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This is configure.info, produced by makeinfo version 4.0 from
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./configure.texi.
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INFO-DIR-SECTION GNU admin
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START-INFO-DIR-ENTRY
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* configure: (configure). The GNU configure and build system
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END-INFO-DIR-ENTRY
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This file documents the GNU configure and build system.
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Copyright (C) 1998 Cygnus Solutions.
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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of
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this manual under the conditions for verbatim copying, provided that
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the entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this
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manual into another language, under the above conditions for modified
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versions, except that this permission notice may be stated in a
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translation approved by the Foundation.
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File: configure.info, Node: Multilibs in Target Libraries, Prev: Multilibs in gcc, Up: Multilibs
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Multilibs in Target Libraries
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=============================
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The target libraries in the Cygnus tree are automatically built with
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multilibs. That means that each library is built multiple times.
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This default is set in the top level `configure.in' file, by adding
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`--enable-multilib' to the list of arguments passed to configure when
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it is run for the target libraries (*note Host and Target Libraries::).
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Each target library uses the shell script `config-ml.in', written by
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Doug Evans, to prepare to build target libraries. This shell script is
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invoked after the `Makefile' has been created by the `configure'
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script. If multilibs are not enabled, it does nothing, otherwise it
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modifies the `Makefile' to support multilibs.
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The `config-ml.in' script makes one copy of the `Makefile' for each
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multilib in the appropriate subdirectory. When configuring in the
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source directory (which is not recommended), it will build a symlink
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tree of the sources in each subdirectory.
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The `config-ml.in' script sets several variables in the various
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`Makefile's. The `Makefile.in' must have definitions for these
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variables already; `config-ml.in' simply changes the existing values.
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The `Makefile' should use default values for these variables which will
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do the right thing in the subdirectories.
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`MULTISRCTOP'
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`config-ml.in' will set this to a sequence of `../' strings, where
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the number of strings is the number of multilib levels in the
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source tree. The default value should be the empty string.
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`MULTIBUILDTOP'
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`config-ml.in' will set this to a sequence of `../' strings, where
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the number of strings is number of multilib levels in the object
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directory. The default value should be the empty string. This
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will differ from `MULTISRCTOP' when configuring in the source tree
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(which is not recommended).
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`MULTIDIRS'
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In the top level `Makefile' only, `config-ml.in' will set this to
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the list of multilib subdirectories. The default value should be
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the empty string.
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`MULTISUBDIR'
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`config-ml.in' will set this to the installed subdirectory name to
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use for this subdirectory, with a leading `/'. The default value
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shold be the empty string.
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`MULTIDO'
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`MULTICLEAN'
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In the top level `Makefile' only, `config-ml.in' will set these
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variables to commands to use when doing a recursive make. These
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variables should both default to the string `true', so that by
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default nothing happens.
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All references to the parent of the source directory should use the
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variable `MULTISRCTOP'. Instead of writing `$(srcdir)/..', you must
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write `$(srcdir)/$(MULTISRCTOP)..'.
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Similarly, references to the parent of the object directory should
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use the variable `MULTIBUILDTOP'.
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In the installation target, the libraries should be installed in the
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subdirectory `MULTISUBDIR'. Instead of installing
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`$(libdir)/libfoo.a', install `$(libdir)$(MULTISUBDIR)/libfoo.a'.
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The `config-ml.in' script also modifies the top level `Makefile' to
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add `multi-do' and `multi-clean' targets which are used when building
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multilibs.
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The default target of the `Makefile' should include the following
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command:
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@$(MULTIDO) $(FLAGS_TO_PASS) DO=all multi-do
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This assumes that `$(FLAGS_TO_PASS)' is defined as a set of variables
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to pass to a recursive invocation of `make'. This will build all the
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multilibs. Note that the default value of `MULTIDO' is `true', so by
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default this command will do nothing. It will only do something in the
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top level `Makefile' if multilibs were enabled.
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The `install' target of the `Makefile' should include the following
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command:
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@$(MULTIDO) $(FLAGS_TO_PASS) DO=install multi-do
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In general, any operation, other than clean, which should be
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performed on all the multilibs should use a `$(MULTIDO)' line, setting
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the variable `DO' to the target of each recursive call to `make'.
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The `clean' targets (`clean', `mostlyclean', etc.) should use
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`$(MULTICLEAN)'. For example, the `clean' target should do this:
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@$(MULTICLEAN) DO=clean multi-clean
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File: configure.info, Node: FAQ, Next: Index, Prev: Multilibs, Up: Top
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Frequently Asked Questions
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**************************
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Which do I run first, `autoconf' or `automake'?
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Except when you first add autoconf or automake support to a
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package, you shouldn't run either by hand. Instead, configure
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with the `--enable-maintainer-mode' option, and let `make' take
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care of it.
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`autoconf' says something about undefined macros.
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This means that you have macros in your `configure.in' which are
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not defined by `autoconf'. You may be using an old version of
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`autoconf'; try building and installing a newer one. Make sure the
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newly installled `autoconf' is first on your `PATH'. Also, see
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the next question.
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My `configure' script has stuff like `CY_GNU_GETTEXT' in it.
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This means that you have macros in your `configure.in' which should
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be defined in your `aclocal.m4' file, but aren't. This usually
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means that `aclocal' was not able to appropriate definitions of the
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macros. Make sure that you have installed all the packages you
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need. In particular, make sure that you have installed libtool
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(this is where `AM_PROG_LIBTOOL' is defined) and gettext (this is
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where `CY_GNU_GETTEXT' is defined, at least in the Cygnus version
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of gettext).
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My `Makefile' has `@' characters in it.
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This may mean that you tried to use an autoconf substitution in
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your `Makefile.in' without adding the appropriate `AC_SUBST' call
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to your `configure' script. Or it may just mean that you need to
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rebuild `Makefile' in your build directory. To rebuild `Makefile'
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from `Makefile.in', run the shell script `config.status' with no
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arguments. If you need to force `configure' to run again, first
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run `config.status --recheck'. These runs are normally done
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automatically by `Makefile' targets, but if your `Makefile' has
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gotten messed up you'll need to help them along.
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Why do I have to run both `config.status --recheck' and `config.status'?
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Normally, you don't; they will be run automatically by `Makefile'
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targets. If you do need to run them, use `config.status --recheck'
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to run the `configure' script again with the same arguments as the
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first time you ran it. Use `config.status' (with no arguments) to
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regenerate all files (`Makefile', `config.h', etc.) based on the
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results of the configure script. The two cases are separate
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because it isn't always necessary to regenerate all the files
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after running `config.status --recheck'. The `Makefile' targets
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generated by automake will use the environment variables
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`CONFIG_FILES' and `CONFIG_HEADERS' to only regenerate files as
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they are needed.
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What is the Cygnus tree?
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The Cygnus tree is used for various packages including gdb, the GNU
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binutils, and egcs. It is also, of course, used for Cygnus
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releases. It is the build system which was developed at Cygnus,
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using the Cygnus configure script. It permits building many
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different packages with a single configure and make. The
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configure scripts in the tree are being converted to autoconf, but
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the general build structure remains intact.
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Why do I have to keep rebuilding and reinstalling the tools?
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I know, it's a pain. Unfortunately, there are bugs in the tools
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themselves which need to be fixed, and each time that happens
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everybody who uses the tools need to reinstall new versions of
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them. I don't know if there is going to be a clever fix until the
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tools stabilize.
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Why not just have a Cygnus tree `make' target to update the tools?
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The tools unfortunately need to be installed before they can be
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used. That means that they must be built using an appropriate
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prefix, and it seems unwise to assume that every configuration
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uses an appropriate prefix. It might be possible to make them
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work in place, or it might be possible to install them in some
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subdirectory; so far these approaches have not been implemented.
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File: configure.info, Node: Index, Prev: FAQ, Up: Top
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Index
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*****
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* Menu:
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* --build option: Build and Host Options.
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* --host option: Build and Host Options.
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* --target option: Specifying the Target.
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* _GNU_SOURCE: Write configure.in.
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* AC_CANONICAL_HOST: Using the Host Type.
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* AC_CANONICAL_SYSTEM: Using the Target Type.
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* AC_CONFIG_HEADER: Write configure.in.
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* AC_EXEEXT: Write configure.in.
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* AC_INIT: Write configure.in.
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* AC_OUTPUT: Write configure.in.
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* AC_PREREQ: Write configure.in.
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* AC_PROG_CC: Write configure.in.
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* AC_PROG_CXX: Write configure.in.
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* acconfig.h: Written Developer Files.
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* acconfig.h, writing: Write acconfig.h.
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* acinclude.m4: Written Developer Files.
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* aclocal.m4: Generated Developer Files.
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* AM_CONFIG_HEADER: Write configure.in.
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* AM_DISABLE_SHARED: Write configure.in.
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* AM_EXEEXT: Write configure.in.
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* AM_INIT_AUTOMAKE: Write configure.in.
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* AM_MAINTAINER_MODE: Write configure.in.
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* AM_PROG_LIBTOOL: Write configure.in.
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* AM_PROG_LIBTOOL in configure: FAQ.
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* build option: Build and Host Options.
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* building with a cross compiler: Canadian Cross.
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* canadian cross: Canadian Cross.
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* canadian cross in configure: CCross in Configure.
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* canadian cross in cygnus tree: CCross in Cygnus Tree.
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* canadian cross in makefile: CCross in Make.
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* canadian cross, configuring: Build and Host Options.
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* canonical system names: Configuration Names.
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* config.cache: Build Files Description.
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* config.h: Build Files Description.
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* config.h.in: Generated Developer Files.
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* config.in: Generated Developer Files.
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* config.status: Build Files Description.
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* config.status --recheck: FAQ.
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* configuration names: Configuration Names.
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* configuration triplets: Configuration Names.
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* configure: Generated Developer Files.
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* configure build system: Build and Host Options.
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* configure host: Build and Host Options.
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* configure target: Specifying the Target.
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* configure.in: Written Developer Files.
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* configure.in, writing: Write configure.in.
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* configuring a canadian cross: Build and Host Options.
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* cross compiler: Cross Compilation Concepts.
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* cross compiler, building with: Canadian Cross.
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* cross tools: Cross Compilation Tools.
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* CY_GNU_GETTEXT in configure: FAQ.
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* cygnus configure: Cygnus Configure.
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* goals: Goals.
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* history: History.
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* host names: Configuration Names.
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* host option: Build and Host Options.
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* host system: Host and Target.
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* host triplets: Configuration Names.
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* HOST_CC: CCross in Make.
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* libg++ configure: Cygnus Configure in C++ Libraries.
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* libio configure: Cygnus Configure in C++ Libraries.
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* libstdc++ configure: Cygnus Configure in C++ Libraries.
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* Makefile: Build Files Description.
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* Makefile, garbage characters: FAQ.
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* Makefile.am: Written Developer Files.
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* Makefile.am, writing: Write Makefile.am.
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* Makefile.in: Generated Developer Files.
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* multilibs: Multilibs.
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* stamp-h: Build Files Description.
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* stamp-h.in: Generated Developer Files.
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* system names: Configuration Names.
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* system types: Configuration Names.
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* target option: Specifying the Target.
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* target system: Host and Target.
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* triplets: Configuration Names.
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* undefined macros: FAQ.
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