mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-18 08:49:11 +08:00
777c951742
2001-02-15 Phil Edwards <pme@sources.redhat.com> * docs/html/configopts.html: Minor updates and typo fixes. * docs/html/faq/index.html: Updates of the "not really bugs" list. * docs/html/faq/index.txt: Regenerated. From-SVN: r39727
199 lines
8.0 KiB
HTML
199 lines
8.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
|
|
<HTML>
|
|
<HEAD>
|
|
<META NAME="AUTHOR" CONTENT="pme@sources.redhat.com (Phil Edwards)">
|
|
<META NAME="KEYWORDS" CONTENT="libstdc++, libstdc++-v3, GCC, g++">
|
|
<META NAME="DESCRIPTION" CONTENT="Configuration options for libstdc++-v3.">
|
|
<META NAME="GENERATOR" CONTENT="vi and eight fingers">
|
|
<TITLE>libstdc++-v3 configure options</TITLE>
|
|
<LINK REL=StyleSheet HREF="lib3styles.css">
|
|
<!-- $Id: configopts.html,v 1.6 2001/02/07 00:03:20 pme Exp $ -->
|
|
</HEAD>
|
|
<BODY>
|
|
|
|
<H1 CLASS="centered"><A NAME="top">Interesting <TT>configure</TT>
|
|
options</A></H1>
|
|
|
|
<P>The latest version of this document is always available at
|
|
<A HREF="http://gcc.gnu.org/onlinedocs/libstdc++/configopts.html">
|
|
http://gcc.gnu.org/onlinedocs/libstdc++/configopts.html</A>.
|
|
</P>
|
|
|
|
<P>To the <A HREF="http://gcc.gnu.org/libstdc++/">libstdc++-v3 homepage</A>.
|
|
|
|
|
|
<!-- ####################################################### -->
|
|
<HR>
|
|
<P>Here are some of the non-obvious options to libstdc++'s configure.
|
|
Keep in mind that
|
|
<!-- This SECnn should be the "Choosing Package Options" section. -->
|
|
<A HREF="http://sources.redhat.com/autoconf/autoconf.html#SEC74">they
|
|
all have opposite forms as well</A>
|
|
(enable/disable and with/without). The defaults are for current
|
|
development sources.
|
|
</P>
|
|
<P>The canonical way to find out the configure options that are
|
|
available for a given set of libstdc++ sources is to go to the
|
|
source directory and then type:<TT> ./configure --help</TT>
|
|
|
|
<DL>
|
|
<DT><TT>--enable-multilib </TT>[default]
|
|
<DD><P>This is part of the generic multilib support for building cross
|
|
compilers. As such, targets like "powerpc-elf" will have
|
|
libstdc++ built many different ways: "-msoft-float"
|
|
and not, etc. A different libstdc++ will be built for each of
|
|
the different multilib versions. This option is on by default.
|
|
</P>
|
|
|
|
<DT><TT>--enable-debug </TT>
|
|
<DD><P>The configure script will automatically detect the highest level
|
|
of optimization that the compiler in use can use (certain
|
|
versions of g++ will ICE if given the <TT>-O2</TT> option, but
|
|
this is fixed in later versions of the compiler). This --enable
|
|
flag will disable all optimizations and instruct the compiler to
|
|
emit as much extra debugging information as it can, for use
|
|
inside GDB.
|
|
</P>
|
|
|
|
<DT><TT>--enable-cstdio </TT>
|
|
<DD><P>This is an abbreviated form of <TT>'--enable-cstdio=stdio'</TT>
|
|
(described next).
|
|
</P>
|
|
|
|
<DT><TT>--enable-cstdio=LIB </TT>
|
|
<DD><P>Select a target-specific I/O package. As of libstdc++-v3
|
|
snapshot 2.91, the choices are 'libio' to specify the GNU
|
|
I/O package (from
|
|
<A HREF="http://sources.redhat.com/glibc/">glibc</A>, the
|
|
GNU C library), or 'stdio' to use a generic "C"
|
|
abstraction. The default is 'stdio'.
|
|
</P>
|
|
|
|
<DT><TT>--enable-clocale </TT>
|
|
<DD><P>This is an abbreviated form of <TT>'--enable-clocale=generic'</TT>
|
|
(described next).
|
|
</P>
|
|
|
|
<DT><TT>--enable-clocale=MODEL </TT>
|
|
<DD><P>Select a target-specific underlying locale package. The
|
|
choices are 'gnu' to specify an X/Open (IEEE Std. 1003.1-200x)
|
|
model based on langinfo/iconv (from <A
|
|
HREF="http://sources.redhat.com/glibc/">glibc</A>, the GNU C
|
|
library), or 'generic' to use a generic "C"
|
|
abstraction which consists of "C" locale info.
|
|
The default is 'generic'.
|
|
</P>
|
|
|
|
<DT><TT>--enable-long-long </TT>
|
|
<DD><P>The "long long" type was introduced in C99. It is
|
|
provided as a GNU extension to C++98 in g++. This flag builds
|
|
support for "long long" into the library
|
|
(specialized templates and the like). This option is off by
|
|
default: if enabled, users will have to either use the
|
|
new-style "C" headers by default (ie cmath not math.h)
|
|
or add appropriate compile-time flags to all compile lines to
|
|
allow "C" visibility of this feature (on GNU/Linux,
|
|
the flag is -D_ISOC99_SOURCE).
|
|
</P>
|
|
|
|
<DT><TT>--enable-cheaders=OPTION </TT>
|
|
<DD><P>This allows the user to define what kind of C headers are
|
|
used. Options are: c, c_std, and c_shadow. These correspond
|
|
to the source directory's include/c, include/c_std, and
|
|
include/c_shadow directories. The default is c_std.
|
|
</P>
|
|
|
|
<DT><TT>--enable-threads </TT>
|
|
<DD><P>This is an abbreviated form of <TT>'--enable-threads=yes'</TT>
|
|
(described next).
|
|
</P>
|
|
|
|
<DT><TT>--enable-threads=LIB </TT>
|
|
<DD><P>Select a threading library. As of libstdc++-v3 snapshot 2.91,
|
|
the choices are:
|
|
'yes' for some kind of default (hmmmmm);
|
|
'decosf1', 'irix', 'mach', 'os2', 'posix'/'pthreads'
|
|
(same thing),
|
|
'solaris', 'win32', 'dce', or 'vxworks' to select the
|
|
corresponding interface;
|
|
and 'single', 'no', or 'none' for the null-case,
|
|
single-threaded library.
|
|
</P>
|
|
<P>All of this is currently undergoing a lot of changes. As of
|
|
2.91, 'single' and 'posix' are the only implemented
|
|
models. Default is single.
|
|
</P>
|
|
|
|
<DT><TT>--enable-version-specific-runtime-libs </TT>
|
|
<DD><P>Specify that run-time libraries should be installed in the
|
|
compiler-specific subdirectory (i.e.,
|
|
<TT>$(libdir)/gcc-lib/$(target_alias)/$(gcc_version)</TT>)
|
|
instead of <TT>$(libdir)</TT>. This option is useful if you
|
|
intend to use several versions of gcc in parallel. In addition,
|
|
libstdc++'s include files will be installed in
|
|
<TT>$(libdir)/gcc-lib/$(target_alias)/$(gcc_version)/include/g++</TT>,
|
|
unless you also specify
|
|
<TT>--with-gxx-include-dir=_dirname_</TT> during configuration.
|
|
</P>
|
|
|
|
<DT><TT>--with-gxx-include-dir=<include-files dir></TT>
|
|
<DD><P>Adds support for named libstdc++ include directory. For instance,
|
|
the following puts all the libstdc++ headers into a directory
|
|
called "2.97-20001008" instead of the usual
|
|
"g++-v3".
|
|
<PRE>
|
|
--with-gxx-include-dir=/foo/H-x86-gcc-3-c-gxx-inc/include/2.97-20001008</PRE>
|
|
</P>
|
|
|
|
<DT><TT>--enable-cxx-flags=FLAGS</TT>
|
|
<DD><P>With this option, you can pass a string of -f (functionality)
|
|
flags to the compiler to use when building libstdc++. FLAGS
|
|
is a quoted string of options, like
|
|
<PRE>
|
|
--enable-cxx-flags='-fvtable-gc -fomit-frame-pointer -ansi'</PRE>
|
|
Note that the flags don't necessarily have to all be -f flags,
|
|
as shown, but usually those are the ones that will make sense
|
|
for experimentation and configure-time overriding.
|
|
</P>
|
|
<P>The advantage of --enable-cxx-flags over setting CXXFLAGS in
|
|
the 'make' environment is that, if files are automatically
|
|
rebuilt, the same flags will be used when compiling those files
|
|
as well, so that everything matches.
|
|
</P>
|
|
<P>Fun flags to try might include combinations of
|
|
<PRE>
|
|
-fstrict-aliasing
|
|
-fno-exceptions
|
|
-ffunction-sections
|
|
-fvtable-gc</PRE>
|
|
and opposite forms (-fno-) of the same. Tell us (the mailing
|
|
list) if you discover more!
|
|
</P>
|
|
|
|
<DT><TT>--enable-c-mbchar </TT>[default]
|
|
<DD><P>Certain template specializations are required for wide
|
|
character conversion support. This is tricky and currently
|
|
changing rapidly, and can cause problems on new platforms.
|
|
Disabling wide character specializations is useful for initial
|
|
porting steps, but builds only a subset of what is required by
|
|
ISO. Default is on, but the <TT>--enable-cstdio=stdio </TT>
|
|
option currently turns it off.
|
|
</P>
|
|
</DL>
|
|
</P>
|
|
<P>Return <A HREF="#top">to the top of the page</A> or
|
|
<A HREF="http://gcc.gnu.org/libstdc++/">to the homepage</A>.
|
|
</P>
|
|
|
|
|
|
<!-- ####################################################### -->
|
|
|
|
<HR>
|
|
<P CLASS="fineprint"><EM>
|
|
$Id: configopts.html,v 1.6 2001/02/07 00:03:20 pme Exp $
|
|
</EM></P>
|
|
|
|
|
|
</BODY>
|
|
</HTML>
|