Fri May 10 18:36:14 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* FAQ: New file contributed by drepper. * time/Makefile (headers): Add timebits.h. * sysdeps/unix/sysv/linux/timebits.h: New file. * sysdeps/stub/timebits.h: New file. * time/time.h (CLK_TCK): Define to CLOCKS_PER_SEC. (CLOCKS_PER_SEC): Remove this macro. Instead #include <timebits.h>.
This commit is contained in:
Roland McGrath
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14
ChangeLog
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ChangeLog
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@ -1,3 +1,13 @@
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Fri May 10 18:36:14 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
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* FAQ: New file contributed by drepper.
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* time/Makefile (headers): Add timebits.h.
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* sysdeps/unix/sysv/linux/timebits.h: New file.
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* sysdeps/stub/timebits.h: New file.
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* time/time.h (CLK_TCK): Define to CLOCKS_PER_SEC.
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(CLOCKS_PER_SEC): Remove this macro. Instead #include <timebits.h>.
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Fri May 10 16:22:44 1996 Michael I. Bushnell, p/BSG <mib@gnu.ai.mit.edu>
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* string/argz-create.c (__argz_create): Restore const keyword to
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@ -5,7 +15,7 @@ Fri May 10 16:22:44 1996 Michael I. Bushnell, p/BSG <mib@gnu.ai.mit.edu>
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* string/argz.h (__argz_create, argz_create): Restore const
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keyword.
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* string/envz.c (envz_get): Don't declare ENTRY const.
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Fri May 10 11:48:03 1996 Miles Bader <miles@gnu.ai.mit.edu>
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* string/argz.h (argz_create): Fix param type.
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@ -18,7 +28,7 @@ Fri May 10 09:41:54 1996 Michael I. Bushnell, p/BSG <mib@gnu.ai.mit.edu>
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from declaration of ARGV.
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* string/envz.h (envz_get): Omit const from declaration of return
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type.
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Thu May 9 09:17:46 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
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* aclocal.m4 (AC_FD_MSG, AC_FD_CC): Fix these for autoconf weirdness.
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@ -0,0 +1,140 @@
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Frequently Asked Question on GNU C Library
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As every FAQ this one also tries to answer the questions the user
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might when using the pacakge. Please make sure you read this before
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sending questions/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 question which you think might be worth answered in
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this document let me know.
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--drepper@cygnus.com
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q1] ``What systems the GNU C Library runs 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 Linux-2.0 on Intel
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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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Roland McGrath <roland@gnu.ai.mit.edu>
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or Ulrich Drepper <drepper@cygnus.com>
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q2] ``What compiler do I need to translate 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 mirrors.
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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.
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q3] ``When starting make I get only errors messages.
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What's wrong?''
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[A3] {UD} You definitely need GNU make to translate GNU libc. No
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other make program has the needed functionality.
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Versions before 3.74 have bugs which prevent correct execution so you
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should upgrade to the latest version before starting the compilation.
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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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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[A4] {UD} You have to get the specified autoconf version (or a later)
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from your favourite mirror of prep.ai.mit.edu.
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q5] ``Do I need a special linker or archiver?''
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[A5] {UD} If your native versions are not too buggy you can work with
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them. But GNU libc works best with GNU binutils.
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On systems where the native linker does not support weak symbols you
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will not get a really ISO C compliant C library. Generally speaking
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you should use the GNU binutils if they provide at least the same
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functionality as your system's tools.
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q6] ``Do I need some more things to compile GNU C Library?''
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[A6] {UD} Yes, there are some more :-).
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* lots of diskspace (for i386-linux this means, e.g., ~70MB)
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You should avoid compiling on a NFS mounted device. This is very
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slow.
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* plenty of time (approx 1h for i386-linux on i586@133 or 2.5h or
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i486@66).
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If you have some more interested measurements let me know.
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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[Q7] ``When I run `nm libc.so|grep " U "' on the produced library
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I still find unresolved symbols? Can this be ok?''
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[A7] {UD} Yes, this is ok. There can be several kinds of unresolved
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symbols:
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* magic symbols automatically generated by the linker. Names are
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often like __start_* and __stop_*-
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* symbols resolved by using libgcc.a
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(__udivdi3, __umoddi3, or similar)
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* weak symbols, which need not be resolved at all
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(currently fabs among others; this gets resolved if the program
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is linked against libm, too.)
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Generally, you should make sure you find a real program which produces
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errors while linking.
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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Answers were given by:
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{UD} Ulrich Drepper, <drepper@cygnus.com>
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Local Variables:
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mode:text
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End:
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@ -0,0 +1,25 @@
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/* System-dependent timing definitions. Stub version.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _TIMEBITS_H
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#define _TIMEBITS_H 1
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#define CLOCKS_PER_SEC 60
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#endif /* timebits.h */
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@ -0,0 +1,26 @@
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/* System-dependent timing definitions. Linux version.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _TIMEBITS_H
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#define _TIMEBITS_H 1
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#include <asm/param.h>
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#define CLOCKS_PER_SEC HZ /* XXX names not kosher */
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#endif /* timebits.h */
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@ -21,7 +21,7 @@
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#
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subdir := time
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headers := time.h sys/time.h sys/timeb.h
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headers := time.h sys/time.h sys/timeb.h timebits.h
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distribute := tzfile.h private.h scheck.c ialloc.c yearistype
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extra-objs = scheck.o ialloc.o zonenames $(tzfiles:%=z.%)
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@ -40,11 +40,14 @@ __BEGIN_DECLS
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#ifdef _TIME_H
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/* Processor clock ticks per second. */
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#define CLOCKS_PER_SEC 1 /* ??? */
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/* This defines CLOCKS_PER_SEC, which is the number of processor clock
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ticks per second. */
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#include <timebits.h>
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/* This is the obsolete POSIX.1-1988 name for the same constant. */
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#ifdef __USE_POSIX
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#define CLK_TCK 60 /* ??? */
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#define CLK_TCK CLOCKS_PER_SEC
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#endif
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#endif /* <time.h> included. */
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