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4 Installing GCC: Configuration
*******************************
Like most GNU software, GCC must be configured before it can be
built. This document describes the recommended configuration procedure
for both native and cross targets.
We use SRCDIR to refer to the toplevel source directory for GCC; we
use OBJDIR to refer to the toplevel build/object directory.
If you obtained the sources via SVN, SRCDIR must refer to the top
`gcc' directory, the one where the `MAINTAINERS' can be found, and not
its `gcc' subdirectory, otherwise the build will fail.
If either SRCDIR or OBJDIR is located on an automounted NFS file
system, the shell's built-in `pwd' command will return temporary
pathnames. Using these can lead to various sorts of build problems.
To avoid this issue, set the `PWDCMD' environment variable to an
automounter-aware `pwd' command, e.g., `pawd' or `amq -w', during the
configuration and build phases.
First, we *highly* recommend that GCC be built into a separate
directory than the sources which does *not* reside within the source
tree. This is how we generally build GCC; building where SRCDIR ==
OBJDIR should still work, but doesn't get extensive testing; building
where OBJDIR is a subdirectory of SRCDIR is unsupported.
If you have previously built GCC in the same directory for a
different target machine, do `make distclean' to delete all files that
might be invalid. One of the files this deletes is `Makefile'; if
`make distclean' complains that `Makefile' does not exist or issues a
message like "don't know how to make distclean" it probably means that
the directory is already suitably clean. However, with the recommended
method of building in a separate OBJDIR, you should simply use a
different OBJDIR for each target.
Second, when configuring a native system, either `cc' or `gcc' must
be in your path or you must set `CC' in your environment before running
configure. Otherwise the configuration scripts may fail.
To configure GCC:
% mkdir OBJDIR
% cd OBJDIR
% SRCDIR/configure [OPTIONS] [TARGET]
Distributor options
===================
If you will be distributing binary versions of GCC, with modifications
to the source code, you should use the options described in this
section to make clear that your version contains modifications.
`--with-pkgversion=VERSION'
Specify a string that identifies your package. You may wish to
include a build number or build date. This version string will be
included in the output of `gcc --version'. This suffix does not
replace the default version string, only the `GCC' part.
The default value is `GCC'.
`--with-bugurl=URL'
Specify the URL that users should visit if they wish to report a
bug. You are of course welcome to forward bugs reported to you to
the FSF, if you determine that they are not bugs in your
modifications.
The default value refers to the FSF's GCC bug tracker.
Target specification
====================
* GCC has code to correctly determine the correct value for TARGET
for nearly all native systems. Therefore, we highly recommend you
not provide a configure target when configuring a native compiler.
* TARGET must be specified as `--target=TARGET' when configuring a
cross compiler; examples of valid targets would be m68k-coff,
sh-elf, etc.
* Specifying just TARGET instead of `--target=TARGET' implies that
the host defaults to TARGET.
Options specification
=====================
Use OPTIONS to override several configure time options for GCC. A list
of supported OPTIONS follows; `configure --help' may list other
options, but those not listed below may not work and should not
normally be used.
Note that each `--enable' option has a corresponding `--disable'
option and that each `--with' option has a corresponding `--without'
option.
`--prefix=DIRNAME'
Specify the toplevel installation directory. This is the
recommended way to install the tools into a directory other than
the default. The toplevel installation directory defaults to
`/usr/local'.
We *highly* recommend against DIRNAME being the same or a
subdirectory of OBJDIR or vice versa. If specifying a directory
beneath a user's home directory tree, some shells will not expand
DIRNAME correctly if it contains the `~' metacharacter; use
`$HOME' instead.
The following standard `autoconf' options are supported. Normally
you should not need to use these options.
`--exec-prefix=DIRNAME'
Specify the toplevel installation directory for
architecture-dependent files. The default is `PREFIX'.
`--bindir=DIRNAME'
Specify the installation directory for the executables called
by users (such as `gcc' and `g++'). The default is
`EXEC-PREFIX/bin'.
`--libdir=DIRNAME'
Specify the installation directory for object code libraries
and internal data files of GCC. The default is
`EXEC-PREFIX/lib'.
`--libexecdir=DIRNAME'
Specify the installation directory for internal executables
of GCC. The default is `EXEC-PREFIX/libexec'.
`--with-slibdir=DIRNAME'
Specify the installation directory for the shared libgcc
library. The default is `LIBDIR'.
`--infodir=DIRNAME'
Specify the installation directory for documentation in info
format. The default is `PREFIX/info'.
`--datadir=DIRNAME'
Specify the installation directory for some
architecture-independent data files referenced by GCC. The
default is `PREFIX/share'.
`--mandir=DIRNAME'
Specify the installation directory for manual pages. The
default is `PREFIX/man'. (Note that the manual pages are
only extracts from the full GCC manuals, which are provided
in Texinfo format. The manpages are derived by an automatic
conversion process from parts of the full manual.)
`--with-gxx-include-dir=DIRNAME'
Specify the installation directory for G++ header files. The
default is `PREFIX/include/c++/VERSION'.
`--program-prefix=PREFIX'
GCC supports some transformations of the names of its programs when
installing them. This option prepends PREFIX to the names of
programs to install in BINDIR (see above). For example, specifying
`--program-prefix=foo-' would result in `gcc' being installed as
`/usr/local/bin/foo-gcc'.
`--program-suffix=SUFFIX'
Appends SUFFIX to the names of programs to install in BINDIR (see
above). For example, specifying `--program-suffix=-3.1' would
result in `gcc' being installed as `/usr/local/bin/gcc-3.1'.
`--program-transform-name=PATTERN'
Applies the `sed' script PATTERN to be applied to the names of
programs to install in BINDIR (see above). PATTERN has to consist
of one or more basic `sed' editing commands, separated by
semicolons. For example, if you want the `gcc' program name to be
transformed to the installed program `/usr/local/bin/myowngcc' and
the `g++' program name to be transformed to
`/usr/local/bin/gspecial++' without changing other program names,
you could use the pattern
`--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/''
to achieve this effect.
All three options can be combined and used together, resulting in
more complex conversion patterns. As a basic rule, PREFIX (and
SUFFIX) are prepended (appended) before further transformations
can happen with a special transformation script PATTERN.
As currently implemented, this option only takes effect for native
builds; cross compiler binaries' names are not transformed even
when a transformation is explicitly asked for by one of these
options.
For native builds, some of the installed programs are also
installed with the target alias in front of their name, as in
`i686-pc-linux-gnu-gcc'. All of the above transformations happen
before the target alias is prepended to the name--so, specifying
`--program-prefix=foo-' and `program-suffix=-3.1', the resulting
binary would be installed as
`/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1'.
As a last shortcoming, none of the installed Ada programs are
transformed yet, which will be fixed in some time.
`--with-local-prefix=DIRNAME'
Specify the installation directory for local include files. The
default is `/usr/local'. Specify this option if you want the
compiler to search directory `DIRNAME/include' for locally
installed header files _instead_ of `/usr/local/include'.
You should specify `--with-local-prefix' *only* if your site has a
different convention (not `/usr/local') for where to put
site-specific files.
The default value for `--with-local-prefix' is `/usr/local'
regardless of the value of `--prefix'. Specifying `--prefix' has
no effect on which directory GCC searches for local header files.
This may seem counterintuitive, but actually it is logical.
The purpose of `--prefix' is to specify where to _install GCC_.
The local header files in `/usr/local/include'--if you put any in
that directory--are not part of GCC. They are part of other
programs--perhaps many others. (GCC installs its own header files
in another directory which is based on the `--prefix' value.)
Both the local-prefix include directory and the GCC-prefix include
directory are part of GCC's "system include" directories.
Although these two directories are not fixed, they need to be
searched in the proper order for the correct processing of the
include_next directive. The local-prefix include directory is
searched before the GCC-prefix include directory. Another
characteristic of system include directories is that pedantic
warnings are turned off for headers in these directories.
Some autoconf macros add `-I DIRECTORY' options to the compiler
command line, to ensure that directories containing installed
packages' headers are searched. When DIRECTORY is one of GCC's
system include directories, GCC will ignore the option so that
system directories continue to be processed in the correct order.
This may result in a search order different from what was
specified but the directory will still be searched.
GCC automatically searches for ordinary libraries using
`GCC_EXEC_PREFIX'. Thus, when the same installation prefix is
used for both GCC and packages, GCC will automatically search for
both headers and libraries. This provides a configuration that is
easy to use. GCC behaves in a manner similar to that when it is
installed as a system compiler in `/usr'.
Sites that need to install multiple versions of GCC may not want to
use the above simple configuration. It is possible to use the
`--program-prefix', `--program-suffix' and
`--program-transform-name' options to install multiple versions
into a single directory, but it may be simpler to use different
prefixes and the `--with-local-prefix' option to specify the
location of the site-specific files for each version. It will
then be necessary for users to specify explicitly the location of
local site libraries (e.g., with `LIBRARY_PATH').
The same value can be used for both `--with-local-prefix' and
`--prefix' provided it is not `/usr'. This can be used to avoid
the default search of `/usr/local/include'.
*Do not* specify `/usr' as the `--with-local-prefix'! The
directory you use for `--with-local-prefix' *must not* contain any
of the system's standard header files. If it did contain them,
certain programs would be miscompiled (including GNU Emacs, on
certain targets), because this would override and nullify the
header file corrections made by the `fixincludes' script.
Indications are that people who use this option use it based on
mistaken ideas of what it is for. People use it as if it
specified where to install part of GCC. Perhaps they make this
assumption because installing GCC creates the directory.
`--enable-shared[=PACKAGE[,...]]'
Build shared versions of libraries, if shared libraries are
supported on the target platform. Unlike GCC 2.95.x and earlier,
shared libraries are enabled by default on all platforms that
support shared libraries.
If a list of packages is given as an argument, build shared
libraries only for the listed packages. For other packages, only
static libraries will be built. Package names currently
recognized in the GCC tree are `libgcc' (also known as `gcc'),
`libstdc++' (not `libstdc++-v3'), `libffi', `zlib', `boehm-gc',
`ada', `libada', `libjava' and `libobjc'. Note `libiberty' does
not support shared libraries at all.
Use `--disable-shared' to build only static libraries. Note that
`--disable-shared' does not accept a list of package names as
argument, only `--enable-shared' does.
`--with-gnu-as'
Specify that the compiler should assume that the assembler it
finds is the GNU assembler. However, this does not modify the
rules to find an assembler and will result in confusion if the
assembler found is not actually the GNU assembler. (Confusion may
also result if the compiler finds the GNU assembler but has not
been configured with `--with-gnu-as'.) If you have more than one
assembler installed on your system, you may want to use this
option in connection with `--with-as=PATHNAME' or
`--with-build-time-tools=PATHNAME'.
The following systems are the only ones where it makes a difference
whether you use the GNU assembler. On any other system,
`--with-gnu-as' has no effect.
* `hppa1.0-ANY-ANY'
* `hppa1.1-ANY-ANY'
* `sparc-sun-solaris2.ANY'
* `sparc64-ANY-solaris2.ANY'
`--with-as=PATHNAME'
Specify that the compiler should use the assembler pointed to by
PATHNAME, rather than the one found by the standard rules to find
an assembler, which are:
* Unless GCC is being built with a cross compiler, check the
`LIBEXEC/gcc/TARGET/VERSION' directory. LIBEXEC defaults to
`EXEC-PREFIX/libexec'; EXEC-PREFIX defaults to PREFIX, which
defaults to `/usr/local' unless overridden by the
`--prefix=PATHNAME' switch described above. TARGET is the
target system triple, such as `sparc-sun-solaris2.7', and
VERSION denotes the GCC version, such as 3.0.
* If the target system is the same that you are building on,
check operating system specific directories (e.g.
`/usr/ccs/bin' on Sun Solaris 2).
* Check in the `PATH' for a tool whose name is prefixed by the
target system triple.
* Check in the `PATH' for a tool whose name is not prefixed by
the target system triple, if the host and target system
triple are the same (in other words, we use a host tool if it
can be used for the target as well).
You may want to use `--with-as' if no assembler is installed in
the directories listed above, or if you have multiple assemblers
installed and want to choose one that is not found by the above
rules.
`--with-gnu-ld'
Same as `--with-gnu-as' but for the linker.
`--with-ld=PATHNAME'
Same as `--with-as' but for the linker.
`--with-stabs'
Specify that stabs debugging information should be used instead of
whatever format the host normally uses. Normally GCC uses the
same debug format as the host system.
On MIPS based systems and on Alphas, you must specify whether you
want GCC to create the normal ECOFF debugging format, or to use
BSD-style stabs passed through the ECOFF symbol table. The normal
ECOFF debug format cannot fully handle languages other than C.
BSD stabs format can handle other languages, but it only works
with the GNU debugger GDB.
Normally, GCC uses the ECOFF debugging format by default; if you
prefer BSD stabs, specify `--with-stabs' when you configure GCC.
No matter which default you choose when you configure GCC, the user
can use the `-gcoff' and `-gstabs+' options to specify explicitly
the debug format for a particular compilation.
`--with-stabs' is meaningful on the ISC system on the 386, also, if
`--with-gas' is used. It selects use of stabs debugging
information embedded in COFF output. This kind of debugging
information supports C++ well; ordinary COFF debugging information
does not.
`--with-stabs' is also meaningful on 386 systems running SVR4. It
selects use of stabs debugging information embedded in ELF output.
The C++ compiler currently (2.6.0) does not support the DWARF
debugging information normally used on 386 SVR4 platforms; stabs
provide a workable alternative. This requires gas and gdb, as the
normal SVR4 tools can not generate or interpret stabs.
`--disable-multilib'
Specify that multiple target libraries to support different target
variants, calling conventions, etc. should not be built. The
default is to build a predefined set of them.
Some targets provide finer-grained control over which multilibs
are built (e.g., `--disable-softfloat'):
`arc-*-elf*'
biendian.
`arm-*-*'
fpu, 26bit, underscore, interwork, biendian, nofmult.
`m68*-*-*'
softfloat, m68881, m68000, m68020.
`mips*-*-*'
single-float, biendian, softfloat.
`powerpc*-*-*, rs6000*-*-*'
aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos,
biendian, sysv, aix.
`--enable-threads'
Specify that the target supports threads. This affects the
Objective-C compiler and runtime library, and exception handling
for other languages like C++ and Java. On some systems, this is
the default.
In general, the best (and, in many cases, the only known) threading
model available will be configured for use. Beware that on some
systems, GCC has not been taught what threading models are
generally available for the system. In this case,
`--enable-threads' is an alias for `--enable-threads=single'.
`--disable-threads'
Specify that threading support should be disabled for the system.
This is an alias for `--enable-threads=single'.
`--enable-threads=LIB'
Specify that LIB is the thread support library. This affects the
Objective-C compiler and runtime library, and exception handling
for other languages like C++ and Java. The possibilities for LIB
are:
`aix'
AIX thread support.
`dce'
DCE thread support.
`gnat'
Ada tasking support. For non-Ada programs, this setting is
equivalent to `single'. When used in conjunction with the
Ada run time, it causes GCC to use the same thread primitives
as Ada uses. This option is necessary when using both Ada
and the back end exception handling, which is the default for
most Ada targets.
`mach'
Generic MACH thread support, known to work on NeXTSTEP.
(Please note that the file needed to support this
configuration, `gthr-mach.h', is missing and thus this
setting will cause a known bootstrap failure.)
`no'
This is an alias for `single'.
`posix'
Generic POSIX/Unix98 thread support.
`posix95'
Generic POSIX/Unix95 thread support.
`rtems'
RTEMS thread support.
`single'
Disable thread support, should work for all platforms.
`solaris'
Sun Solaris 2 thread support.
`vxworks'
VxWorks thread support.
`win32'
Microsoft Win32 API thread support.
`nks'
Novell Kernel Services thread support.
`--enable-tls'
Specify that the target supports TLS (Thread Local Storage).
Usually configure can correctly determine if TLS is supported. In
cases where it guesses incorrectly, TLS can be explicitly enabled
or disabled with `--enable-tls' or `--disable-tls'. This can
happen if the assembler supports TLS but the C library does not,
or if the assumptions made by the configure test are incorrect.
`--disable-tls'
Specify that the target does not support TLS. This is an alias
for `--enable-tls=no'.
`--with-cpu=CPU'
`--with-cpu-32=CPU'
`--with-cpu-64=CPU'
Specify which cpu variant the compiler should generate code for by
default. CPU will be used as the default value of the `-mcpu='
switch. This option is only supported on some targets, including
ARM, i386, M68k, PowerPC, and SPARC. The `--with-cpu-32' and
`--with-cpu-64' options specify separate default CPUs for 32-bit
and 64-bit modes; these options are only supported for i386,
x86-64 and PowerPC.
`--with-schedule=CPU'
`--with-arch=CPU'
`--with-arch-32=CPU'
`--with-arch-64=CPU'
`--with-tune=CPU'
`--with-tune-32=CPU'
`--with-tune-64=CPU'
`--with-abi=ABI'
`--with-fpu=TYPE'
`--with-float=TYPE'
These configure options provide default values for the
`-mschedule=', `-march=', `-mtune=', `-mabi=', and `-mfpu='
options and for `-mhard-float' or `-msoft-float'. As with
`--with-cpu', which switches will be accepted and acceptable values
of the arguments depend on the target.
`--with-mode=MODE'
Specify if the compiler should default to `-marm' or `-mthumb'.
This option is only supported on ARM targets.
`--with-divide=TYPE'
Specify how the compiler should generate code for checking for
division by zero. This option is only supported on the MIPS
target. The possibilities for TYPE are:
`traps'
Division by zero checks use conditional traps (this is the
default on systems that support conditional traps).
`breaks'
Division by zero checks use the break instruction.
`--with-llsc'
On MIPS targets, make `-mllsc' the default when no `-mno-lsc'
option is passed. This is the default for Linux-based targets, as
the kernel will emulate them if the ISA does not provide them.
`--without-llsc'
On MIPS targets, make `-mno-llsc' the default when no `-mllsc'
option is passed.
`--with-mips-plt'
On MIPS targets, make use of copy relocations and PLTs. These
features are extensions to the traditional SVR4-based MIPS ABIs
and require support from GNU binutils and the runtime C library.
`--enable-__cxa_atexit'
Define if you want to use __cxa_atexit, rather than atexit, to
register C++ destructors for local statics and global objects.
This is essential for fully standards-compliant handling of
destructors, but requires __cxa_atexit in libc. This option is
currently only available on systems with GNU libc. When enabled,
this will cause `-fuse-cxa-atexit' to be passed by default.
`--enable-target-optspace'
Specify that target libraries should be optimized for code space
instead of code speed. This is the default for the m32r platform.
`--disable-cpp'
Specify that a user visible `cpp' program should not be installed.
`--with-cpp-install-dir=DIRNAME'
Specify that the user visible `cpp' program should be installed in
`PREFIX/DIRNAME/cpp', in addition to BINDIR.
`--enable-initfini-array'
Force the use of sections `.init_array' and `.fini_array' (instead
of `.init' and `.fini') for constructors and destructors. Option
`--disable-initfini-array' has the opposite effect. If neither
option is specified, the configure script will try to guess
whether the `.init_array' and `.fini_array' sections are supported
and, if they are, use them.
`--enable-maintainer-mode'
The build rules that regenerate the GCC master message catalog
`gcc.pot' are normally disabled. This is because it can only be
rebuilt if the complete source tree is present. If you have
changed the sources and want to rebuild the catalog, configuring
with `--enable-maintainer-mode' will enable this. Note that you
need a recent version of the `gettext' tools to do so.
`--disable-bootstrap'
For a native build, the default configuration is to perform a
3-stage bootstrap of the compiler when `make' is invoked, testing
that GCC can compile itself correctly. If you want to disable
this process, you can configure with `--disable-bootstrap'.
`--enable-bootstrap'
In special cases, you may want to perform a 3-stage build even if
the target and host triplets are different. This could happen
when the host can run code compiled for the target (e.g. host is
i686-linux, target is i486-linux). Starting from GCC 4.2, to do
this you have to configure explicitly with `--enable-bootstrap'.
`--enable-generated-files-in-srcdir'
Neither the .c and .h files that are generated from Bison and flex
nor the info manuals and man pages that are built from the .texi
files are present in the SVN development tree. When building GCC
from that development tree, or from one of our snapshots, those
generated files are placed in your build directory, which allows
for the source to be in a readonly directory.
If you configure with `--enable-generated-files-in-srcdir' then
those generated files will go into the source directory. This is
mainly intended for generating release or prerelease tarballs of
the GCC sources, since it is not a requirement that the users of
source releases to have flex, Bison, or makeinfo.
`--enable-version-specific-runtime-libs'
Specify that runtime libraries should be installed in the compiler
specific subdirectory (`LIBDIR/gcc') rather than the usual places.
In addition, `libstdc++''s include files will be installed into
`LIBDIR' unless you overruled it by using
`--with-gxx-include-dir=DIRNAME'. Using this option is
particularly useful if you intend to use several versions of GCC in
parallel. This is currently supported by `libgfortran',
`libjava', `libmudflap', `libstdc++', and `libobjc'.
`--enable-languages=LANG1,LANG2,...'
Specify that only a particular subset of compilers and their
runtime libraries should be built. For a list of valid values for
LANGN you can issue the following command in the `gcc' directory
of your GCC source tree:
grep language= */config-lang.in
Currently, you can use any of the following: `all', `ada', `c',
`c++', `fortran', `java', `objc', `obj-c++'. Building the Ada
compiler has special requirements, see below. If you do not pass
this flag, or specify the option `all', then all default languages
available in the `gcc' sub-tree will be configured. Ada and
Objective-C++ are not default languages; the rest are.
Re-defining `LANGUAGES' when calling `make' *does not* work
anymore, as those language sub-directories might not have been
configured!
`--enable-stage1-languages=LANG1,LANG2,...'
Specify that a particular subset of compilers and their runtime
libraries should be built with the system C compiler during stage
1 of the bootstrap process, rather than only in later stages with
the bootstrapped C compiler. The list of valid values is the same
as for `--enable-languages', and the option `all' will select all
of the languages enabled by `--enable-languages'. This option is
primarily useful for GCC development; for instance, when a
development version of the compiler cannot bootstrap due to
compiler bugs, or when one is debugging front ends other than the
C front end. When this option is used, one can then build the
target libraries for the specified languages with the stage-1
compiler by using `make stage1-bubble all-target', or run the
testsuite on the stage-1 compiler for the specified languages
using `make stage1-start check-gcc'.
`--disable-libada'
Specify that the run-time libraries and tools used by GNAT should
not be built. This can be useful for debugging, or for
compatibility with previous Ada build procedures, when it was
required to explicitly do a `make -C gcc gnatlib_and_tools'.
`--disable-libssp'
Specify that the run-time libraries for stack smashing protection
should not be built.
`--disable-libgomp'
Specify that the run-time libraries used by GOMP should not be
built.
`--with-dwarf2'
Specify that the compiler should use DWARF 2 debugging information
as the default.
`--enable-targets=all'
`--enable-targets=TARGET_LIST'
Some GCC targets, e.g. powerpc64-linux, build bi-arch compilers.
These are compilers that are able to generate either 64-bit or
32-bit code. Typically, the corresponding 32-bit target, e.g.
powerpc-linux for powerpc64-linux, only generates 32-bit code.
This option enables the 32-bit target to be a bi-arch compiler,
which is useful when you want a bi-arch compiler that defaults to
32-bit, and you are building a bi-arch or multi-arch binutils in a
combined tree. Currently, this option only affects sparc-linux,
powerpc-linux and x86-linux.
`--enable-secureplt'
This option enables `-msecure-plt' by default for powerpc-linux.
RS/6000 and PowerPC Options (gcc)RS/6000 and PowerPC
Options,
`--enable-cld'
This option enables `-mcld' by default for 32-bit x86 targets.
i386 and x86-64 Options (gcc)i386 and x86-64 Options,
`--enable-win32-registry'
`--enable-win32-registry=KEY'
`--disable-win32-registry'
The `--enable-win32-registry' option enables Microsoft
Windows-hosted GCC to look up installations paths in the registry
using the following key:
`HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\KEY'
KEY defaults to GCC version number, and can be overridden by the
`--enable-win32-registry=KEY' option. Vendors and distributors
who use custom installers are encouraged to provide a different
key, perhaps one comprised of vendor name and GCC version number,
to avoid conflict with existing installations. This feature is
enabled by default, and can be disabled by
`--disable-win32-registry' option. This option has no effect on
the other hosts.
`--nfp'
Specify that the machine does not have a floating point unit. This
option only applies to `m68k-sun-sunosN'. On any other system,
`--nfp' has no effect.
`--enable-werror'
`--disable-werror'
`--enable-werror=yes'
`--enable-werror=no'
When you specify this option, it controls whether certain files in
the compiler are built with `-Werror' in bootstrap stage2 and
later. If you don't specify it, `-Werror' is turned on for the
main development trunk. However it defaults to off for release
branches and final releases. The specific files which get
`-Werror' are controlled by the Makefiles.
`--enable-checking'
`--enable-checking=LIST'
When you specify this option, the compiler is built to perform
internal consistency checks of the requested complexity. This
does not change the generated code, but adds error checking within
the compiler. This will slow down the compiler and may only work
properly if you are building the compiler with GCC. This is `yes'
by default when building from SVN or snapshots, but `release' for
releases. The default for building the stage1 compiler is `yes'.
More control over the checks may be had by specifying LIST. The
categories of checks available are `yes' (most common checks
`assert,misc,tree,gc,rtlflag,runtime'), `no' (no checks at all),
`all' (all but `valgrind'), `release' (cheapest checks
`assert,runtime') or `none' (same as `no'). Individual checks can
be enabled with these flags `assert', `df', `fold', `gc', `gcac'
`misc', `rtl', `rtlflag', `runtime', `tree', and `valgrind'.
The `valgrind' check requires the external `valgrind' simulator,
available from `http://valgrind.org/'. The `df', `rtl', `gcac'
and `valgrind' checks are very expensive. To disable all
checking, `--disable-checking' or `--enable-checking=none' must be
explicitly requested. Disabling assertions will make the compiler
and runtime slightly faster but increase the risk of undetected
internal errors causing wrong code to be generated.
`--disable-stage1-checking'
`--enable-stage1-checking'
`--enable-stage1-checking=LIST'
If no `--enable-checking' option is specified the stage1 compiler
will be built with `yes' checking enabled, otherwise the stage1
checking flags are the same as specified by `--enable-checking'.
To build the stage1 compiler with different checking options use
`--enable-stage1-checking'. The list of checking options is the
same as for `--enable-checking'. If your system is too slow or
too small to bootstrap a released compiler with checking for
stage1 enabled, you can use `--disable-stage1-checking' to disable
checking for the stage1 compiler.
`--enable-coverage'
`--enable-coverage=LEVEL'
With this option, the compiler is built to collect self coverage
information, every time it is run. This is for internal
development purposes, and only works when the compiler is being
built with gcc. The LEVEL argument controls whether the compiler
is built optimized or not, values are `opt' and `noopt'. For
coverage analysis you want to disable optimization, for
performance analysis you want to enable optimization. When
coverage is enabled, the default level is without optimization.
`--enable-gather-detailed-mem-stats'
When this option is specified more detailed information on memory
allocation is gathered. This information is printed when using
`-fmem-report'.
`--with-gc'
`--with-gc=CHOICE'
With this option you can specify the garbage collector
implementation used during the compilation process. CHOICE can be
one of `page' and `zone', where `page' is the default.
`--enable-nls'
`--disable-nls'
The `--enable-nls' option enables Native Language Support (NLS),
which lets GCC output diagnostics in languages other than American
English. Native Language Support is enabled by default if not
doing a canadian cross build. The `--disable-nls' option disables
NLS.
`--with-included-gettext'
If NLS is enabled, the `--with-included-gettext' option causes the
build procedure to prefer its copy of GNU `gettext'.
`--with-catgets'
If NLS is enabled, and if the host lacks `gettext' but has the
inferior `catgets' interface, the GCC build procedure normally
ignores `catgets' and instead uses GCC's copy of the GNU `gettext'
library. The `--with-catgets' option causes the build procedure
to use the host's `catgets' in this situation.
`--with-libiconv-prefix=DIR'
Search for libiconv header files in `DIR/include' and libiconv
library files in `DIR/lib'.
`--enable-obsolete'
Enable configuration for an obsoleted system. If you attempt to
configure GCC for a system (build, host, or target) which has been
obsoleted, and you do not specify this flag, configure will halt
with an error message.
All support for systems which have been obsoleted in one release
of GCC is removed entirely in the next major release, unless
someone steps forward to maintain the port.
`--enable-decimal-float'
`--enable-decimal-float=yes'
`--enable-decimal-float=no'
`--enable-decimal-float=bid'
`--enable-decimal-float=dpd'
`--disable-decimal-float'
Enable (or disable) support for the C decimal floating point
extension that is in the IEEE 754-2008 standard. This is enabled
by default only on PowerPC, i386, and x86_64 GNU/Linux systems.
Other systems may also support it, but require the user to
specifically enable it. You can optionally control which decimal
floating point format is used (either `bid' or `dpd'). The `bid'
(binary integer decimal) format is default on i386 and x86_64
systems, and the `dpd' (densely packed decimal) format is default
on PowerPC systems.
`--enable-fixed-point'
`--disable-fixed-point'
Enable (or disable) support for C fixed-point arithmetic. This
option is enabled by default for some targets (such as MIPS) which
have hardware-support for fixed-point operations. On other
targets, you may enable this option manually.
`--with-long-double-128'
Specify if `long double' type should be 128-bit by default on
selected GNU/Linux architectures. If using
`--without-long-double-128', `long double' will be by default
64-bit, the same as `double' type. When neither of these
configure options are used, the default will be 128-bit `long
double' when built against GNU C Library 2.4 and later, 64-bit
`long double' otherwise.
`--with-gmp=PATHNAME'
`--with-gmp-include=PATHNAME'
`--with-gmp-lib=PATHNAME'
`--with-mpfr=PATHNAME'
`--with-mpfr-include=PATHNAME'
`--with-mpfr-lib=PATHNAME'
If you do not have GMP (the GNU Multiple Precision library) and the
MPFR Libraries installed in a standard location and you want to
build GCC, you can explicitly specify the directory where they are
installed (`--with-gmp=GMPINSTALLDIR',
`--with-mpfr=MPFRINSTALLDIR'). The `--with-gmp=GMPINSTALLDIR'
option is shorthand for `--with-gmp-lib=GMPINSTALLDIR/lib' and
`--with-gmp-include=GMPINSTALLDIR/include'. Likewise the
`--with-mpfr=MPFRINSTALLDIR' option is shorthand for
`--with-mpfr-lib=MPFRINSTALLDIR/lib' and
`--with-mpfr-include=MPFRINSTALLDIR/include'. If these shorthand
assumptions are not correct, you can use the explicit include and
lib options directly.
`--with-ppl=PATHNAME'
`--with-ppl-include=PATHNAME'
`--with-ppl-lib=PATHNAME'
`--with-cloog=PATHNAME'
`--with-cloog-include=PATHNAME'
`--with-cloog-lib=PATHNAME'
If you do not have PPL (the Parma Polyhedra Library) and the CLooG
libraries installed in a standard location and you want to build
GCC, you can explicitly specify the directory where they are
installed (`--with-ppl=PPLINSTALLDIR',
`--with-cloog=CLOOGINSTALLDIR'). The `--with-ppl=PPLINSTALLDIR'
option is shorthand for `--with-ppl-lib=PPLINSTALLDIR/lib' and
`--with-ppl-include=PPLINSTALLDIR/include'. Likewise the
`--with-cloog=CLOOGINSTALLDIR' option is shorthand for
`--with-cloog-lib=CLOOGINSTALLDIR/lib' and
`--with-cloog-include=CLOOGINSTALLDIR/include'. If these
shorthand assumptions are not correct, you can use the explicit
include and lib options directly.
`--with-host-libstdcxx=LINKER-ARGS'
If you are linking with a static copy of PPL, you can use this
option to specify how the linker should find the standard C++
library used internally by PPL. Typical values of LINKER-ARGS
might be `-lstdc++' or `-Wl,-Bstatic,-lstdc++,-Bdynamic -lm'. If
you are linking with a shared copy of PPL, you probably do not
need this option; shared library dependencies will cause the
linker to search for the standard C++ library automatically.
`--with-debug-prefix-map=MAP'
Convert source directory names using `-fdebug-prefix-map' when
building runtime libraries. `MAP' is a space-separated list of
maps of the form `OLD=NEW'.
`--enable-gnu-unique-object'
`--disable-gnu-unique-object'
Tells GCC to use the gnu_unique_object relocation for C++ template
static data members and inline function local statics. Enabled by
default for a native toolchain with an assembler that accepts it
and GLIBC 2.11 or above, otherwise disabled.
Cross-Compiler-Specific Options
-------------------------------
The following options only apply to building cross compilers.
`--with-sysroot'
`--with-sysroot=DIR'
Tells GCC to consider DIR as the root of a tree that contains a
(subset of) the root filesystem of the target operating system.
Target system headers, libraries and run-time object files will be
searched in there. The specified directory is not copied into the
install tree, unlike the options `--with-headers' and
`--with-libs' that this option obsoletes. The default value, in
case `--with-sysroot' is not given an argument, is
`${gcc_tooldir}/sys-root'. If the specified directory is a
subdirectory of `${exec_prefix}', then it will be found relative to
the GCC binaries if the installation tree is moved.
`--with-build-sysroot'
`--with-build-sysroot=DIR'
Tells GCC to consider DIR as the system root (see
`--with-sysroot') while building target libraries, instead of the
directory specified with `--with-sysroot'. This option is only
useful when you are already using `--with-sysroot'. You can use
`--with-build-sysroot' when you are configuring with `--prefix'
set to a directory that is different from the one in which you are
installing GCC and your target libraries.
This option affects the system root for the compiler used to build
target libraries (which runs on the build system); it does not
affect the compiler which is used to build GCC itself.
`--with-headers'
`--with-headers=DIR'
Deprecated in favor of `--with-sysroot'. Specifies that target
headers are available when building a cross compiler. The DIR
argument specifies a directory which has the target include files.
These include files will be copied into the `gcc' install
directory. _This option with the DIR argument is required_ when
building a cross compiler, if `PREFIX/TARGET/sys-include' doesn't
pre-exist. If `PREFIX/TARGET/sys-include' does pre-exist, the DIR
argument may be omitted. `fixincludes' will be run on these files
to make them compatible with GCC.
`--without-headers'
Tells GCC not use any target headers from a libc when building a
cross compiler. When crossing to GNU/Linux, you need the headers
so GCC can build the exception handling for libgcc.
`--with-libs'
`--with-libs=``DIR1 DIR2 ... DIRN'''
Deprecated in favor of `--with-sysroot'. Specifies a list of
directories which contain the target runtime libraries. These
libraries will be copied into the `gcc' install directory. If the
directory list is omitted, this option has no effect.
`--with-newlib'
Specifies that `newlib' is being used as the target C library.
This causes `__eprintf' to be omitted from `libgcc.a' on the
assumption that it will be provided by `newlib'.
`--with-build-time-tools=DIR'
Specifies where to find the set of target tools (assembler,
linker, etc.) that will be used while building GCC itself. This
option can be useful if the directory layouts are different
between the system you are building GCC on, and the system where
you will deploy it.
For example, on a `ia64-hp-hpux' system, you may have the GNU
assembler and linker in `/usr/bin', and the native tools in a
different path, and build a toolchain that expects to find the
native tools in `/usr/bin'.
When you use this option, you should ensure that DIR includes
`ar', `as', `ld', `nm', `ranlib' and `strip' if necessary, and
possibly `objdump'. Otherwise, GCC may use an inconsistent set of
tools.
Java-Specific Options
---------------------
The following option applies to the build of the Java front end.
`--disable-libgcj'
Specify that the run-time libraries used by GCJ should not be
built. This is useful in case you intend to use GCJ with some
other run-time, or you're going to install it separately, or it
just happens not to build on your particular machine. In general,
if the Java front end is enabled, the GCJ libraries will be
enabled too, unless they're known to not work on the target
platform. If GCJ is enabled but `libgcj' isn't built, you may
need to port it; in this case, before modifying the top-level
`configure.in' so that `libgcj' is enabled by default on this
platform, you may use `--enable-libgcj' to override the default.
The following options apply to building `libgcj'.
General Options
...............
`--enable-java-maintainer-mode'
By default the `libjava' build will not attempt to compile the
`.java' source files to `.class'. Instead, it will use the
`.class' files from the source tree. If you use this option you
must have executables named `ecj1' and `gjavah' in your path for
use by the build. You must use this option if you intend to
modify any `.java' files in `libjava'.
`--with-java-home=DIRNAME'
This `libjava' option overrides the default value of the
`java.home' system property. It is also used to set
`sun.boot.class.path' to `DIRNAME/lib/rt.jar'. By default
`java.home' is set to `PREFIX' and `sun.boot.class.path' to
`DATADIR/java/libgcj-VERSION.jar'.
`--with-ecj-jar=FILENAME'
This option can be used to specify the location of an external jar
file containing the Eclipse Java compiler. A specially modified
version of this compiler is used by `gcj' to parse `.java' source
files. If this option is given, the `libjava' build will create
and install an `ecj1' executable which uses this jar file at
runtime.
If this option is not given, but an `ecj.jar' file is found in the
topmost source tree at configure time, then the `libgcj' build
will create and install `ecj1', and will also install the
discovered `ecj.jar' into a suitable place in the install tree.
If `ecj1' is not installed, then the user will have to supply one
on his path in order for `gcj' to properly parse `.java' source
files. A suitable jar is available from
`ftp://sourceware.org/pub/java/'.
`--disable-getenv-properties'
Don't set system properties from `GCJ_PROPERTIES'.
`--enable-hash-synchronization'
Use a global hash table for monitor locks. Ordinarily, `libgcj''s
`configure' script automatically makes the correct choice for this
option for your platform. Only use this if you know you need the
library to be configured differently.
`--enable-interpreter'
Enable the Java interpreter. The interpreter is automatically
enabled by default on all platforms that support it. This option
is really only useful if you want to disable the interpreter
(using `--disable-interpreter').
`--disable-java-net'
Disable java.net. This disables the native part of java.net only,
using non-functional stubs for native method implementations.
`--disable-jvmpi'
Disable JVMPI support.
`--disable-libgcj-bc'
Disable BC ABI compilation of certain parts of libgcj. By default,
some portions of libgcj are compiled with `-findirect-dispatch'
and `-fno-indirect-classes', allowing them to be overridden at
run-time.
If `--disable-libgcj-bc' is specified, libgcj is built without
these options. This allows the compile-time linker to resolve
dependencies when statically linking to libgcj. However it makes
it impossible to override the affected portions of libgcj at
run-time.
`--enable-reduced-reflection'
Build most of libgcj with `-freduced-reflection'. This reduces
the size of libgcj at the expense of not being able to do accurate
reflection on the classes it contains. This option is safe if you
know that code using libgcj will never use reflection on the
standard runtime classes in libgcj (including using serialization,
RMI or CORBA).
`--with-ecos'
Enable runtime eCos target support.
`--without-libffi'
Don't use `libffi'. This will disable the interpreter and JNI
support as well, as these require `libffi' to work.
`--enable-libgcj-debug'
Enable runtime debugging code.
`--enable-libgcj-multifile'
If specified, causes all `.java' source files to be compiled into
`.class' files in one invocation of `gcj'. This can speed up
build time, but is more resource-intensive. If this option is
unspecified or disabled, `gcj' is invoked once for each `.java'
file to compile into a `.class' file.
`--with-libiconv-prefix=DIR'
Search for libiconv in `DIR/include' and `DIR/lib'.
`--enable-sjlj-exceptions'
Force use of the `setjmp'/`longjmp'-based scheme for exceptions.
`configure' ordinarily picks the correct value based on the
platform. Only use this option if you are sure you need a
different setting.
`--with-system-zlib'
Use installed `zlib' rather than that included with GCC.
`--with-win32-nlsapi=ansi, unicows or unicode'
Indicates how MinGW `libgcj' translates between UNICODE characters
and the Win32 API.
`--enable-java-home'
If enabled, this creates a JPackage compatible SDK environment
during install. Note that if -enable-java-home is used,
-with-arch-directory=ARCH must also be specified.
`--with-arch-directory=ARCH'
Specifies the name to use for the `jre/lib/ARCH' directory in the
SDK environment created when -enable-java-home is passed. Typical
names for this directory include i386, amd64, ia64, etc.
`--with-os-directory=DIR'
Specifies the OS directory for the SDK include directory. This is
set to auto detect, and is typically 'linux'.
`--with-origin-name=NAME'
Specifies the JPackage origin name. This defaults to the 'gcj' in
java-1.5.0-gcj.
`--with-arch-suffix=SUFFIX'
Specifies the suffix for the sdk directory. Defaults to the empty
string. Examples include '.x86_64' in
'java-1.5.0-gcj-1.5.0.0.x86_64'.
`--with-jvm-root-dir=DIR'
Specifies where to install the SDK. Default is $(prefix)/lib/jvm.
`--with-jvm-jar-dir=DIR'
Specifies where to install jars. Default is
$(prefix)/lib/jvm-exports.
`--with-python-dir=DIR'
Specifies where to install the Python modules used for
aot-compile. DIR should not include the prefix used in
installation. For example, if the Python modules are to be
installed in /usr/lib/python2.5/site-packages, then
-with-python-dir=/lib/python2.5/site-packages should be passed. If
this is not specified, then the Python modules are installed in
$(prefix)/share/python.
`--enable-aot-compile-rpm'
Adds aot-compile-rpm to the list of installed scripts.
`ansi'
Use the single-byte `char' and the Win32 A functions natively,
translating to and from UNICODE when using these functions.
If unspecified, this is the default.
`unicows'
Use the `WCHAR' and Win32 W functions natively. Adds
`-lunicows' to `libgcj.spec' to link with `libunicows'.
`unicows.dll' needs to be deployed on Microsoft Windows 9X
machines running built executables. `libunicows.a', an
open-source import library around Microsoft's `unicows.dll',
is obtained from `http://libunicows.sourceforge.net/', which
also gives details on getting `unicows.dll' from Microsoft.
`unicode'
Use the `WCHAR' and Win32 W functions natively. Does _not_
add `-lunicows' to `libgcj.spec'. The built executables will
only run on Microsoft Windows NT and above.
AWT-Specific Options
....................
`--with-x'
Use the X Window System.
`--enable-java-awt=PEER(S)'
Specifies the AWT peer library or libraries to build alongside
`libgcj'. If this option is unspecified or disabled, AWT will be
non-functional. Current valid values are `gtk' and `xlib'.
Multiple libraries should be separated by a comma (i.e.
`--enable-java-awt=gtk,xlib').
`--enable-gtk-cairo'
Build the cairo Graphics2D implementation on GTK.
`--enable-java-gc=TYPE'
Choose garbage collector. Defaults to `boehm' if unspecified.
`--disable-gtktest'
Do not try to compile and run a test GTK+ program.
`--disable-glibtest'
Do not try to compile and run a test GLIB program.
`--with-libart-prefix=PFX'
Prefix where libart is installed (optional).
`--with-libart-exec-prefix=PFX'
Exec prefix where libart is installed (optional).
`--disable-libarttest'
Do not try to compile and run a test libart program.
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