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@c Copyright (C) 2001, 2002, 2003, 2004, 2006, 2008, 2010

@c Free Software Foundation, Inc.

@c This is part of the GCC manual.

@c For copying conditions, see the file gcc.texi.

@node Makefile

@subsection Makefile Targets

@cindex makefile targets

@cindex targets, makefile

These targets are available from the @samp{gcc} directory:

@table @code

@item all

This is the default target.  Depending on what your build/host/target

configuration is, it coordinates all the things that need to be built.

@item doc

Produce info-formatted documentation and man pages.  Essentially it

calls @samp{make man} and @samp{make info}.

@item dvi

Produce DVI-formatted documentation.

@item pdf

Produce PDF-formatted documentation.

@item html

Produce HTML-formatted documentation.

@item man

Generate man pages.

@item info

Generate info-formatted pages.

@item mostlyclean

Delete the files made while building the compiler.

@item clean

That, and all the other files built by @samp{make all}.

@item distclean

That, and all the files created by @command{configure}.

@item maintainer-clean

Distclean plus any file that can be generated from other files.  Note

that additional tools may be required beyond what is normally needed to

build GCC.

@item srcextra

Generates files in the source directory that are not version-controlled but

should go into a release tarball.

@item srcinfo

@itemx srcman

Copies the info-formatted and manpage documentation into the source

directory usually for the purpose of generating a release tarball.

@item install

Installs GCC.

@item uninstall

Deletes installed files, though this is not supported.

@item check

Run the testsuite.  This creates a @file{testsuite} subdirectory that

has various @file{.sum} and @file{.log} files containing the results of

the testing.  You can run subsets with, for example, @samp{make check-gcc}.

You can specify specific tests by setting @env{RUNTESTFLAGS} to be the name

of the @file{.exp} file, optionally followed by (for some tests) an equals

and a file wildcard, like:

@smallexample

make check-gcc RUNTESTFLAGS="execute.exp=19980413-*"

@end smallexample

Note that running the testsuite may require additional tools be

installed, such as Tcl or DejaGnu.

@end table

The toplevel tree from which you start GCC compilation is not

the GCC directory, but rather a complex Makefile that coordinates

the various steps of the build, including bootstrapping the compiler

and using the new compiler to build target libraries.

When GCC is configured for a native configuration, the default action

for @command{make} is to do a full three-stage bootstrap.  This means

that GCC is built three times---once with the native compiler, once with

the native-built compiler it just built, and once with the compiler it

built the second time.  In theory, the last two should produce the same

results, which @samp{make compare} can check.  Each stage is configured

separately and compiled into a separate directory, to minimize problems

due to ABI incompatibilities between the native compiler and GCC.

If you do a change, rebuilding will also start from the first stage

and ``bubble'' up the change through the three stages.  Each stage

is taken from its build directory (if it had been built previously),

rebuilt, and copied to its subdirectory.  This will allow you to, for

example, continue a bootstrap after fixing a bug which causes the

stage2 build to crash.  It does not provide as good coverage of the

compiler as bootstrapping from scratch, but it ensures that the new

code is syntactically correct (e.g., that you did not use GCC extensions

by mistake), and avoids spurious bootstrap comparison

failures@footnote{Except if the compiler was buggy and miscompiled

some of the files that were not modified.  In this case, it's best

to use @command{make restrap}.}.

Other targets available from the top level include:

@table @code

@item bootstrap-lean

Like @code{bootstrap}, except that the various stages are removed once

they're no longer needed.  This saves disk space.

@item bootstrap2

@itemx bootstrap2-lean

Performs only the first two stages of bootstrap.  Unlike a three-stage

bootstrap, this does not perform a comparison to test that the compiler

is running properly.  Note that the disk space required by a ``lean''

bootstrap is approximately independent of the number of stages.

@item stage@var{N}-bubble (@var{N} = 1@dots{}4, profile, feedback)

Rebuild all the stages up to @var{N}, with the appropriate flags,

``bubbling'' the changes as described above.

@item all-stage@var{N} (@var{N} = 1@dots{}4, profile, feedback)

Assuming that stage @var{N} has already been built, rebuild it with the

appropriate flags.  This is rarely needed.

@item cleanstrap

Remove everything (@samp{make clean}) and rebuilds (@samp{make bootstrap}).

@item compare

Compares the results of stages 2 and 3.  This ensures that the compiler

is running properly, since it should produce the same object files

regardless of how it itself was compiled.

@item profiledbootstrap

Builds a compiler with profiling feedback information.  In this case,

the second and third stages are named @samp{profile} and @samp{feedback},

respectively.  For more information, see

@ref{Building,,Building with profile feedback,gccinstall,Installing GCC}.

@item restrap

Restart a bootstrap, so that everything that was not built with

the system compiler is rebuilt.

@item stage@var{N}-start (@var{N} = 1@dots{}4, profile, feedback)

For each package that is bootstrapped, rename directories so that,

for example, @file{gcc} points to the stage@var{N} GCC, compiled

with the stage@var{N-1} GCC@footnote{Customarily, the system compiler

is also termed the @file{stage0} GCC.}.

You will invoke this target if you need to test or debug the

stage@var{N} GCC@.  If you only need to execute GCC (but you need

not run @samp{make} either to rebuild it or to run test suites),

you should be able to work directly in the @file{stage@var{N}-gcc}

directory.  This makes it easier to debug multiple stages in

parallel.

@item stage

For each package that is bootstrapped, relocate its build directory

to indicate its stage.  For example, if the @file{gcc} directory

points to the stage2 GCC, after invoking this target it will be

renamed to @file{stage2-gcc}.

@end table

If you wish to use non-default GCC flags when compiling the stage2 and

stage3 compilers, set @code{BOOT_CFLAGS} on the command line when doing

@samp{make}.

Usually, the first stage only builds the languages that the compiler

is written in: typically, C and maybe Ada.  If you are debugging a

miscompilation of a different stage2 front-end (for example, of the

Fortran front-end), you may want to have front-ends for other languages

in the first stage as well.  To do so, set @code{STAGE1_LANGUAGES}

on the command line when doing @samp{make}.

For example, in the aforementioned scenario of debugging a Fortran

front-end miscompilation caused by the stage1 compiler, you may need a

command like

@example

make stage2-bubble STAGE1_LANGUAGES=c,fortran

@end example

Alternatively, you can use per-language targets to build and test

languages that are not enabled by default in stage1.  For example,

@command{make f951} will build a Fortran compiler even in the stage1

build directory.