for the patch)?
      * [low] `Add __fsword_t and use it in bits/statfs.h`,
        3e5aef87d76cfa7354f2b0d82b96e59280720796, [[!message-id
        "20120517134700.GA19046@intel.com"]] -- only updates one copy of
        `bits/statfs.h`; update the others, too, for consistency.
      * *baseline*


# Build

Here's a log of a glibc build run; this is from our [[Git repository's
8958805c11c741d9211e20612c86271d906c9a0b (2012-07-28; 2012-06-30)
sources|source_repositories/glibc]], run on coulomb.SCHWINGE.

    $ export LC_ALL=C
    $ ../Roger_Whittaker/configure AUTOCONF=: --prefix=/usr --disable-profile --disable-multi-arch --build=i486-gnu --host=i486-gnu CC=gcc-4.6 CXX=g++-4.6 2>&1 | tee log_build
    [...]
    $ make install_root=/INVALID 2>&1 | tee log_build_
    [...]

This takes up around 500 MiB and needs roughly X min on kepler.SCHWINGE and 100
min on coulomb.SCHWINGE.

<!--

    $ (make install_root=/INVALID && touch .go-install) 2>&1 | tee log_build_ && test -f .go-install && (make install_root="$PWD".install install && touch .go-check) 2>&1 | tee log_install && test -f .go-check && ln -s /usr/lib/i386-*gnu/libstdc++.so.6 /lib/i386-*gnu/libpthread-stubs.so.0 /lib/i386-*gnu/libgcc_s.so.1 mach/libmachuser.so.1 hurd/libhurduser.so.0.3 ./ && make -k install_root=/INVALID check fast-check=yes 2>&1 | tee log_test

Mask out gcc-4.X (with possibly a backslash before the dot), GCC 4.5's column
output for (warning, error) messages, GCC 4.6's `[-Wsomething]` or `[enabled by
default]` identifiers which warning flag triggered.

    $ for f in log_*; do sed -e 's%gcc-4\\\?.[456]%[GCC]%g' -e 's%g++-4\\\?.[456]%[G++]%g' -e 's%\(:[0-9]\+:\)[0-9]\+:%\1%' -e 's% \[\(-W[a-z-]\+\|enabled by default\)\]$%%' < "$f" > "$f".nv; done

    $ find ./ -name \*.o -o -name \*.os -o -name \*.oS | while read f; do ~/tmp/gcc/git/contrib/compare-debug --preserve ../Roger_Whittaker.build-gcc-4.4-486.O/"$f" "$f"; done 2>&1 | less 
    $ while read f; do (readelf -a "$f" && objdump -xDrtw "$f") > N && (cd ../Roger_Whittaker.build-gcc-4.4-486.O/ && readelf -a "$f" && objdump -xDrtw "$f") > O && diff -u O N | less; done
    $ find ./ -name \*.o -o -name \*.os -o -name \*.oS | while read f; do readelf -h "$f" | grep OS/ABI | (read a b && [ x"$b" != x'UNIX - System V' ] && echo "### $f: $b"); done

-->


## Analysis

    $ toolchain/logs/process gcc build fetch coulomb.SCHWINGE

TODO.

  * With GCC 4.5, there's a ton of these warnings:

        hurd/hurd.h: In function '__hurd_fail':
        hurd/hurd.h:73: warning: case value '0' not in enumerated type 'error_t'

    ... as well as a few individual instances:

        hurdselect.c: In function '_hurd_select':
        hurdselect.c:265: warning: case value '0' not in enumerated type 'error_t'
        get-host.c: In function '_hurd_get_host_config':
        get-host.c:38: warning: case value '0' not in enumerated type 'error_t'
        hurdmsg.c: In function '_S_msg_get_init_ints':
        hurdmsg.c:186: warning: case value '0' not in enumerated type 'error_t'
        hurdmsg.c: In function '_S_msg_set_init_ints':
        hurdmsg.c:273: warning: case value '0' not in enumerated type 'error_t'
        intr-msg.c: In function '_hurd_intr_rpc_mach_msg':
        intr-msg.c:363: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/setitimer.c: In function 'timer_thread':
        sysdeps/mach/hurd/setitimer.c:117: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/wait4.c: In function '__wait4':
        sysdeps/mach/hurd/wait4.c:40: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/fork.c: In function '__fork':
        sysdeps/mach/hurd/fork.c:423: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/spawni.c: In function '__spawni':
        sysdeps/mach/hurd/spawni.c:600: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/setpriority.c: In function 'setonepriority':
        sysdeps/mach/hurd/setpriority.c:66: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/ioctl.c: In function 'send_rpc':
        sysdeps/mach/hurd/ioctl.c:177: warning: case value '0' not in enumerated type 'error_t'
        sysdeps/mach/hurd/ioctl.c: In function '__ioctl':
        sysdeps/mach/hurd/ioctl.c:306: warning: case value '0' not in enumerated type 'error_t'

    [[!message-id "20120723195143.7F8142C0B9@topped-with-meat.com"]].

  * baseline
    fd5bdc0924e0cfd1688b632068c1b26f3b0c88da..2ba92745c36eb3c3f3af0ce1b0aebd255c63a13b
    introduces:

        genops.c: In function '_IO_flush_all_lockp':
        genops.c:869:3: warning: passing argument 1 of '__save_FCT' makes pointer from integer without a cast [enabled by default]
        genops.c:869:3: note: expected 'void *' but argument is of type 'int'

    A similar warning has already been (and still is) seen here:

        dl-iteratephdr.c:83:3: warning: passing argument 1 of '__save_FCT' makes pointer from integer without a cast [enabled by default]
        dl-iteratephdr.c:83:3: note: expected 'void *' but argument is of type 'int'

  * baseline
    fd5bdc0924e0cfd1688b632068c1b26f3b0c88da..2ba92745c36eb3c3f3af0ce1b0aebd255c63a13b
    (or probably Samuel's mmap backport) introduces:

        ../sysdeps/mach/hurd/mmap.c: In function '__mmap':
        ../sysdeps/mach/hurd/mmap.c:54:15: warning: comparison between pointer and integer [enabled by default]
        ../sysdeps/mach/hurd/mmap.c:66:21: warning: comparison between pointer and integer [enabled by default]
        ../sysdeps/mach/hurd/mmap.c:143:13: warning: comparison between pointer and integer [enabled by default]
        ../sysdeps/mach/hurd/mmap.c:165:24: warning: comparison between pointer and integer [enabled by default]

  * baseline
    fd5bdc0924e0cfd1688b632068c1b26f3b0c88da..2ba92745c36eb3c3f3af0ce1b0aebd255c63a13b
    introduces:

        nscd_gethst_r.c: In function '__nscd_get_nl_timestamp':
        nscd_gethst_r.c:112:4: warning: implicit declaration of function 'time' [-Wimplicit-function-declaration]

    This was already present before:

        nscd_gethst_r.c: In function 'nscd_gethst_r':
        nscd_gethst_r.c:426:5: warning: implicit declaration of function '__close' [-Wimplicit-function-declaration]

  * baseline
    2ba92745c36eb3c3f3af0ce1b0aebd255c63a13b..7a270350a9bc3110cd5ba12bbd8c5c8c365e0032
    introduces:

        In file included from regex.c:62:0:
        regcomp.c: In function 'init_word_char':
        regcomp.c:935:4: warning: large integer implicitly truncated to unsigned type [-Woverflow]
        regcomp.c:936:4: warning: large integer implicitly truncated to unsigned type [-Woverflow]

        tst-relsort1.c:6:1: warning: function declaration isn't a prototype [-Wstrict-prototypes]


# Install

TODO.

    $ make install_root="$PWD".install install 2>&1 | tee log_install
    [...]

This takes up around 100 MiB, and needs roughly X min on kepler.SCHWINGE and 16
min on coulomb.SCHWINGE.


## Analysis

    $ toolchain/logs/process gcc install fetch coulomb.SCHWINGE

TODO.

<!--
    $ diff -wu <(ssh kepler.SCHWINGE 'cd tmp/source/gdb/ && cat hurd/master.build/log_install | sed -e "s%\(/media/data\)\?${PWD}%[...]%g"' | sed -f open_issues/gdb/log_install-linux.sed) <(ssh coulomb.SCHWINGE 'cd tmp/gdb/ && cat hurd/master.build/log_install | sed "s%\(/media/erich\)\?${PWD}%[...]%g"' | sed -f open_issues/gdb/log_install-hurd.sed) > open_issues/gdb/log_install.diff

[[log_install.diff]].

  * `libtool: finish`: `ldconfig` is not run for the Hurd.

-->


# Testsuite

    $ make -k install_root=/INVALID check fast-check=yes 2>&1 | tee log_test
    [...]

This needs roughly X min on kepler.SCHWINGE and 60 min on coulomb.SCHWINGE.

Specifying `fast-check=yes` disables the `conformtest` which takes 1.75 h (out
of 2.75 h total) on coulomb.SCHWINGE, doesn't pass anyway, and clearly isn't
our most critical issue to solve.

<!--
    $ ssh kepler.SCHWINGE 'cd tmp/source/gdb/ && sed < hurd/master.build/gdb/testsuite/gdb.sum -e "s%\(/media/data\)\?${PWD}%[...]%g"' > open_issues/gdb/sum_linux
    $ ssh coulomb.SCHWINGE 'cd tmp/gdb/ && sed < hurd/master.build/gdb/testsuite/gdb.sum -e "s%\(/media/erich\)\?${PWD}%[...]%g"' > open_issues/gdb/sum_hurd

Comparing the results files, [[sum_linux]] to [[sum_hurd]]:

    $ diff -u -F ^Running open_issues/gdb/sum_linux open_issues/gdb/sum_hurd > open_issues/gdb/sum.diff

[[open_issues/gdb/sum.diff]].
-->


## Analysis

    $ toolchain/logs/process gcc test fetch coulomb.SCHWINGE

There is quite a baseline of failures.


### Additional Failures Compared to Debian

    $ bash ~/tmp/glibc/debian/eglibc-2.13/debian/testsuite-checking/convertlog.sh log_test  > log_test.filtered
    $ bash ~/tmp/glibc/debian/eglibc-2.13/debian/testsuite-checking/compare.sh ~/tmp/glibc/debian/eglibc-2.13/debian/testsuite-checking/expected-results-i486-gnu-libc log_test.filtered

  * `bug-atexit3.out`, `debug/tst-chk4`, `debug/tst-chk5`, `debug/tst-chk6`,
    `debug/tst-lfschk4`, `debug/tst-lfschk5`, `debug/tst-lfschk6`

        dlopen failed: libstdc++.so.6: cannot open shared object file: No such file or directory

    See [[!message-id "20090420002344.11798.qmail@s461.sureserver.com"]].
    Hacked around with `ln -s /usr/lib/i386-*gnu/libstdc++.so.6
    /lib/i386-*gnu/libpthread-stubs.so.0 /lib/i386-*gnu/libgcc_s.so.1 ./`.
    This is a bug in the glibc test harness.  Should probably use some
    `configure` magic akin to the `fixincludes` stuff (`gcc-4.4
    -print-file-name=libstdc++.so.6`, etc.).

  * `debug/tst-chk4`, `debug/tst-chk5`, `debug/tst-chk6`, `debug/tst-lfschk4`,
    `debug/tst-lfschk5`, `debug/tst-lfschk6`

    Fail in the same way as the C ones, `tst-chk1..3`.

  * `io/ftwtest`, `posix/globtest`, `iconvdata/iconv-test`, `intl/tst-gettext`,
    `malloc/tst-mtrace`, `elf/tst-pathopt`, `iconvdata/tst-tables`,
    `grp/tst_fgetgrent`, `dlfcn/tststatic`, `dlfcn/tststatic2`,
    `posix/wordexp-tst`, `localedata/bug-setlocale1.out`, `posix/tst-getconf`

        /home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.4-486.O/io/ftwtest: error while loading shared libraries: libmachuser.so.1: cannot open shared object file: No such file or directory

    Looking into `localedata/bug-setlocale1.c`, it is clear what it going on:
    only the root of the build directory is added for `--library-path`, but
    none of the other directories that are additionally used.  This is a bug in
    the glibc test harness.  Hacked around by `ln -s mach/libmachuser.so.1
    hurd/libhurduser.so.0.3 ./`.  Hopefully the other instances are similar.

  * `posix/tst-getconf`

    Ends with:

        getconf POSIX_ALLOC_SIZE_MIN /: /home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.4-486/posix/getconf: pathconf: /: Invalid argument

  * `dlfcn/tststatic`, `dlfcn/tststatic2`

    No output, SEGFAULT.

  * `math/test-idouble`, `math/test-ifloat`, `math/test-ildoubl`,
    `math/test-ldouble`

    SIGSEGV.

  * `rt/tst-aio10`, `rt/tst-aio9`

        /home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.4-486.O/rt/tst-aio10.o: In function `do_test':
        tst-aio10.c:(.text+0x1b): undefined reference to `pthread_self'
        tst-aio10.c:(.text+0x78): undefined reference to `pthread_barrier_init'
        tst-aio10.c:(.text+0xf7): undefined reference to `pthread_create'
        tst-aio10.c:(.text+0x10b): undefined reference to `pthread_barrier_wait'
        /home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.4-486.O/rt/tst-aio10.o: In function `tf':
        tst-aio10.c:(.text+0x5ae): undefined reference to `pthread_barrier_wait'
        tst-aio10.c:(.text+0x5ef): undefined reference to `pthread_kill'
        collect2: ld returned 1 exit status
        make[2]: *** [/home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.4-486.O/rt/tst-aio10] Error 1

  * `rt-tst-aio2`, `rt-tst-aio3`, `rt/tst-mqueue3`, `rt/tst-mqueue6`,
    `rt/tst-mqueue8`, `elf/tst-thrlock`, `rt/tst-timer3`,
    `nss//libnss_test1.so`

    Compilation: missing `pthread_attr_init`, `pthread_barrier_init`,
    `pthread_create`, etc.

  * `elf/tst-audit1`, `elf/tst-audit2`

    SIGKILL.

  * `inet/tst-ether_line`

        tst-ether_line.c:19: error: 'ETH_ALEN' undeclared (first use in this function)

    Will either need a `hurd/netinet/if_ether.h` that includes
    `<net/if_ether.h>`, or can do that in the generic `netinet/if_ether.h`?
    See also [[!sourceware_PR 11142]].

  * `gmon/tst-sprofil`

        Floating point exception

  * `posix/bug-regex31-mem`, `posix/tst-fnmatch-mem`

    *output* files: some memory not freed.

  * `assert/test-assert.out`

    Fails sometimes...

  * `stdlib/bug-getcontext.out`

        getcontext failed, errno: 1073741902.

    Is not implemented; see above.  In 8958805c11c741d9211e20612c86271d906c9a0b
    testing, `stdlib/bug-getcontext.out` now says: *Skipping test; no support
    for FP exceptions.*

  * `elf/tst-unique3lib.so`, `elf/tst-unique3lib2.so`, `elf/tst-unique4lib.so`

    Only with GCC 4.4; no longer with 4.5 or 4.6:

        /home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.4-486/elf/tst-unique3lib.os:(.data.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0): undefined reference to `__gxx_personality_v0'

  * `math/test-fenv.out`

    Used to fail (is listed in Debian eglibc-2.13-21's
    `expected-results-i486-gnu-libc`), but something between
    22bcba37dd3b782b1a1ec7bf51da468e48f4d2eb and
    005b7594ffe209639dd1ef2b9ed9a4c22307dec1 causes it to passe -- very likely
    Jérémie's signaling work.

  * `posix/tst-waitid.out`

    Fails sometimes (is listed in Debian eglibc-2.13-21's
    `expected-results-i486-gnu-libc`).

  * `elf/tst-unused-dep.out` (1f393a11f65dcaa1952bdcaf0317a65a5f8aff9d,
    [[!sourceware_PR 13706]], [[!message-id "4F4210C1.1090704@redhat.com"]])

        Unused direct dependencies:
                /home/thomas/tmp/glibc/tschwinge/Roger_Whittaker.build-gcc-4.6-486/dlfcn/libdl.so.2

    As of 8958805c11c741d9211e20612c86271d906c9a0b, this test now passes --
    correct?


## OLD

`configure --without-cvs --prefix= --disable-profile --build=i486-gnu
--host=i486-gnu`

`make -k check` changes from 538603af899057a9ef9583cc447804ec602a45e5 to
c9fd33ef070def49c078c94f8d9bc9f8a8e267f7.

Configured with `--prefix=/usr` instead of `--prefix=`.

Resolved failures:

  * localedata/tst_mblen.out
  * localedata/tst_mbrlen.out
  * localedata/tst_mbrtowc.out
  * localedata/tst_mbsrtowcs.out
  * localedata/tst_mbstowcs.out
  * localedata/tst_mbtowc.out
  * localedata/tst_swscanf.out
  * localedata/tst_wcrtomb.out
  * localedata/tst_wcsrtombs.out
  * localedata/tst_wcstombs.out
  * localedata/tst_wctob.out
  * localedata/tst_wctomb.out
  * localedata/bug-iconv-trans.out
  * localedata/tst-wctype.out
  * math/test-float.out
  * math/test-double.out
  * posix/tst-vfork3-mem
  * io/tst-mkdirat.out

New:

  * A lot of `error while loading shared libraries: libmachuser.so.1: cannot
    open shared object file: No such file or directory`.  Is it perhaps picking
    that library up from `$prefix/lib/`?

    New failures; likely due to that:

      * iconvdata/iconv-test.out
      * iconvdata/tst-tables.out
      * malloc/tst-mtrace.out
      * grp/tst_fgetgrent.out
      * posix/globtest.out
      * posix/wordexp-tst.out
      * io/ftwtest.out
      * elf/tst-pathopt.out

    Changed failures; likely due to that:

      * debug/tst-chk4.out / debug/tst-chk5.out

            -error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory
            +error while loading shared libraries: libpthread-stubs.so.0: cannot open shared object file: No such file or directory

---

Changes to b367d4f996512af6841c3cefdb943cb0a826a6a1: nothing interesting.

---

Changes to b85c54a1f7e5241c1ef99dfeaecbd1bf4117564f: nothing interesting.

New failures:

  * posix/bug-glob3.out (SEGFAULT; but also on Linux)
  * wctype/bug-wctypeh.o (compile error; but also on Linux)