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1997-09-11 04:36 Ulrich Drepper <drepper@cygnus.com> * db2/db_int.h: Define __set_errno if not yet available. * db2/btree/bt_rec.c: Use __set_errno to set errno value. * db2/clib/getlong.c: Likewise. * db2/db185/db185.c: Likewise. * db2/db185/db185_int.h: Likewise. * db2/dbm/dbm.c: Likewise. * db2/lock/lock_deadlock.c: Likewise. * db2/log/log_archive.c: Likewise. * elf/dl-profile.c: Implement mcount function. * gmon/gmon.c: Use __profil not profil because of namespace pollution. * gmon/mcount.c: Remove BSD kernel code. Use compare&swap instruction if possible to change state variable. Optimize frompc folding. * gmon/sys/gmon.h (struct gmonparam): Change state field to long int. * sysdeps/i386/i486/atomicity.h: New file. * sysdeps/stub/atomicity.h: New file. * sysdeps/mach/hurd/profil.c: Define function as __profil and make profil weak alias. * sysdeps/posix/profil.c: Likewise. * string/bits/string2.h: New file. * include/bits/string2.h: New file. * string/Makefile (routines): Add mempcpy. (tests): Add inl-tester. Remove _D__NO_STRING_INLINES from CFLAGS-* variables. * sysdeps/generic/mempcpy.c: New file. * sysdeps/generic/memccpy.c: Undef function name to enable definition as macro. * sysdeps/generic/memchr.c: Likewise. * sysdeps/generic/memcmp.c: Likewise. * sysdeps/generic/memmem.c: Likewise. * sysdeps/generic/memmove.c: Likewise. * sysdeps/generic/strcat.c: Likewise. * sysdeps/generic/strchr.c: Likewise. * sysdeps/generic/strcmp.c: Likewise. * sysdeps/generic/strcpy.c: Likewise. * sysdeps/generic/strcspn.c: Likewise. * sysdeps/generic/strlen.c: Likewise. * sysdeps/generic/strncat.c: Likewise. * sysdeps/generic/strncmp.c: Likewise. * sysdeps/generic/strncpy.c: Likewise. * sysdeps/generic/strpbrk.c: Likewise. * sysdeps/generic/strrchr.c: Likewise. * sysdeps/generic/strsep.c: Likewise. * sysdeps/generic/strspn.c: Likewise. * sysdeps/generic/strstr.c: Likewise. * sysdeps/generic/strtok.c: Likewise. * sysdeps/generic/strtok_r.c: Likewise. * sysdeps/i386/memset.c: Likewise. * sysdeps/i386/bits/string.h: Correct a few types and constraints. * sysdeps/i386/i486/bits/string.h: Heavy rewrites and optimizations. * string/stratcliff.c: Undefine __USE_STRING_INLINES. * string/tst-strlen.c: Likewise. * string/string.h: Add prototype for mempcpy. Include bits/string2.h header always if optimizing. * intl/dcgettext.c: Don't unconditionally define stpcpy, only if not yet defined. * intl/l10nflist.c: Likewise. * string/tester.c: Add copyright and make little cleanups. * inet/test_ifindex.c: Change type of ni variable to unsigned int. * locale/programs/ld-ctype.c (struct locale_ctype_t): Change type of fields map_collection_max and map_collection_act to size_t. * nss/libnss_files.map: Group entries. * posix/unistd.h: Add prototype for __setpgid and __profil. * sysdeps/generic/crypt.h: Declare __crypt_r. * sysdeps/i386/bits/select.h: Fix fatal bugs, use correct casts now. * sysdeps/i386/fpu/bits/mathinline.h (isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered): Optimize a bit. * sysdeps/stub/ftruncate.c: Include missing header for prototype. * sysdeps/stub/getdents.c: Likewise. * sysdeps/stub/reboot.c: Likewise. * sysdeps/stub/swapon.c: Likewise. * sysdeps/stub/syscall.c: Likewise. * sysdeps/stub/ualarm.c: Likewise. * sysdeps/stub/usleep.c: Likewise. * sysdeps/unix/sysv/linux/if_index.c: Don't compile or use opensock if SIOGIFINDEX and SIOGIFNAME are not defined. * sysdeps/unix/sysv/linux/net/if.h: Add IFF_PORTSEL and IFF_AUTOMEDIA according to recent kernel changes. 1997-09-10 21:32 Klaus Espenlaub <kespenla@student.informatik.uni-ulm.de> * Makeconfig: Use $(have-initfini) instead of $(elf) to figure out the installed name of the startup code. (common-generated): Add version.mk. * Makefile (distclean-1): Add glibcbug. * Makerules: Replace -lgcc by $(gnulib). * catgets/Makefile (generated): Add xmalloc.o. * csu/Makefile (generated): Replace align.h and end.h by defs.h to match the generated file. * manual/Makefile (mostlyclean): Add stub-manual and stamp.o. (realclean): Changed to remove chapters-incl[12]. * po/Makefile (realclean): New rule to remove the generated .mo files. * time/Makefile: Only include zonefile dependencies if $(no_deps) is not true to avoid make clean failure when directory time doesn't exist yet. (generated): Add tzselect. * stdio/fgets.c (fgets): Add casts to reduce gcc warning noise. * stdio/internals.c (flushbuf): Likewise. * stdio/linewrap.c (lwupdate): Likewise. * stdio/memstream.c (enlarge_buffer): Likewise. * stdio-common/vfscanf.c (_IO_vfscanf): Likewise. * time/tzset.c (compute_change): Likewise. * misc/init-misc.c (__init_misc): Only declare static if HAVE_GNU_LD is defined. * sysdeps/posix/pipestream.c (FUNC): Change to generate ANSI C style functions. * sysdeps/stub/init-posix.c: Likewise. * sysdeps/stub/profil.c: Likewise. * munch-tmpl.c (__libc_init): Convert to ANSI C style declaration to reduce gcc warning noise. * stdio/glue.c (_filbuf, _flsbuf): Likewise. * stdio/obstream.c (grow, seek, input, init_obstream): Likewise. * stdio/vasprintf.c (enlarge_buffer): Likewise. * sysdeps/generic/sysd-stdio.c (__stdio_read, __stdio_write, __stdio_seek, __stdio_close, __stdio_fileno, __stdio_open, __stdio_reopen): Likewise. * sysdeps/posix/defs.c (_cleanup): Likewise. * time/offtime.c (__offtime): Add cast. * posix/getopt.c: Don't use text_set_element if not defined. * configure.in: Provide a check for underscores before user labels that works even when the compiler used for building doesn't work (like when there is no C library). Use the old way if the compiler works. 1997-09-10 05:08 David S. Miller <davem@caip.rutgers.edu> * sysdeps/unix/sysv/linux/sparc/bits/ioctls.h: The TC* ioctls use 'T' not 't' on SparcLinux. * sysdeps/unix/sysv/linux/sparc/bits/termios.h: tcflag_t is 32 bits. * sysdeps/unix/sysv/linux/sparc/sparc64/longjmp.S: Add aliases for _longjmp and siglongjmp. 1997-09-09 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * libio/stdio.h: Add format attributes to the extra printf and scanf like functions. * stdio/stdio.h: Likewise. 1997-09-09 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * nis/nss_nisplus/nisplus-network.c (_nss_nisplus_getnetbyaddr_r): Print tablename_val, not tablename_len. * nis/nss_nisplus/nisplus-ethers.c (_nss_nisplus_getntohost_r): Use sprintf instead of sprintf, the string always fits. * nis/nss_nisplus/nisplus-hosts.c (_nss_nisplus_gethostbyaddr_r): Likewise. * nis/nss_nisplus/nisplus-network.c (_nss_nisplus_getnetbyaddr_r): Likewise. * nis/nss_nisplus/nisplus-proto.c (_nss_nisplus_getprotobynumber_r): Likewise. * nis/nss_nisplus/nisplus-rpc.c (_nss_nisplus_getrpcbynumber_r): Likewise. * nis/nss_nisplus/nisplus-service.c (_nss_nisplus_getservbynumber_r): Likewise. * nis/nss_nisplus/nisplus-alias.c (_nss_create_tablename): Use __stpcpy, __stpncpy and __strdup instead of public names. * nis/nss_nisplus/nisplus-ethers.c (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-grp.c (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-hosts.c (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-netgrp.c (_nss_nisplus_parse_netgroup): Likewise. * nis/nss_nisplus/nisplus-network.c (_nss_nisplus_parse_netent): Likewise. (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-proto.c (_nss_nisplus_parse_protoent): Likewise. (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-pwd.c (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-rpc.c (_nss_nisplus_parse_rpcent): Likewise. (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-service.c (_nss_nisplus_parse_servent): Likewise. (_nss_create_tablename): Likewise. * nis/nss_nisplus/nisplus-spwd.c (_nss_create_tablename): Likewise. * libc.map: Export __stpcpy and __strdup. 1997-09-09 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * math/Makefile (CFLAGS-test-float.c, CFLAGS-test-double.c, CFLAGS-test-ldouble.c): Pass -ffloat-store to avoid excessive precision. 1997-09-09 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * include/rpc/auth_des.h: New file. 1997-09-09 Paul Eggert <eggert@twinsun.com> * time/mktime.c (__mktime_internal): Declare sec_requested even if !LEAP_SECONDS_POSSIBLE, since it's needed at the end when checking for time_t overflow. 1997-09-09 22:11 Ulrich Drepper <drepper@cygnus.com> * sysdeps/posix/getcwd.c: Correct test for too small buffer. Reported by Erik Troan <ewt@redhat.com>. * elf/dl-close.c: Include <bits/libc-lock.h>, not <libc-lock.h>. * elf/dl-open.c: Likewise. 1997-09-07 17:09 Richard Henderson <rth@cygnus.com> * sysdeps/alpha/Makefile: Kill setjmp_aux. * sysdeps/alpha/bits/setjmp.h: Rewrite in terms of an array. * sysdeps/alpha/__longjmp.c: Remove. * sysdeps/alpha/setjmp_aux.c: Remove. * sysdeps/alpha/__longjmp.S: New file. * sysdeps/alpha/bsd-_setjmp.S: Stub out. * sysdeps/alpha/bsd-setjmp.S: Likewise. * sysdeps/alpha/setjmp.S: Do the work; don't call __setjmp_aux. Move _setjmp and setjmp from bsd-*.S. 1997-09-06 20:20 Ulrich Drepper <drepper@cygnus.com> * include/rpc/auth.h: New file. * include/rpc/auth_unix.h: New file. 1997-09-06 Paul Eggert <eggert@twinsun.com> Fix gmtime so that it reports leap seconds when TZ indicates that leap seconds are desired. * time/gmtime.c (<stddef.h>): Remove unnecessary include. (gmtime): Put after gmtime_r, to help the compiler inline. (__tz_convert): New decl. (gmtime_r): Use __tz_convert instead of __offtime, so that leap seconds are handled correctly. * time/localtime.c (<errno.h>, <libc-lock.h>): Remove includes that are now unnecessary. (__tzset_internal, __tz_compute, __tzfile_compute, __use_tzfile, __tzset_lock): Remove extern decls that are now unnecessary. (localtime_internal): Moved to __tz_convert in tzset.c. so that localtime and gmtime can both use it easily. (localtime): Put after localtime_r, to help the compiler inline. (localtime_r): Use __tz_convert instead of localtime_internal. * time/strftime.c (__tz_compute): Remove unused (and now incorrect) decl. * time/tzfile.c (__tzfile_compute): New arg USE_LOCALTIME. * time/tzset.c (<errno.h>): Include. (_tmbuf): New decl. (__tzfile_compute): New function. (tz_compute): Renamed from __tz_compute. No longer extern. Remove redundant call to tzset_internal. (tzset_internal): Renamed from __tzset_internal. No longer extern. (tzset_lock): Renamed from __tzset_lock. No longer extern. (__tz_convert): New function, containing functionality of old localtime_internal function, plus locking and optional UTC. 1997-09-06 Paul Eggert <eggert@twinsun.com> * time/tzfile.c (__tzfile_read): Don't read a file if TZ is the empty string, just use UTC without leap seconds. This is for compatibility with the Olson code. 1997-09-06 Paul Eggert <eggert@twinsun.com> * time/tzset.c (__tzname_max): Lock tz data structures before invoking tzset_internal. * time/tzfile.c: Define compute_tzname_max statically. 1997-09-07 10:57 Thorsten Kukuk <kukuk@vt.uni-paderborn.de> * nis/nis_call.c: Remove not longer necessary HAVE_SECURE_RPC ifdefs. * nis/nis_intern.h: Likewise. * nis/nss_nis/nis-publickey.c: Likewise. * nis/nss_nisplus/nisplus-publickey.c: Likewise. * nis/ypclnt.c: Likewise. * sunrpc/auth_des.c: Don't dereference NULL pointer, initialize ad->ad_timediff. * sunrpc/auth_none.c: Don't define our own prototypes, use the one from the header files. * sunrpc/auth_unix.c: Likewise. * sunrpc/clnt_raw.c: Likewise. * sunrpc/clnt_tcp.c: Likewise. * sunrpc/rpc_cmsg.c: Likewise. * sunrpc/key_call.c: Fix signal handling. * sunrpc/openchild.c: Don't use /bin/sh to start /usr/etc/keyenvoy, or we will get a deadlock with NIS+. * sunrpc/rpc/auth.h: Add prototype for xdr_opaque_auth, don't define HAVE_SECURE_RPC. 1997-09-07 15:51 Ulrich Drepper <drepper@cygnus.com> * sysdeps/i386/bits/select.h [__GNUC__] (__FD_ZERO, __FD_SET, __FD_CLR, __FD_ISSET): Use correct casts to address array correctly. Reported by urbanw@cs.umu.se. 1997-09-07 05:07 Ulrich Drepper <drepper@cygnus.com> * elf/dl-close.c: Include <bits/libc-lock.h>, not <libc-lock.h>. * elf/dl-open.c: Likewise. * sysdeps/i386/memset.c: Undefine memset in case the header with the optimized functions is included. Patches by NIIBE Yutaka <gniibe@mri.co.jp>. * sysdeps/i386/bits/string.h [__PIC__] (strcspn, strspn, strpbrk, strsep): Use register for second parameter. * sysdeps/i386/i486/bits/string.h: Likewise. Reported by NIIBE Yutaka <gniibe@mri.co.jp>. 1997-09-03 09:48 Geoff Keating <geoffk@ozemail.com.au> * math/libm-test.c: Change various tolerances to match what the tested routines can actually provide. * math/Makefile: Add new tests. * math/atest-sincos.c: New file. * math/atest-exp.c: New file. * csu/Makefile: Give initfini.s and initfiniS.s their own CFLAGS-* macros so they can be overridden. * sysdeps/powerpc/Makefile [subdir=csu]: Override flags for initfiniS.s to use -fpic instead of -fPIC, because the sed script breaks otherwise. * sysdeps/powerpc/Makefile [build-shared]: Use -fpic not -fPIC for efficiency. * sysdeps/powerpc/dl-machine.h (ELF_MACHINE_RUNTIME_TRAMPOLINE): Don't use register 0, to let _mcount be in a shared object. * sysdeps/powerpc/dl-machine.h: Use full sentences in comments. Generally clean up. Suppress some code we don't need when relocating ld.so. * sysdeps/powerpc/test-arith.c: Change loop indices to size_t when appropriate to suppress gcc warning. * resolv/res_send.c: Suppress warning. * sunrpc/xdr_sizeof.c: Suppress warning. * FAQ: Add ppc-linux. * manual/maint.texi: Add ppc-linux. Explain that gcc can't build it yet. * sysdeps/unix/sysv/linux/powerpc/profil-counter.h: Correct for current kernels. 1997-08-15 07:45 Geoff Keating <geoffk@ozemail.com.au> * stdlib/fmtmsg.c: Use two parameters for __libc_once_define. * sysdeps/i386/machine-gmon.h: Correct typo. * sysdeps/unix/sysv/linux/powerpc/bits/mman.h: Change to match kernel. * sysdeps/generic/dl-sysdep.c: Add hook for bizzare PPC argument hack. * sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c: Rewrite to use sysdeps/linux/dl-sysdep.c. * sysdeps/powerpc/Makefile [subdir=gmon]: Compile ppc-mcount. * sysdeps/powerpc/machine-gmon.h: Use ppc-mcount. * sysdeps/powerpc/ppc-mcount: New file. The following are mostly changes to allow profiling: * sysdeps/powerpc/add_n.S: Added. * sysdeps/powerpc/add_n.s: Removed. * sysdeps/powerpc/addmul_1.S: Added. * sysdeps/powerpc/addmul_1.s: Removed. * sysdeps/powerpc/bsd-_setjmp.S: Use JUMPTARGET macro. * sysdeps/powerpc/bsd-setjmp.S: Use JUMPTARGET macro. * sysdeps/powerpc/lshift.S: Added. * sysdeps/powerpc/lshift.s: Removed. * sysdeps/powerpc/memset.S: Added. * sysdeps/powerpc/memset.s: Removed. * sysdeps/powerpc/mul_1.S: Added. * sysdeps/powerpc/mul_1.s: Removed. * sysdeps/powerpc/rshift.S: Added. * sysdeps/powerpc/rshift.s: Removed. * sysdeps/powerpc/s_copysign.S: Use ENTRY, END, weak_alias macros. * sysdeps/powerpc/s_fabs.S: Use ENTRY, END, weak_alias macros. * sysdeps/powerpc/setjmp.S: Use JUMPTARGET macro. * sysdeps/powerpc/strchr.S: Added. * sysdeps/powerpc/strchr.s: Removed. * sysdeps/powerpc/strcmp.S: Added. * sysdeps/powerpc/strcmp.s: Removed. * sysdeps/powerpc/strlen.S: Added. * sysdeps/powerpc/strlen.s: Removed. * sysdeps/powerpc/sub_n.S: Added. * sysdeps/powerpc/sub_n.s: Removed. * sysdeps/powerpc/submul_1.S: Added. * sysdeps/powerpc/submul_1.s: Removed. * sysdeps/unix/sysv/linux/powerpc/_exit.S: Removed. * sysdeps/unix/sysv/linux/powerpc/brk.S: Added. * sysdeps/unix/sysv/linux/powerpc/brk.c: Removed. * sysdeps/unix/sysv/linux/powerpc/clone.S: Use new macros. Fix various bugs. Document that it isn't tested. * sysdeps/unix/sysv/linux/powerpc/sigreturn.S: Make look like sysdeps/unix/_exit.S. * sysdeps/unix/sysv/linux/powerpc/socket.S: Use new macros. * sysdeps/unix/sysv/linux/powerpc/syscall.S: Use new macros. * sysdeps/unix/sysv/linux/powerpc/sysdep.h: Define some new macros to make assembler (possibly) more portable, allow profiling, etc.
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702 lines
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Frequently Asked Question on GNU C Library
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As every FAQ this one also tries to answer questions the user might have
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when using the package. Please make sure you read this before sending
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questions or bug reports to the maintainers.
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The GNU C Library is very complex. The building process exploits the
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features available in tools generally available. But many things can
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only be done using GNU tools. Also the code is sometimes hard to
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understand because it has to be portable but on the other hand must be
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fast. But you need not understand the details to use GNU C Library.
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This will only be necessary if you intend to contribute or change it.
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If you have any questions you think should be answered in this document,
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please let me know.
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--drepper@cygnus.com
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q1] ``What systems does the GNU C Library run on?''
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[Q2] ``What compiler do I need to build GNU libc?''
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[Q3] ``When starting make I get only error messages.
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What's wrong?''
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[Q4] ``After I changed configure.in I get `Autoconf version X.Y.
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or higher is required for this script'. What can I do?''
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[Q5] ``Do I need a special linker or archiver?''
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[Q6] ``Do I need some more things to compile GNU C Library?''
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[Q7] ``When I run `nm -u libc.so' on the produced library I still
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find unresolved symbols? Can this be ok?''
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[Q8] ``Can I replace the libc on my Linux system with GNU libc?''
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[Q9] ``I expect GNU libc to be 100% source code compatible with
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the old Linux based GNU libc. Why isn't it like this?''
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[Q10] ``Why does getlogin() always return NULL on my Linux box?''
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[Q11] ``Where are the DST_* constants found in <sys/time.h> on many
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systems?''
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[Q12] ``The `gencat' utility cannot process the input which are
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successfully used on my Linux libc based system. Why?''
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[Q13] ``How do I configure GNU libc so that the essential libraries
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like libc.so go into /lib and the other into /usr/lib?''
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[Q14] ``When linking with the new libc I get unresolved symbols
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`crypt' and `setkey'. Why aren't these functions in the
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libc anymore?''
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[Q15] ``What are these `add-ons'?''
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[Q16] ``When I use GNU libc on my Linux system by linking against
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to libc.so which comes with glibc all I get is a core dump.''
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[Q17] ``Looking through the shared libc file I haven't found the
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functions `stat', `lstat', `fstat', and `mknod' and while
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linking on my Linux system I get error messages. How is
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this supposed to work?''
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[Q18] ``The prototypes for `connect', `accept', `getsockopt',
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`setsockopt', `getsockname', `getpeername', `send',
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`sendto', and `recvfrom' are different in GNU libc than
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on any other system I saw. This is a bug, isn't it?''
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[Q19] ``My XXX kernel emulates a floating-point coprocessor for me.
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Should I enable --with-fp?''
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[Q20] ``How can I compile gcc 2.7.2.1 from the gcc source code using
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glibc 2.x?
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[Q21] ``On Linux I've got problems with the declarations in Linux
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kernel headers.''
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[Q22] ``When I try to compile code which uses IPv6 header and
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definitions on my Linux 2.x.y system I am in trouble.
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Nothing seems to work.''
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[Q23] ``When compiling GNU libc I get lots of errors saying functions
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in glibc are duplicated in libgcc.''
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[Q24] ``I have set up /etc/nis.conf, and the Linux libc 5 with NYS
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works great. But the glibc NIS+ doesn't seem to work.''
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q1] ``What systems does the GNU C Library run on?''
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[A1] {UD} This is difficult to answer. The file `README' lists the
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architectures GNU libc is known to run *at some time*. This does not
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mean that it still can be compiled and run on them in the moment.
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The systems glibc is known to work on in the moment and most probably
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in the future are:
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*-*-gnu GNU Hurd
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i[3456]86-*-linux-gnu Linux-2.0 on Intel
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m68k-*-linux-gnu Linux-2.0 on Motorola 680x0
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alpha-*-linux-gnu Linux-2.0 on DEC Alpha
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powerpc-*-linux-gnu Linux and MkLinux on PowerPC systems
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Other Linux platforms are also on the way to be supported but I need
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some success reports first.
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If you have a system not listed above (or in the `README' file) and
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you are really interested in porting it, contact
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<bug-glibc@prep.ai.mit.edu>
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q2] ``What compiler do I need to build GNU libc?''
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[A2] {UD} It is (almost) impossible to compile GNU C Library using a
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different compiler than GNU CC. A lot of extensions of GNU CC are
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used to increase the portability and speed.
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But this does not mean you have to use GNU CC for using the GNU C
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Library. In fact you should be able to use the native C compiler
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because the success only depends on the binutils: the linker and
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archiver.
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The GNU CC is found like all other GNU packages on
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ftp://prep.ai.mit.edu/pub/gnu
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or better one of the many mirror sites.
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You always should try to use the latest official release. Older
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versions might not have all the features GNU libc could use.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q3] ``When starting `make' I get only errors messages.
|
||
What's wrong?''
|
||
|
||
[A3] {UD} You definitely need GNU make to translate GNU libc. No
|
||
other make program has the needed functionality.
|
||
|
||
Versions before 3.74 have bugs which prevent correct execution so you
|
||
should upgrade to the latest version before starting the compilation.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q4] ``After I changed configure.in I get `Autoconf version X.Y.
|
||
or higher is required for this script'. What can I do?''
|
||
|
||
[A4] {UD} You have to get the specified autoconf version (or a later)
|
||
from your favourite mirror of prep.ai.mit.edu.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q5] ``Do I need a special linker or archiver?''
|
||
|
||
[A5] {UD} If your native versions are not too buggy you can probably
|
||
work with them. But GNU libc works best with GNU binutils.
|
||
|
||
On systems where the native linker does not support weak symbols you
|
||
will not get a really ISO C compliant C library. Generally speaking
|
||
you should use the GNU binutils if they provide at least the same
|
||
functionality as your system's tools.
|
||
|
||
Always get the newest release of GNU binutils available.
|
||
Older releases are known to have bugs that affect building the GNU C
|
||
Library.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q6] ``Do I need some more things to compile GNU C Library?''
|
||
|
||
[A6] {UD} Yes, there are some more :-).
|
||
|
||
* GNU gettext; the GNU libc is internationalized and partly localized.
|
||
For bringing the messages for the different languages in the needed
|
||
form the tools from the GNU gettext package are necessary. See
|
||
ftp://prep.ai.mit.edu/pub/gnu or better any mirror site.
|
||
|
||
* lots of diskspace (for i?86-linux this means, e.g., ~170MB; for ppc-linux
|
||
even ~200MB).
|
||
|
||
You should avoid compiling on a NFS mounted device. This is very
|
||
slow.
|
||
|
||
* plenty of time (approx 1h for i?86-linux on i586@133 or 2.5h on
|
||
i486@66 or 4.5h on i486@33), both for shared and static only).
|
||
For Hurd systems times are much higher.
|
||
|
||
For Atari Falcon (Motorola 68030 @ 16 Mhz, 14 Mb memory) James Troup
|
||
<J.J.Troup@comp.brad.ac.uk> reports for a full build (shared, static,
|
||
and profiled) a compile time of 45h34m.
|
||
|
||
If you have some more measurements let me know.
|
||
|
||
* When compiling for Linux:
|
||
|
||
+ the header files of the Linux kernel must be available in the
|
||
search path of the CPP as <linux/*.h> and <asm/*.h>.
|
||
|
||
* Some files depend on special tools. E.g., files ending in .gperf
|
||
need a `gperf' program. The GNU version (part of libg++) is known
|
||
to work while some vendor versions do not.
|
||
|
||
You should not need these tools unless you change the source files.
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q7] ``When I run `nm -u libc.so' on the produced library I still
|
||
find unresolved symbols? Can this be ok?''
|
||
|
||
[A7] {UD} Yes, this is ok. There can be several kinds of unresolved
|
||
symbols:
|
||
|
||
* magic symbols automatically generated by the linker. Names are
|
||
often like __start_* and __stop_*
|
||
|
||
* symbols starting with _dl_* come from the dynamic linker
|
||
|
||
* symbols resolved by using libgcc.a
|
||
(__udivdi3, __umoddi3, or similar)
|
||
|
||
* weak symbols, which need not be resolved at all
|
||
(currently fabs among others; this gets resolved if the program
|
||
is linked against libm, too.)
|
||
|
||
Generally, you should make sure you find a real program which produces
|
||
errors while linking before deciding there is a problem.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q8] ``Can I replace the libc on my Linux system with GNU libc?''
|
||
|
||
[A8] {UD} You cannot replace any existing libc for Linux with GNU
|
||
libc. There are different versions of C libraries and you can run
|
||
libcs with different major version independently.
|
||
|
||
For Linux there are today two libc versions:
|
||
libc-4 old a.out libc
|
||
libc-5 current ELF libc
|
||
|
||
GNU libc will have the major number 6 and therefore you can have this
|
||
additionally installed. For more information consult documentation for
|
||
shared library handling. The Makefiles of GNU libc will automatically
|
||
generate the needed symbolic links which the linker will use.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q9] ``I expect GNU libc to be 100% source code compatible with
|
||
the old Linux based GNU libc. Why isn't it like this?''
|
||
|
||
[A9] {DMT,UD} Not every extension in Linux libc's history was well
|
||
thought-out. In fact it had a lot of problems with standards compliance
|
||
and with cleanliness. With the introduction of a new version number these
|
||
errors now can be corrected. Here is a list of the known source code
|
||
incompatibilities:
|
||
|
||
* _GNU_SOURCE: glibc does not automatically define _GNU_SOURCE. Thus,
|
||
if a program depends on GNU extensions or some other non-standard
|
||
functionality, it is necessary to compile it with C compiler option
|
||
-D_GNU_SOURCE, or better, to put `#define _GNU_SOURCE' at the beginning
|
||
of your source files, before any C library header files are included.
|
||
This difference normally manifests itself in the form of missing
|
||
prototypes and/or data type definitions. Thus, if you get such errors,
|
||
the first thing you should do is try defining _GNU_SOURCE and see if
|
||
that makes the problem go away.
|
||
|
||
For more information consult the file `NOTES' part of the GNU C
|
||
library sources.
|
||
|
||
* reboot(): GNU libc sanitizes the interface of reboot() to be more
|
||
compatible with the interface used on other OSes. In particular,
|
||
reboot() as implemented in glibc takes just one argument. This argument
|
||
corresponds to the third argument of the Linux reboot system call.
|
||
That is, a call of the form reboot(a, b, c) needs to be changed into
|
||
reboot(c).
|
||
Beside this the header <sys/reboot.h> defines the needed constants
|
||
for the argument. These RB_* constants should be used instead of the
|
||
cryptic magic numbers.
|
||
|
||
* swapon(): the interface of this function didn't changed, but the
|
||
prototype is in a separate header file <sys/swap.h>. For the additional
|
||
argument of swapon() you should use the SWAP_* constants from
|
||
<linux/swap.h>, which get defined when <sys/swap.h> is included.
|
||
|
||
* errno: If a program uses variable "errno", then it _must_ include header
|
||
file <errno.h>. The old libc often (erroneously) declared this variable
|
||
implicitly as a side-effect of including other libc header files. glibc
|
||
is careful to avoid such namespace pollution, which, in turn, means that
|
||
you really need to include the header files that you depend on. This
|
||
difference normally manifests itself in the form of the compiler
|
||
complaining about the references of the undeclared symbol "errno".
|
||
|
||
* Linux-specific syscalls: All Linux system calls now have appropriate
|
||
library wrappers and corresponding declarations in various header files.
|
||
This is because the syscall() macro that was traditionally used to
|
||
work around missing syscall wrappers are inherently non-portable and
|
||
error-prone. The following tables lists all the new syscall stubs,
|
||
the header-file declaring their interface and the system call name.
|
||
|
||
syscall name: wrapper name: declaring header file:
|
||
------------- ------------- ----------------------
|
||
bdflush bdflush <sys/kdaemon.h>
|
||
create_module create_module <sys/module.h>
|
||
delete_module delete_module <sys/module.h>
|
||
get_kernel_syms get_kernel_syms <sys/module.h>
|
||
init_module init_module <sys/module.h>
|
||
syslog ksyslog_ctl <sys/klog.h>
|
||
|
||
* lpd: Older versions of lpd depend on a routine called _validuser().
|
||
The library does not provide this function, but instead provides
|
||
__ivaliduser() which has a slightly different interfaces. Simply
|
||
upgrading to a newer lpd should fix this problem (e.g., the 4.4BSD
|
||
lpd is known to be working).
|
||
|
||
* resolver functions/BIND: like on many other systems the functions of
|
||
the resolver library are not included in the libc itself. There is
|
||
a separate library libresolv. If you find some symbols starting with
|
||
`res_*' undefined simply add -lresolv to your call of the linker.
|
||
|
||
* the `signal' function's behaviour corresponds to the BSD semantic and
|
||
not the SysV semantic as it was in libc-5. The interface on all GNU
|
||
systems shall be the same and BSD is the semantic of choice. To use
|
||
the SysV behaviour simply use `sysv_signal'. The major difference is
|
||
that the SysV implementation sets the SA_ONESHOT flag and so the handler
|
||
gets removed after the first call.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q10] ``Why does getlogin() always return NULL on my Linux box?''
|
||
|
||
[A10] {UD} The GNU C library has a format for the UTMP and WTMP file
|
||
which differs from what your system currently has. It was extended to
|
||
fulfill the needs of the next years when IPv6 is introduced. So the
|
||
record size is different, fields might have a different position and
|
||
so reading the files written by functions from the one library cannot
|
||
be read by functions from the other library. Sorry, but this is what
|
||
a major release is for. It's better to have a cut now than having no
|
||
means to support the new techniques later.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q11] ``Where are the DST_* constants found in <sys/time.h> on many
|
||
systems?''
|
||
|
||
[A11] {UD} These constants come from the old BSD days and are not used
|
||
today anymore (even the Linux based glibc does not implement the handling
|
||
although the constants are defined).
|
||
|
||
Instead GNU libc contains the zone database handling and compatibility
|
||
code for POSIX TZ environment variable handling.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q12] ``The `gencat' utility cannot process the input which are
|
||
successfully used on my Linux libc based system. Why?''
|
||
|
||
[A12] {UD} Unlike the author of the `gencat' program which is distributed
|
||
with Linux libc I have read the underlying standards before writing the
|
||
code. It is completely compatible with the specification given in
|
||
X/Open Portability Guide.
|
||
|
||
To ease the transition from the Linux version some of the non-standard
|
||
features are also present in the `gencat' program of GNU libc. This
|
||
mainly includes the use of symbols for the message number and the automatic
|
||
generation of header files which contain the needed #defines to map the
|
||
symbols to integers.
|
||
|
||
Here is a simple SED script to convert at least some Linux specific
|
||
catalog files to the XPG4 form:
|
||
|
||
-----------------------------------------------------------------------
|
||
# Change catalog source in Linux specific format to standard XPG format.
|
||
# Ulrich Drepper <drepper@cygnus.com>, 1996.
|
||
#
|
||
/^\$ #/ {
|
||
h
|
||
s/\$ #\([^ ]*\).*/\1/
|
||
x
|
||
s/\$ #[^ ]* *\(.*\)/\$ \1/
|
||
}
|
||
|
||
/^# / {
|
||
s/^# \(.*\)/\1/
|
||
G
|
||
s/\(.*\)\n\(.*\)/\2 \1/
|
||
}
|
||
-----------------------------------------------------------------------
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q13] ``How do I configure GNU libc so that the essential libraries
|
||
like libc.so go into /lib and the other into /usr/lib?''
|
||
|
||
[A13] {UD,AJ} Like all other GNU packages GNU libc is configured to
|
||
use a base directory and install all files relative to this. If you
|
||
intend to really use GNU libc on your system this base directory is
|
||
/usr. I.e., you run
|
||
configure --prefix=/usr <other_options>
|
||
|
||
Some systems like Linux have a filesystem standard which makes a
|
||
difference between essential libraries and others. Essential
|
||
libraries are placed in /lib because this directory is required to be
|
||
located on the same disk partition as /. The /usr subtree might be
|
||
found on another partition/disk.
|
||
|
||
To install the essential libraries which come with GNU libc in /lib
|
||
one must explicitly tell this (except on Linux, see below). Autoconf
|
||
has no option for this so you have to use the file where all user
|
||
supplied additional information should go in: `configparms' (see the
|
||
`INSTALL' file). Therefore the `configparms' file should contain:
|
||
|
||
slibdir=/lib
|
||
sysconfdir=/etc
|
||
|
||
The first line specifies the directory for the essential libraries,
|
||
the second line the directory for file which are by tradition placed
|
||
in a directory named /etc.
|
||
|
||
No rule without an exception: If you configure for Linux with
|
||
--prefix=/usr, then slibdir and sysconfdir will automatically be
|
||
defined as stated above.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q14] ``When linking with the new libc I get unresolved symbols
|
||
`crypt' and `setkey'. Why aren't these functions in the
|
||
libc anymore?''
|
||
|
||
[A14] {UD} Remember the US restrictions of exporting cryptographic
|
||
programs and source code. Until this law gets abolished we cannot
|
||
ship the cryptographic function together with the libc.
|
||
|
||
But of course we provide the code and there is an very easy way to use
|
||
this code. First get the extra package. People in the US way get it
|
||
from the same place they got the GNU libc from. People outside the US
|
||
should get the code from ftp://ftp.ifi.uio.no/pub/gnu, or another
|
||
archive site outside the USA. The README explains how to install the
|
||
sources.
|
||
|
||
If you already have the crypt code on your system the reason for the
|
||
failure is probably that you failed to link with -lcrypt. The crypto
|
||
functions are in a separate library to make it possible to export GNU
|
||
libc binaries from the US.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q15] ``What are these `add-ons'?''
|
||
|
||
[A15] {UD} To avoid complications with export rules or external source
|
||
code some optional parts of the libc are distributed as separate
|
||
packages (e.g., the crypt package, see Q14).
|
||
|
||
To ease the use as part of GNU libc the installer just has to unpack
|
||
the package and tell the configuration script about these additional
|
||
subdirectories using the --enable-add-ons option. When you add the
|
||
crypt add-on you just have to use
|
||
|
||
configure --enable-add-ons=crypt,XXX ...
|
||
|
||
where XXX are possible other add-ons and ... means the rest of the
|
||
normal option list.
|
||
|
||
You can use add-ons also to overwrite some files in glibc. The add-on
|
||
system dependent subdirs are search first. It is also possible to add
|
||
banner files (use a file named `Banner') or create shared libraries.
|
||
|
||
Using add-ons has the big advantage that the makefiles of the GNU libc
|
||
can be used. Only some few stub rules must be written to get
|
||
everything running. Even handling of architecture dependent
|
||
compilation is provided. The GNU libc's sysdeps/ directory shows how
|
||
to use this feature.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q16] ``When I use GNU libc on my Linux system by linking against
|
||
to libc.so which comes with glibc all I get is a core dump.''
|
||
|
||
[A16] {UD} It is not enough to simply link against the GNU libc
|
||
library itself. The GNU C library comes with its own dynamic linker
|
||
which really conforms to the ELF API standard. This dynamic linker
|
||
must be used.
|
||
|
||
Normally this is done by the compiler. The gcc will use
|
||
|
||
-dynamic-linker /lib/ld-linux.so.1
|
||
|
||
unless the user specifies her/himself a -dynamic-linker argument. But
|
||
this is not the correct name for the GNU dynamic linker. The correct
|
||
name is /lib/ld.so.1 which is the name specified in the SVr4 ABi.
|
||
|
||
To change your environment to use GNU libc for compiling you need to
|
||
change the `specs' file of your gcc. This file is normally found at
|
||
|
||
/usr/lib/gcc-lib/<arch>/<version>/specs
|
||
|
||
In this file you have to change a few things:
|
||
|
||
- change `ld-linux.so.1' to `ld.so.1' (or to ld-linux.so.2, see below)
|
||
|
||
- remove all expression `%{...:-lgmon}'; there is no libgmon in glibc
|
||
|
||
|
||
Things are getting a bit more complicated if you have GNU libc
|
||
installed in some other place than /usr, i.e., if you do not want to
|
||
use it instead of the old libc. In this case the needed startup files
|
||
and libraries are not found in the regular places. So the specs file
|
||
must tell the compiler and linker exactly what to use. Here is for
|
||
example the gcc-2.7.2 specs file when GNU libc is installed at
|
||
/usr:
|
||
|
||
-----------------------------------------------------------------------
|
||
*asm:
|
||
%{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}
|
||
|
||
*asm_final:
|
||
%{pipe:-}
|
||
|
||
*cpp:
|
||
%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}
|
||
|
||
*cc1:
|
||
%{profile:-p}
|
||
|
||
*cc1plus:
|
||
|
||
|
||
*endfile:
|
||
%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s
|
||
|
||
*link:
|
||
-m elf_i386 %{shared:-shared} %{!shared: %{!ibcs: %{!static: %{rdynamic:-export-dynamic} %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} %{static:-static}}}
|
||
|
||
*lib:
|
||
%{!shared: %{pthread:-lpthread} %{profile:-lc_p} %{!profile: -lc}}
|
||
|
||
*libgcc:
|
||
-lgcc
|
||
|
||
*startfile:
|
||
%{!shared: %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:%{profile:gcrt1.o%s} %{!profile:crt1.o%s}}}} crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}
|
||
|
||
*switches_need_spaces:
|
||
|
||
|
||
*signed_char:
|
||
%{funsigned-char:-D__CHAR_UNSIGNED__}
|
||
|
||
*predefines:
|
||
-D__ELF__ -Dunix -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)
|
||
|
||
*cross_compile:
|
||
0
|
||
|
||
*multilib:
|
||
. ;
|
||
|
||
-----------------------------------------------------------------------
|
||
|
||
The above is currently correct for ix86/Linux. Because of
|
||
compatibility issues on this platform the dynamic linker must have
|
||
a different name: ld-linux.so.2. So you have to replace
|
||
|
||
%{!dynamic-linker:-dynamic-linker=/home/gnu/lib/ld-linux.so.2}
|
||
by
|
||
%{!dynamic-linker:-dynamic-linker=/home/gnu/lib/ld.so.1}
|
||
|
||
in the above example specs file to make it work for other systems.
|
||
|
||
Version 2.7.2.3 does and future versions of GCC will automatically
|
||
provide the correct specs.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q17] ``Looking through the shared libc file I haven't found the
|
||
functions `stat', `lstat', `fstat', and `mknod' and while
|
||
linking on my Linux system I get error messages. How is
|
||
this supposed to work?''
|
||
|
||
[A17] {RM} Believe it or not, stat and lstat (and fstat, and mknod)
|
||
are supposed to be undefined references in libc.so.6! Your problem is
|
||
probably a missing or incorrect /usr/lib/libc.so file; note that this
|
||
is a small text file now, not a symlink to libc.so.6. It should look
|
||
something like this:
|
||
|
||
GROUP ( libc.so.6 ld.so.1 libc.a )
|
||
|
||
or in ix86/Linux and alpha/Linux:
|
||
|
||
GROUP ( libc.so.6 ld-linux.so.2 libc.a )
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q18] ``The prototypes for `connect', `accept', `getsockopt',
|
||
`setsockopt', `getsockname', `getpeername', `send',
|
||
`sendto', and `recvfrom' are different in GNU libc from
|
||
any other system I saw. This is a bug, isn't it?''
|
||
|
||
[A18] {UD} No, this is no bug. This version of the GNU libc already
|
||
follows the Single Unix specifications (and I think the POSIX.1g
|
||
draft which adopted the solution). The type for parameter describing
|
||
a size is now `socklen_t', a new type.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q19] ``My XXX kernel emulates a floating-point coprocessor for me.
|
||
Should I enable --with-fp?''
|
||
|
||
[A19] {UD} As `configure --help' shows the default value is `yes' and
|
||
this should not be changed unless the FPU instructions would be
|
||
invalid. I.e., an emulated FPU is for the libc as good as a real one.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q20] ``How can I compile gcc 2.7.2.1 from the gcc source code using
|
||
glibc 2.x?
|
||
|
||
[A20] {AJ} There's only correct support for glibc 2.0.x in gcc 2.7.2.3
|
||
or later. You should get at least gcc 2.7.2.3. All previous versions
|
||
had problems with glibc support.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q21] ``On Linux I've got problems with the declarations in Linux
|
||
kernel headers.''
|
||
|
||
[A21] {UD,AJ} On Linux, the use of kernel headers is reduced to a very
|
||
minimum. Besides giving Linus the possibility to change the headers
|
||
more freely it has another reason: user level programs now do not
|
||
always use the same types like the kernel does.
|
||
|
||
I.e., the libc abstracts the use of types. E.g., the sigset_t type is
|
||
in the kernel 32 or 64 bits wide. In glibc it is 1024 bits wide, in
|
||
preparation for future development. The reasons are obvious: we don't
|
||
want to have a new major release when the Linux kernel gets these
|
||
functionality. Consult the headers for more information about the changes.
|
||
|
||
Therefore you shouldn't include Linux kernel header files directly if
|
||
glibc has defined a replacement. Otherwise you might get undefined
|
||
results because of type conflicts.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q22] ``When I try to compile code which uses IPv6 header and
|
||
definitions on my Linux 2.x.y system I am in trouble.
|
||
Nothing seems to work.''
|
||
|
||
[A22] {UD} The problem is that the IPv6 development still has not reached
|
||
a point where it is stable. There are still lots of incompatible changes
|
||
made and the libc headers have to follow.
|
||
|
||
Currently (as of 970401) according to Philip Blundell <pjb27@cam.ac.uk>
|
||
the required kernel version is 2.1.30.
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q23] ``When compiling GNU libc I get lots of errors saying functions
|
||
in glibc are duplicated in libgcc.''
|
||
|
||
[A23] {EY} This is *exactly* the same problem that I was having. The
|
||
problem was due to the fact that the autoconfigure didn't correctly
|
||
detect that linker flag --no-whole-archive was supported in my linker.
|
||
In my case it was because I had run ./configure with bogus CFLAGS, and
|
||
the test failed.
|
||
|
||
One thing that is particularly annoying about this problem is that
|
||
once this is misdetected, running configure again won't fix it unless
|
||
you first delete config.cache.
|
||
|
||
{UD} Starting with glibc-2.0.3 there should be a better test to avoid
|
||
some problems of this kind. The setting of CFLAGS is checked at the
|
||
very beginning and if it is not usable `configure' will bark.
|
||
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
[Q24] ``I have set up /etc/nis.conf, and the Linux libc 5 with NYS
|
||
works great. But the glibc NIS+ doesn't seem to work.''
|
||
|
||
[A24] The glibc NIS+ implementation uses a /var/nis/NIS_COLD_START
|
||
file for storing information about the NIS+ server and their public
|
||
keys, because the nis.conf file do not contain all necessary
|
||
information. You have to copy a NIS_COLD_START file from a Solaris
|
||
client (the NIS_COLD_START file is byte order independend) or generate
|
||
it new with nisinit from the nis-tools (look at
|
||
http://www-vt.uni-paderborn.de/~kukuk/linux/nisplus.html).
|
||
|
||
|
||
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
|
||
|
||
Answers were given by:
|
||
{UD} Ulrich Drepper, <drepper@cygnus.com>
|
||
{DMT} David Mosberger-Tang, <davidm@AZStarNet.com>
|
||
{RM} Roland McGrath, <roland@gnu.ai.mit.edu>
|
||
{HJL} H.J. Lu, <hjl@gnu.ai.mit.edu>
|
||
{AJ} Andreas Jaeger, <aj@arthur.rhein-neckar.de>
|
||
{EY} Eric Youngdale, <eric@andante.jic.com>
|
||
|
||
Local Variables:
|
||
mode:text
|
||
End:
|