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linux/Documentation/process/changes.rst
Masahiro Yamada 033dba2ec0 kbuild: prepare to remove C files pre-generated by flex and bison 
In Linux build system convention, pre-generated files are version-
controlled with a "_shipped" suffix.  During the kernel building,
they are simply shipped (copied) removing the suffix.

This approach can reduce external tool dependency for the kernel build,
but it is tedious to manually regenerate such artifacts from developers'
point of view.  (We need to do "make REGENERATE_PARSERS=1" every time
we touch real source files such as *.l, *.y)

Some months ago, I sent out RFC patches to run flex, bison, and gperf
during the build.

In the review and test, Linus noticed gperf-3.1 had changed the lookup
function prototype.  Then, the use of gperf in kernel was entirely
removed by commit bb3290d916 ("Remove gperf usage from toolchain").

This time, I tested several versions of flex and bison, and I was not
hit by any compatibility issue except a flaw in flex-2.6.3; if you
generate lexer for dtc and genksyms with flex-2.6.3, you will see
"yywrap redefined" warning.  This was not intentional, but a bug,
fixed by flex-2.6.4.  Otherwise, both flex and bison look fairly
stable for a long time.

This commit prepares some build rules to remove the _shipped files.
Also, document minimal requirement for flex and bison.

Rationale for the minimal version:
The -Wmissing-prototypes option of GCC warns "no previous prototype"
for lexers generated by flex-2.5.34 or older, so I chose 2.5.35 as the
required version for flex.  Flex-2.5.35 was released in 2008.  Bison
looks more stable.  I did not see any problem with bison-2.0, released
in 2004.  I did not test bison-1.x, but bison-2.0 should be old enough.

Tested flex versions:
  2.5.35
  2.5.36
  2.5.37
  2.5.39
  2.6.0
  2.6.1
  2.6.2
  2.6.3   (*)
  2.6.4

 (*) flex-2.6.3 causes "yywrap redefined" warning

Tested bison versions:
  2.0
  2.1
  2.2
  2.3
  2.4
  2.4.1
  2.5.1
  2.6
  2.6.1
  2.6.2
  2.6.3
  2.6.4
  2.6.5
  2.7
  2.7.1
  3.0
  3.0.1
  3.0.2
  3.0.3
  3.0.4

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-12-16 11:12:53 +09:00

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.. _changes:
Minimal requirements to compile the Kernel
++++++++++++++++++++++++++++++++++++++++++
Intro
=====
This document is designed to provide a list of the minimum levels of
software necessary to run the 4.x kernels.
This document is originally based on my "Changes" file for 2.0.x kernels
and therefore owes credit to the same people as that file (Jared Mauch,
Axel Boldt, Alessandro Sigala, and countless other users all over the
'net).
Current Minimal Requirements
****************************
Upgrade to at **least** these software revisions before thinking you've
encountered a bug! If you're unsure what version you're currently
running, the suggested command should tell you.
Again, keep in mind that this list assumes you are already functionally
running a Linux kernel. Also, not all tools are necessary on all
systems; obviously, if you don't have any ISDN hardware, for example,
you probably needn't concern yourself with isdn4k-utils.
====================== =============== ========================================
Program Minimal version Command to check the version
====================== =============== ========================================
GNU C 3.2 gcc --version
GNU make 3.81 make --version
binutils 2.20 ld -v
flex 2.5.35 flex --version
bison 2.0 bison --version
util-linux 2.10o fdformat --version
module-init-tools 0.9.10 depmod -V
e2fsprogs 1.41.4 e2fsck -V
jfsutils 1.1.3 fsck.jfs -V
reiserfsprogs 3.6.3 reiserfsck -V
xfsprogs 2.6.0 xfs_db -V
squashfs-tools 4.0 mksquashfs -version
btrfs-progs 0.18 btrfsck
pcmciautils 004 pccardctl -V
quota-tools 3.09 quota -V
PPP 2.4.0 pppd --version
isdn4k-utils 3.1pre1 isdnctrl 2>&1|grep version
nfs-utils 1.0.5 showmount --version
procps 3.2.0 ps --version
oprofile 0.9 oprofiled --version
udev 081 udevd --version
grub 0.93 grub --version || grub-install --version
mcelog 0.6 mcelog --version
iptables 1.4.2 iptables -V
openssl & libcrypto 1.0.0 openssl version
bc 1.06.95 bc --version
Sphinx\ [#f1]_ 1.3 sphinx-build --version
====================== =============== ========================================
.. [#f1] Sphinx is needed only to build the Kernel documentation
Kernel compilation
******************
GCC
---
The gcc version requirements may vary depending on the type of CPU in your
computer.
Make
----
You will need GNU make 3.81 or later to build the kernel.
Binutils
--------
The build system has, as of 4.13, switched to using thin archives (`ar T`)
rather than incremental linking (`ld -r`) for built-in.o intermediate steps.
This requires binutils 2.20 or newer.
Flex
----
Since Linux 4.16, the build system generates lexical analyzers
during build. This requires flex 2.5.35 or later.
Bison
-----
Since Linux 4.16, the build system generates parsers
during build. This requires bison 2.0 or later.
Perl
----
You will need perl 5 and the following modules: ``Getopt::Long``,
``Getopt::Std``, ``File::Basename``, and ``File::Find`` to build the kernel.
BC
--
You will need bc to build kernels 3.10 and higher
OpenSSL
-------
Module signing and external certificate handling use the OpenSSL program and
crypto library to do key creation and signature generation.
You will need openssl to build kernels 3.7 and higher if module signing is
enabled. You will also need openssl development packages to build kernels 4.3
and higher.
System utilities
****************
Architectural changes
---------------------
DevFS has been obsoleted in favour of udev
(http://www.kernel.org/pub/linux/utils/kernel/hotplug/)
32-bit UID support is now in place. Have fun!
Linux documentation for functions is transitioning to inline
documentation via specially-formatted comments near their
definitions in the source. These comments can be combined with ReST
files the Documentation/ directory to make enriched documentation, which can
then be converted to PostScript, HTML, LaTex, ePUB and PDF files.
In order to convert from ReST format to a format of your choice, you'll need
Sphinx.
Util-linux
----------
New versions of util-linux provide ``fdisk`` support for larger disks,
support new options to mount, recognize more supported partition
types, have a fdformat which works with 2.4 kernels, and similar goodies.
You'll probably want to upgrade.
Ksymoops
--------
If the unthinkable happens and your kernel oopses, you may need the
ksymoops tool to decode it, but in most cases you don't.
It is generally preferred to build the kernel with ``CONFIG_KALLSYMS`` so
that it produces readable dumps that can be used as-is (this also
produces better output than ksymoops). If for some reason your kernel
is not build with ``CONFIG_KALLSYMS`` and you have no way to rebuild and
reproduce the Oops with that option, then you can still decode that Oops
with ksymoops.
Module-Init-Tools
-----------------
A new module loader is now in the kernel that requires ``module-init-tools``
to use. It is backward compatible with the 2.4.x series kernels.
Mkinitrd
--------
These changes to the ``/lib/modules`` file tree layout also require that
mkinitrd be upgraded.
E2fsprogs
---------
The latest version of ``e2fsprogs`` fixes several bugs in fsck and
debugfs. Obviously, it's a good idea to upgrade.
JFSutils
--------
The ``jfsutils`` package contains the utilities for the file system.
The following utilities are available:
- ``fsck.jfs`` - initiate replay of the transaction log, and check
and repair a JFS formatted partition.
- ``mkfs.jfs`` - create a JFS formatted partition.
- other file system utilities are also available in this package.
Reiserfsprogs
-------------
The reiserfsprogs package should be used for reiserfs-3.6.x
(Linux kernels 2.4.x). It is a combined package and contains working
versions of ``mkreiserfs``, ``resize_reiserfs``, ``debugreiserfs`` and
``reiserfsck``. These utils work on both i386 and alpha platforms.
Xfsprogs
--------
The latest version of ``xfsprogs`` contains ``mkfs.xfs``, ``xfs_db``, and the
``xfs_repair`` utilities, among others, for the XFS filesystem. It is
architecture independent and any version from 2.0.0 onward should
work correctly with this version of the XFS kernel code (2.6.0 or
later is recommended, due to some significant improvements).
PCMCIAutils
-----------
PCMCIAutils replaces ``pcmcia-cs``. It properly sets up
PCMCIA sockets at system startup and loads the appropriate modules
for 16-bit PCMCIA devices if the kernel is modularized and the hotplug
subsystem is used.
Quota-tools
-----------
Support for 32 bit uid's and gid's is required if you want to use
the newer version 2 quota format. Quota-tools version 3.07 and
newer has this support. Use the recommended version or newer
from the table above.
Intel IA32 microcode
--------------------
A driver has been added to allow updating of Intel IA32 microcode,
accessible as a normal (misc) character device. If you are not using
udev you may need to::
mkdir /dev/cpu
mknod /dev/cpu/microcode c 10 184
chmod 0644 /dev/cpu/microcode
as root before you can use this. You'll probably also want to
get the user-space microcode_ctl utility to use with this.
udev
----
``udev`` is a userspace application for populating ``/dev`` dynamically with
only entries for devices actually present. ``udev`` replaces the basic
functionality of devfs, while allowing persistent device naming for
devices.
FUSE
----
Needs libfuse 2.4.0 or later. Absolute minimum is 2.3.0 but mount
options ``direct_io`` and ``kernel_cache`` won't work.
Networking
**********
General changes
---------------
If you have advanced network configuration needs, you should probably
consider using the network tools from ip-route2.
Packet Filter / NAT
-------------------
The packet filtering and NAT code uses the same tools like the previous 2.4.x
kernel series (iptables). It still includes backwards-compatibility modules
for 2.2.x-style ipchains and 2.0.x-style ipfwadm.
PPP
---
The PPP driver has been restructured to support multilink and to
enable it to operate over diverse media layers. If you use PPP,
upgrade pppd to at least 2.4.0.
If you are not using udev, you must have the device file /dev/ppp
which can be made by::
mknod /dev/ppp c 108 0
as root.
Isdn4k-utils
------------
Due to changes in the length of the phone number field, isdn4k-utils
needs to be recompiled or (preferably) upgraded.
NFS-utils
---------
In ancient (2.4 and earlier) kernels, the nfs server needed to know
about any client that expected to be able to access files via NFS. This
information would be given to the kernel by ``mountd`` when the client
mounted the filesystem, or by ``exportfs`` at system startup. exportfs
would take information about active clients from ``/var/lib/nfs/rmtab``.
This approach is quite fragile as it depends on rmtab being correct
which is not always easy, particularly when trying to implement
fail-over. Even when the system is working well, ``rmtab`` suffers from
getting lots of old entries that never get removed.
With modern kernels we have the option of having the kernel tell mountd
when it gets a request from an unknown host, and mountd can give
appropriate export information to the kernel. This removes the
dependency on ``rmtab`` and means that the kernel only needs to know about
currently active clients.
To enable this new functionality, you need to::
mount -t nfsd nfsd /proc/fs/nfsd
before running exportfs or mountd. It is recommended that all NFS
services be protected from the internet-at-large by a firewall where
that is possible.
mcelog
------
On x86 kernels the mcelog utility is needed to process and log machine check
events when ``CONFIG_X86_MCE`` is enabled. Machine check events are errors
reported by the CPU. Processing them is strongly encouraged.
Kernel documentation
********************
Sphinx
------
Please see :ref:`sphinx_install` in ``Documentation/doc-guide/sphinx.rst``
for details about Sphinx requirements.
Getting updated software
========================
Kernel compilation
******************
gcc
---
- <ftp://ftp.gnu.org/gnu/gcc/>
Make
----
- <ftp://ftp.gnu.org/gnu/make/>
Binutils
--------
- <https://www.kernel.org/pub/linux/devel/binutils/>
Flex
----
- <https://github.com/westes/flex/releases>
Bison
-----
- <ftp://ftp.gnu.org/gnu/bison/>
OpenSSL
-------
- <https://www.openssl.org/>
System utilities
****************
Util-linux
----------
- <https://www.kernel.org/pub/linux/utils/util-linux/>
Ksymoops
--------
- <https://www.kernel.org/pub/linux/utils/kernel/ksymoops/v2.4/>
Module-Init-Tools
-----------------
- <https://www.kernel.org/pub/linux/utils/kernel/module-init-tools/>
Mkinitrd
--------
- <https://code.launchpad.net/initrd-tools/main>
E2fsprogs
---------
- <http://prdownloads.sourceforge.net/e2fsprogs/e2fsprogs-1.29.tar.gz>
JFSutils
--------
- <http://jfs.sourceforge.net/>
Reiserfsprogs
-------------
- <http://www.kernel.org/pub/linux/utils/fs/reiserfs/>
Xfsprogs
--------
- <ftp://oss.sgi.com/projects/xfs/>
Pcmciautils
-----------
- <https://www.kernel.org/pub/linux/utils/kernel/pcmcia/>
Quota-tools
-----------
- <http://sourceforge.net/projects/linuxquota/>
Intel P6 microcode
------------------
- <https://downloadcenter.intel.com/>
udev
----
- <http://www.freedesktop.org/software/systemd/man/udev.html>
FUSE
----
- <http://sourceforge.net/projects/fuse>
mcelog
------
- <http://www.mcelog.org/>
Networking
**********
PPP
---
- <ftp://ftp.samba.org/pub/ppp/>
Isdn4k-utils
------------
- <ftp://ftp.isdn4linux.de/pub/isdn4linux/utils/>
NFS-utils
---------
- <http://sourceforge.net/project/showfiles.php?group_id=14>
Iptables
--------
- <http://www.iptables.org/downloads.html>
Ip-route2
---------
- <https://www.kernel.org/pub/linux/utils/net/iproute2/>
OProfile
--------
- <http://oprofile.sf.net/download/>
NFS-Utils
---------
- <http://nfs.sourceforge.net/>
Kernel documentation
********************
Sphinx
------
- <http://www.sphinx-doc.org/>
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