2000-04-21 22:33:34 +02:00
|
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
|
|
|
|
|
<HTML>
|
|
|
|
|
<HEAD>
|
|
|
|
|
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
|
2000-07-11 23:45:08 +02:00
|
|
|
<META NAME="AUTHOR" CONTENT="pme@sources.redhat.com (Phil Edwards)">
|
2000-04-21 22:33:34 +02:00
|
|
|
<META NAME="KEYWORDS" CONTENT="libstdc++, libstdc++-v3, egcs, g++">
|
|
|
|
|
<META NAME="DESCRIPTION" CONTENT="Configuration options for libstdc++-v3.">
|
|
|
|
|
<META NAME="GENERATOR" CONTENT="vi and eight fingers">
|
|
|
|
|
<TITLE>libstdc++-v3 configure options</TITLE>
|
2000-07-11 23:45:08 +02:00
|
|
|
<LINK REL="home" HREF="http://sources.redhat.com/libstdc++/">
|
2000-04-21 22:33:34 +02:00
|
|
|
<LINK REL=StyleSheet HREF="lib3styles.css">
|
2000-08-28 20:41:24 +02:00
|
|
|
<!-- $Id: configopts.html,v 1.7 2000/08/09 07:33:39 bkoz Exp $ -->
|
2000-04-21 22:33:34 +02:00
|
|
|
</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
|
2000-07-11 23:45:08 +02:00
|
|
|
<A HREF="http://sources.redhat.com/libstdc++/configopts.html">
|
|
|
|
|
http://sources.redhat.com/libstdc++/configopts.html</A>.
|
2000-04-21 22:33:34 +02:00
|
|
|
</P>
|
|
|
|
|
|
|
|
|
|
<P>To the <A HREF="index.html">libstdc++-v3 homepage</A>.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!-- ####################################################### -->
|
|
|
|
|
<HR>
|
|
|
|
|
<P>Here are some of the non-obvious options to libstdc++'s configure.
|
|
|
|
|
Keep in mind that
|
2000-05-09 22:25:13 +02:00
|
|
|
<!-- This SECnn should be the "Choosing Package Options" section. -->
|
2000-07-11 23:45:08 +02:00
|
|
|
<A HREF="http://sources.redhat.com/autoconf/autoconf.html#SEC74">they
|
2000-04-21 22:33:34 +02:00
|
|
|
all have opposite forms as well</A>
|
|
|
|
|
(enable/disable and with/without). The defaults are for the latest
|
|
|
|
|
snapshot, 2.90.8.
|
2000-08-09 09:33:39 +02:00
|
|
|
<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> ./config --help </TT>
|
|
|
|
|
|
2000-04-21 22:33:34 +02:00
|
|
|
<DL>
|
|
|
|
|
<DT><TT>--enable-multilib </TT>[default]
|
|
|
|
|
<DD><P>This is part of the generic multilib support for building
|
2000-07-11 23:45:08 +02:00
|
|
|
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.
|
2000-04-21 22:33:34 +02:00
|
|
|
</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>[default]
|
|
|
|
|
<DD><P>This is an abbreviated form of <TT>'--enable-cstdio=libio'</TT>
|
|
|
|
|
(described next).
|
|
|
|
|
</P>
|
|
|
|
|
|
|
|
|
|
<DT><TT>--enable-cstdio=LIB </TT>
|
|
|
|
|
<DD><P>Select a target-specific I/O package. As of libstdc++-v3
|
|
|
|
|
snapshot 2.90.8, the choices are 'libio' to specify the GNU
|
|
|
|
|
I/O package (from
|
2000-07-11 23:45:08 +02:00
|
|
|
<A HREF="http://sources.redhat.com/glibc/">glibc</A>, the
|
2000-04-21 22:33:34 +02:00
|
|
|
GNU C library), or 'wince' to specify the Microsoft Windows CE
|
2000-05-09 22:25:13 +02:00
|
|
|
library. Eventually a generic cstdio interface will be added
|
2000-04-21 22:33:34 +02:00
|
|
|
so that people who want to use libstdc++-v3 with say, the Palm
|
|
|
|
|
Pilot, will be able to use libstdc++-v3 without libio.
|
|
|
|
|
</P>
|
|
|
|
|
|
2000-05-19 21:55:50 +02:00
|
|
|
<DT><TT>--enable-long-long </TT>
|
2000-04-21 22:33:34 +02:00
|
|
|
<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).
|
|
|
|
|
</P>
|
|
|
|
|
|
|
|
|
|
<DT><TT>--enable-namespaces </TT>[default]
|
|
|
|
|
<DD><P>By default, g++ currently ignores namespace <TT>std</TT> for
|
|
|
|
|
backwards compatibility. It can be turned on with the
|
|
|
|
|
<TT> -fhonor-std </TT> flag to the compiler. As of libstdc++-v3
|
|
|
|
|
snapshot 2.90.8, that flag is passed to g++ when building the
|
2000-05-19 21:55:50 +02:00
|
|
|
library. (In g++ 2.96 and later, this flag is on by default if
|
|
|
|
|
libstdc++-v3 is used.) The --disable variant will put all std::
|
|
|
|
|
symbols into the global namespace.
|
2000-04-21 22:33:34 +02:00
|
|
|
</P>
|
|
|
|
|
|
2000-05-19 21:55:50 +02:00
|
|
|
<DT><TT>--enable-cshadow-headers </TT>
|
2000-05-16 19:06:39 +02:00
|
|
|
<DD><P>This turns on the code to construct shadowed C headers. Very
|
|
|
|
|
experimental as of this writing.
|
|
|
|
|
</P>
|
|
|
|
|
|
2000-04-21 22:33:34 +02:00
|
|
|
<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 2.90.8,
|
|
|
|
|
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
|
|
|
|
|
2.90.8, 'single' and 'posix' are the only implemented models.
|
|
|
|
|
</P>
|
|
|
|
|
|
|
|
|
|
<DT><TT>--enable-libgcc-rebuild=DIR / --disable-libgcc-rebuild</TT>
|
|
|
|
|
<DD><P>This is a grueling temporary hack no matter which way you look
|
|
|
|
|
at it. It's described in <A HREF="gccrebuild.html">its own
|
|
|
|
|
little page</A>. Note that other --enable flags will
|
2000-07-07 23:13:28 +02:00
|
|
|
interact with this one. In libstdc++-v3 snapshot 2.90.8,
|
2000-07-11 23:45:08 +02:00
|
|
|
this is enabled by default, with DIR set to
|
|
|
|
|
<TT> '../..' </TT>, so that building the complete GCC sources
|
|
|
|
|
with libstdc++-v3 in place works transparently. Since then,
|
|
|
|
|
library sources have been merged into the compiler sources,
|
|
|
|
|
and this option has been removed.
|
2000-04-21 22:33:34 +02:00
|
|
|
</P>
|
|
|
|
|
|
2000-05-09 22:25:13 +02:00
|
|
|
<DT><TT>--enable-cxx-flags=FLAGS</TT>
|
2000-04-21 22:33:34 +02:00
|
|
|
<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>
|
2000-05-09 22:25:13 +02:00
|
|
|
--enable-cxx-flags='-fsquangle -fvtable-gc -ansi'</PRE>
|
2000-04-21 22:33:34 +02:00
|
|
|
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>
|
2000-05-09 22:25:13 +02:00
|
|
|
<P>The advantage of --enable-cxx-flags over setting CXXFLAGS in
|
2000-04-21 22:33:34 +02:00
|
|
|
the 'make' environment is that, if libgcc is 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
|
|
|
|
|
-fnew-abi
|
|
|
|
|
-fnew-exceptions
|
|
|
|
|
-ffunction-sections
|
|
|
|
|
-fvtable-gc</PRE>
|
|
|
|
|
and -fno- forms of the same. Tell us (the mailing list) if
|
|
|
|
|
you discover more!
|
|
|
|
|
</P>
|
2000-08-28 20:41:24 +02:00
|
|
|
|
|
|
|
|
<DT><TT>--enable-wchar </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.
|
|
|
|
|
</P>
|
2000-04-21 22:33:34 +02:00
|
|
|
</DL>
|
|
|
|
|
</P>
|
2000-07-11 23:45:08 +02:00
|
|
|
<P>Return <A HREF="#top">to the top of the page</A> or
|
2000-04-21 22:33:34 +02:00
|
|
|
<A HREF="index.html">to the homepage</A>.
|
|
|
|
|
</P>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!-- ####################################################### -->
|
|
|
|
|
|
|
|
|
|
<HR>
|
|
|
|
|
<P CLASS="fineprint"><EM>
|
2000-08-28 20:41:24 +02:00
|
|
|
$Id: configopts.html,v 1.7 2000/08/09 07:33:39 bkoz Exp $
|
2000-04-21 22:33:34 +02:00
|
|
|
</EM></P>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</BODY>
|
|
|
|
|
</HTML>
|
