make-stds.texi

autoconf是一个产生可以自动配置源代码包

@item exec_prefix
@vindex exec_prefix
A prefix used in constructing the default values of some of the
variables listed below.  The default value of @code{exec_prefix} should
be @code{$(prefix)}.
(If you are using Autoconf, write it as @samp{@@exec_prefix@@}.)

Generally, @code{$(exec_prefix)} is used for directories that contain
machine-specific files (such as executables and subroutine libraries),
while @code{$(prefix)} is used directly for other directories.

Running @samp{make install} with a different value of @code{exec_prefix}
from the one used to build the program should @emph{not} recompile the
program.
@end table

Executable programs are installed in one of the following directories.

@table @code
@item bindir
@vindex bindir
The directory for installing executable programs that users can run.
This should normally be @file{/usr/local/bin}, but write it as
@file{$(exec_prefix)/bin}.
(If you are using Autoconf, write it as @samp{@@bindir@@}.)

@item sbindir
@vindex sbindir
The directory for installing executable programs that can be run from
the shell, but are only generally useful to system administrators.  This
should normally be @file{/usr/local/sbin}, but write it as
@file{$(exec_prefix)/sbin}.
(If you are using Autoconf, write it as @samp{@@sbindir@@}.)

@item libexecdir
@vindex libexecdir
@comment This paragraph adjusted to avoid overfull hbox --roland 5jul94
The directory for installing executable programs to be run by other
programs rather than by users.  This directory should normally be
@file{/usr/local/libexec}, but write it as @file{$(exec_prefix)/libexec}.
(If you are using Autoconf, write it as @samp{@@libexecdir@@}.)

The definition of @samp{libexecdir} is the same for all packages, so
you should install your data in a subdirectory thereof.  Most packages
install their data under @file{$(libexecdir)/@var{package-name}/},
possibly within additional subdirectories thereof, such as
@file{$(libexecdir)/@var{package-name}/@var{machine}/@var{version}}.
@end table

Data files used by the program during its execution are divided into
categories in two ways.

@itemize @bullet
@item
Some files are normally modified by programs; others are never normally
modified (though users may edit some of these).

@item
Some files are architecture-independent and can be shared by all
machines at a site; some are architecture-dependent and can be shared
only by machines of the same kind and operating system; others may never
be shared between two machines.
@end itemize

This makes for six different possibilities.  However, we want to
discourage the use of architecture-dependent files, aside from object
files and libraries.  It is much cleaner to make other data files
architecture-independent, and it is generally not hard.

Here are the variables Makefiles should use to specify directories
to put these various kinds of files in:

@table @samp
@item datarootdir
The root of the directory tree for read-only architecture-independent
data files.  This should normally be @file{/usr/local/share}, but
write it as @file{$(prefix)/share}.  (If you are using Autoconf, write
it as @samp{@@datarootdir@@}.)  @samp{datadir}'s default value is
based on this variable; so are @samp{infodir}, @samp{mandir}, and
others.

@item datadir
The directory for installing idiosyncratic read-only
architecture-independent data files for this program.  This is usually
the same place as @samp{datarootdir}, but we use the two separate
variables so that you can move these program-specific files without
altering the location for Info files, man pages, etc.

This should normally be @file{/usr/local/share}, but write it as
@file{$(datarootdir)}.  (If you are using Autoconf, write it as
@samp{@@datadir@@}.)

The definition of @samp{datadir} is the same for all packages, so you
should install your data in a subdirectory thereof.  Most packages
install their data under @file{$(datadir)/@var{package-name}/}.

@item sysconfdir
The directory for installing read-only data files that pertain to a
single machine--that is to say, files for configuring a host.  Mailer
and network configuration files, @file{/etc/passwd}, and so forth belong
here.  All the files in this directory should be ordinary ASCII text
files.  This directory should normally be @file{/usr/local/etc}, but
write it as @file{$(prefix)/etc}.
(If you are using Autoconf, write it as @samp{@@sysconfdir@@}.)

Do not install executables here in this directory (they probably belong
in @file{$(libexecdir)} or @file{$(sbindir)}).  Also do not install
files that are modified in the normal course of their use (programs
whose purpose is to change the configuration of the system excluded).
Those probably belong in @file{$(localstatedir)}.

@item sharedstatedir
The directory for installing architecture-independent data files which
the programs modify while they run.  This should normally be
@file{/usr/local/com}, but write it as @file{$(prefix)/com}.
(If you are using Autoconf, write it as @samp{@@sharedstatedir@@}.)

@item localstatedir
The directory for installing data files which the programs modify while
they run, and that pertain to one specific machine.  Users should never
need to modify files in this directory to configure the package's
operation; put such configuration information in separate files that go
in @file{$(datadir)} or @file{$(sysconfdir)}.  @file{$(localstatedir)}
should normally be @file{/usr/local/var}, but write it as
@file{$(prefix)/var}.
(If you are using Autoconf, write it as @samp{@@localstatedir@@}.)
@end table

These variables specify the directory for installing certain specific
types of files, if your program has them.  Every GNU package should
have Info files, so every program needs @samp{infodir}, but not all
need @samp{libdir} or @samp{lispdir}.

@table @samp
@item includedir
@c rewritten to avoid overfull hbox --roland
The directory for installing header files to be included by user
programs with the C @samp{#include} preprocessor directive.  This
should normally be @file{/usr/local/include}, but write it as
@file{$(prefix)/include}.
(If you are using Autoconf, write it as @samp{@@includedir@@}.)

Most compilers other than GCC do not look for header files in directory
@file{/usr/local/include}.  So installing the header files this way is
only useful with GCC.  Sometimes this is not a problem because some
libraries are only really intended to work with GCC.  But some libraries
are intended to work with other compilers.  They should install their
header files in two places, one specified by @code{includedir} and one
specified by @code{oldincludedir}.

@item oldincludedir
The directory for installing @samp{#include} header files for use with
compilers other than GCC.  This should normally be @file{/usr/include}.
(If you are using Autoconf, you can write it as @samp{@@oldincludedir@@}.)

The Makefile commands should check whether the value of
@code{oldincludedir} is empty.  If it is, they should not try to use
it; they should cancel the second installation of the header files.

A package should not replace an existing header in this directory unless
the header came from the same package.  Thus, if your Foo package
provides a header file @file{foo.h}, then it should install the header
file in the @code{oldincludedir} directory if either (1) there is no
@file{foo.h} there or (2) the @file{foo.h} that exists came from the Foo
package.

To tell whether @file{foo.h} came from the Foo package, put a magic
string in the file---part of a comment---and @code{grep} for that string.

@item docdir
The directory for installing documentation files (other than Info) for
this package.  By default, it should be
@file{/usr/local/share/doc/@var{yourpkg}}, but it should be written as
@file{$(datarootdir)/doc/@var{yourpkg}}.  (If you are using Autoconf,
write it as @samp{@@docdir@@}.)  The @var{yourpkg} subdirectory, which
may include a version number, prevents collisions among files with
common names, such as @file{README}.

@item infodir
The directory for installing the Info files for this package.  By
default, it should be @file{/usr/local/share/info}, but it should be
written as @file{$(datarootdir)/info}.  (If you are using Autoconf,
write it as @samp{@@infodir@@}.)  @code{infodir} is separate from
@code{docdir} for compatibility with existing practice.

@item htmldir
@itemx dvidir
@itemx pdfdir
@itemx psdir
Directories for installing documentation files in the particular
format.  (It is not required to support documentation in all these
formats.)  They should all be set to @code{$(docdir)} by default.  (If
you are using Autoconf, write them as @samp{@@htmldir@@},
@samp{@@dvidir@@}, etc.)  Packages which supply several translations
of their documentation should install them in
@samp{$(htmldir)/}@var{ll}, @samp{$(pdfdir)/}@var{ll}, etc. where
@var{ll} is a locale abbreviation such as @samp{en} or @samp{pt_BR}.

@item libdir
The directory for object files and libraries of object code.  Do not
install executables here, they probably ought to go in @file{$(libexecdir)}
instead.  The value of @code{libdir} should normally be
@file{/usr/local/lib}, but write it as @file{$(exec_prefix)/lib}.
(If you are using Autoconf, write it as @samp{@@libdir@@}.)

@item lispdir
The directory for installing any Emacs Lisp files in this package.  By
default, it should be @file{/usr/local/share/emacs/site-lisp}, but it
should be written as @file{$(datarootdir)/emacs/site-lisp}.

If you are using Autoconf, write the default as @samp{@@lispdir@@}.
In order to make @samp{@@lispdir@@} work, you need the following lines
in your @file{configure.in} file:

@example
lispdir='$@{datarootdir@}/emacs/site-lisp'
AC_SUBST(lispdir)
@end example

@item localedir
The directory for installing locale-specific message catalogs for this
package.  By default, it should be @file{/usr/local/share/locale}, but
it should be written as @file{$(datarootdir)/locale}.  (If you are
using Autoconf, write it as @samp{@@localedir@@}.)  This directory
usually has a subdirectory per locale.
@end table

Unix-style man pages are installed in one of the following:

@table @samp
@item mandir
The top-level directory for installing the man pages (if any) for this
package.  It will normally be @file{/usr/local/share/man}, but you
should write it as @file{$(datarootdir)/man}.  (If you are using
Autoconf, write it as @samp{@@mandir@@}.)

@item man1dir
The directory for installing section 1 man pages.  Write it as
@file{$(mandir)/man1}.
@item man2dir
The directory for installing section 2 man pages.  Write it as
@file{$(mandir)/man2}
@item @dots{}

@strong{Don't make the primary documentation for any GNU software be a
man page.  Write a manual in Texinfo instead.  Man pages are just for
the sake of people running GNU software on Unix, which is a secondary
application only.}

@item manext
The file name extension for the installed man page.  This should contain
a period followed by the appropriate digit; it should normally be @samp{.1}.

@item man1ext
The file name extension for installed section 1 man pages.
@item man2ext
The file name extension for installed section 2 man pages.
@item @dots{}
Use these names instead of @samp{manext} if the package needs to install man
pages in more than one section of the manual.
@end table

And finally, you should set the following variable:

@table @samp
@item srcdir
The directory for the sources being compiled.  The value of this
variable is normally inserted by the @code{configure} shell script.
(If you are using Autconf, use @samp{srcdir = @@srcdir@@}.)
@end table

For example:

@smallexample
@c I have changed some of the comments here slightly to fix an overfull
@c hbox, so the make manual can format correctly. --roland
# Common prefix for installation directories.
# NOTE: This directory must exist when you start the install.
prefix = /usr/local
datarootdir = $(prefix)/share
datadir = $(datarootdir)
exec_prefix = $(prefix)
# Where to put the executable for the command `gcc'.
bindir = $(exec_prefix)/bin
# Where to put the directories used by the compiler.
libexecdir = $(exec_prefix)/libexec
# Where to put the Info files.
infodir = $(datarootdir)/info
@end smallexample

If your program installs a large number of files into one of the
standard user-specified directories, it might be useful to group them
into a subdirectory particular to that program.  If you do this, you
should write the @code{install} rule to create these subdirectories.

Do not expect the user to include the subdirectory name in the value of
any of the variables listed above.  The idea of having a uniform set of
variable names for installation directories is to enable the user to
specify the exact same values for several different GNU packages.  In
order for this to be useful, all the packages must be designed so that
they will work sensibly when the user does so.

Not all of these variables may be implemented in the current release
of Autoconf and/or Automake; right now, that includes at least
@code{docdir}, @code{psdir}, @code{pdfdir}, @code{htmldir},
@code{dvidir}.  In these cases, the descriptions here serve as
specifications for what Autoconf will implement.  As a programmer, you
can either use a development version of Autoconf or avoid using these
variables until a stable release is made which supports them.


@node Standard Targets
@section Standard Targets for Users

All GNU programs should have the following targets in their Makefiles:

@table @samp
@item all
Compile the entire program.  This should be the default target.  This
target need not rebuild any documentation files; Info files should
normally be included in the distribution, and DVI files should be made
only when explicitly asked for.

By default, the Make rules should compile and link with @samp{-g}, so
that executable programs have debugging symbols.  Users who don't mind
being helpless can strip the executables later if they wish.

@item install
Compile the program and copy the executables, libraries, and so on to
the file names where they should reside for actual use.  If there is a
simple test to verify that a program is properly installed, this target
should run that test.

Do not strip executables when installing them.  Devil-may-care users can
use the @code{install-strip} target to do that.

If possible, write the @code{install} target rule so that it does not
modify anything in the directory where the program was built, provided
@samp{make all} has just been done.  This is convenient for building the
program under one user name and installing it under another.

The commands should create all the directories in which files are to be
installed, if they don't already exist.  This includes the directories
specified as the values of the variables @code{prefix} and
@code{exec_prefix}, as well as all subdirectories that are needed.
One way to do this is by means of an @code{installdirs} target
as described below.

Use @samp{-} before any command for installing a man page, so that
@code{make} will ignore any errors.  This is in case there are systems
that don't have the Unix man page documentation system installed.

The way to install Info files is to copy them into @file{$(infodir)}
with @code{$(INSTALL_DATA)} (@pxref{Command Variables}), and then run
the @code{install-info} program if it is present.  @code{install-info}
is a program that edits the Info @file{dir} file to add or update the
menu entry for the given Info file; it is part of the Texinfo package.
Here is a sample rule to install an Info file:

@comment This example has been carefully formatted for the Make manual.
@comment Please do not reformat it without talking to [e-mail].
@smallexample
$(DESTDIR)$(infodir)/foo.info: foo.info
        $(POST_INSTALL)
# There may be a newer info file in . than in srcdir.
        -if test -f foo.info; then d=.; \
         else d=$(srcdir); fi; \
        $(INSTALL_DATA) $$d/foo.info $(DESTDIR)$@@; \
# Run install-info only if it exists.
# Use `if' instead of just prepending `-' to the
# line so we notice real errors from install-info.
# We use `$(SHELL) -c' because some shells do not
# fail gracefully when there is an unknown command.
        if $(SHELL) -c 'install-info --version' \
           >/dev/null 2>&1; then \
          install-info --dir-file=$(DESTDIR)$(infodir)/dir \