1 |
424 |
jeremybenn |
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
2 |
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
3 |
|
|
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Configure</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><meta name="keywords" content=" ISO C++ , configure , options " /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="setup.html" title="Chapter 2. Setup" /><link rel="prev" href="setup.html" title="Chapter 2. Setup" /><link rel="next" href="make.html" title="Make" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Configure</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="setup.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Setup</th><td width="20%" align="right"> <a accesskey="n" href="make.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Configure"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.setup.configure"></a>Configure</h2></div></div></div><p>
|
4 |
|
|
When configuring libstdc++, you'll have to configure the entire
|
5 |
|
|
<span class="emphasis"><em>gccsrcdir</em></span> directory. Consider using the
|
6 |
|
|
toplevel gcc configuration option
|
7 |
|
|
<code class="literal">--enable-languages=c++</code>, which saves time by only
|
8 |
|
|
building the C++ toolchain.
|
9 |
|
|
</p><p>
|
10 |
|
|
Here are all of the configure options specific to libstdc++. Keep
|
11 |
|
|
in mind that
|
12 |
|
|
|
13 |
|
|
<a class="ulink" href="http://sourceware.org/autobook/autobook/autobook_14.html" target="_top">they
|
14 |
|
|
all have opposite forms as well</a> (enable/disable and
|
15 |
|
|
with/without). The defaults are for the <span class="emphasis"><em>current
|
16 |
|
|
development sources</em></span>, which may be different than those
|
17 |
|
|
for released versions.
|
18 |
|
|
</p><p>The canonical way to find out the configure options that are
|
19 |
|
|
available for a given set of libstdc++ sources is to go to the
|
20 |
|
|
source directory and then type:<span class="command"><strong>./configure --help</strong></span>.
|
21 |
|
|
</p><div class="variablelist"><dl><dt><span class="term"><code class="code">--enable-multilib</code>[default]</span></dt><dd><p>This is part of the generic multilib support for building cross
|
22 |
|
|
compilers. As such, targets like "powerpc-elf" will have
|
23 |
|
|
libstdc++ built many different ways: "-msoft-float"
|
24 |
|
|
and not, etc. A different libstdc++ will be built for each of
|
25 |
|
|
the different multilib versions. This option is on by default.
|
26 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-sjlj-exceptions</code></span></dt><dd><p>Forces old, set-jump/long-jump exception handling model. If
|
27 |
|
|
at all possible, the new, frame unwinding exception handling routines
|
28 |
|
|
should be used instead, as they significantly reduce both
|
29 |
|
|
runtime memory usage and executable size. This option can
|
30 |
|
|
change the library ABI.
|
31 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-version-specific-runtime-libs</code></span></dt><dd><p>Specify that run-time libraries should be installed in the
|
32 |
|
|
compiler-specific subdirectory (i.e.,
|
33 |
|
|
<code class="code">${libdir}/gcc-lib/${target_alias}/${gcc_version}</code>)
|
34 |
|
|
instead of <code class="code">${libdir}</code>. This option is useful if you
|
35 |
|
|
intend to use several versions of gcc in parallel. In addition,
|
36 |
|
|
libstdc++'s include files will be installed in
|
37 |
|
|
<code class="code">${libdir}/gcc-lib/${target_alias}/${gcc_version}/include/g++</code>,
|
38 |
|
|
unless you also specify
|
39 |
|
|
<code class="literal">--with-gxx-include-dir=<code class="filename">dirname</code></code> during configuration.
|
40 |
|
|
</p></dd><dt><span class="term"><code class="code">--with-gxx-include-dir=<include-files dir></code></span></dt><dd><p>Adds support for named libstdc++ include directory. For instance,
|
41 |
|
|
the following puts all the libstdc++ headers into a directory
|
42 |
|
|
called "4.4-20090404" instead of the usual
|
43 |
|
|
"c++/(version)".
|
44 |
|
|
</p><pre class="programlisting">
|
45 |
|
|
--with-gxx-include-dir=/foo/H-x86-gcc-3-c-gxx-inc/include/4.4-20090404</pre></dd><dt><span class="term"><code class="code">--enable-cstdio</code></span></dt><dd><p>This is an abbreviated form of <code class="code">'--enable-cstdio=stdio'</code>
|
46 |
|
|
(described next).
|
47 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-cstdio=OPTION</code></span></dt><dd><p>Select a target-specific I/O package. At the moment, the only
|
48 |
|
|
choice is to use 'stdio', a generic "C" abstraction.
|
49 |
|
|
The default is 'stdio'. This option can change the library ABI.
|
50 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-clocale</code></span></dt><dd><p>This is an abbreviated form of <code class="code">'--enable-clocale=generic'</code>
|
51 |
|
|
(described next).
|
52 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-clocale=OPTION</code></span></dt><dd><p>Select a target-specific underlying locale package. The
|
53 |
|
|
choices are 'ieee_1003.1-2001' to specify an X/Open, Standard Unix
|
54 |
|
|
(IEEE Std. 1003.1-2001) model based on langinfo/iconv/catgets,
|
55 |
|
|
'gnu' to specify a model based on functionality from the GNU C
|
56 |
|
|
library (langinfo/iconv/gettext) (from <a class="ulink" href="http://sources.redhat.com/glibc/" target="_top">glibc</a>, the GNU C
|
57 |
|
|
library), or 'generic' to use a generic "C"
|
58 |
|
|
abstraction which consists of "C" locale info.
|
59 |
|
|
</p><p>If not explicitly specified, the configure proccess tries
|
60 |
|
|
to guess the most suitable package from the choices above. The
|
61 |
|
|
default is 'generic'. On glibc-based systems of sufficient
|
62 |
|
|
vintage (2.2.5 and newer) and capability (with installed DE and
|
63 |
|
|
FR locale data), 'gnu' is automatically selected. This option
|
64 |
|
|
can change the library ABI.
|
65 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-allocator</code></span></dt><dd><p>This is an abbreviated form of
|
66 |
|
|
<code class="code">'--enable-libstdcxx-allocator=auto'</code> (described
|
67 |
|
|
next).
|
68 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-allocator=OPTION </code></span></dt><dd><p>Select a target-specific underlying std::allocator. The
|
69 |
|
|
choices are 'new' to specify a wrapper for new, 'malloc' to
|
70 |
|
|
specify a wrapper for malloc, 'mt' for a fixed power of two allocator,
|
71 |
|
|
'pool' for the SGI pooled allocator or 'bitmap' for a bitmap allocator.
|
72 |
|
|
See this page for more information on allocator
|
73 |
|
|
<a class="link" href="memory.html#allocator.ext" title="Extension Allocators">extensions</a>. This option
|
74 |
|
|
can change the library ABI.
|
75 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-cheaders=OPTION</code></span></dt><dd><p>This allows the user to define the approach taken for C header
|
76 |
|
|
compatibility with C++. Options are c, c_std, and c_global.
|
77 |
|
|
These correspond to the source directory's include/c,
|
78 |
|
|
include/c_std, and include/c_global, and may also include
|
79 |
|
|
include/c_compatibility. The default is 'c_global'.
|
80 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-threads</code></span></dt><dd><p>This is an abbreviated form of <code class="code">'--enable-threads=yes'</code>
|
81 |
|
|
(described next).
|
82 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-threads=OPTION</code></span></dt><dd><p>Select a threading library. A full description is
|
83 |
|
|
given in the
|
84 |
|
|
general <a class="ulink" href="http://gcc.gnu.org/install/configure.html" target="_top">compiler
|
85 |
|
|
configuration instructions</a>. This option can change the
|
86 |
|
|
library ABI.
|
87 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-debug</code></span></dt><dd><p>Build separate debug libraries in addition to what is normally built.
|
88 |
|
|
By default, the debug libraries are compiled with
|
89 |
|
|
<code class="code"> CXXFLAGS='-g3 -O0 -fno-inline'</code>
|
90 |
|
|
, are installed in <code class="code">${libdir}/debug</code>, and have the
|
91 |
|
|
same names and versioning information as the non-debug
|
92 |
|
|
libraries. This option is off by default.
|
93 |
|
|
</p><p>Note this make command, executed in
|
94 |
|
|
the build directory, will do much the same thing, without the
|
95 |
|
|
configuration difference and without building everything twice:
|
96 |
|
|
<code class="code">make CXXFLAGS='-g3 -O0 -fno-inline' all</code>
|
97 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-debug-flags=FLAGS</code></span></dt><dd><p>This option is only valid when <code class="code"> --enable-debug </code>
|
98 |
|
|
is also specified, and applies to the debug builds only. With
|
99 |
|
|
this option, you can pass a specific string of flags to the
|
100 |
|
|
compiler to use when building the debug versions of libstdc++.
|
101 |
|
|
FLAGS is a quoted string of options, like
|
102 |
|
|
</p><pre class="programlisting">
|
103 |
|
|
--enable-libstdcxx-debug-flags='-g3 -O1 -fno-inline'</pre></dd><dt><span class="term"><code class="code">--enable-cxx-flags=FLAGS</code></span></dt><dd><p>With this option, you can pass a string of -f (functionality)
|
104 |
|
|
flags to the compiler to use when building libstdc++. This
|
105 |
|
|
option can change the library ABI. FLAGS is a quoted string of
|
106 |
|
|
options, like
|
107 |
|
|
</p><pre class="programlisting">
|
108 |
|
|
--enable-cxx-flags='-fvtable-gc -fomit-frame-pointer -ansi'</pre><p>
|
109 |
|
|
Note that the flags don't necessarily have to all be -f flags,
|
110 |
|
|
as shown, but usually those are the ones that will make sense
|
111 |
|
|
for experimentation and configure-time overriding.
|
112 |
|
|
</p><p>The advantage of --enable-cxx-flags over setting CXXFLAGS in
|
113 |
|
|
the 'make' environment is that, if files are automatically
|
114 |
|
|
rebuilt, the same flags will be used when compiling those files
|
115 |
|
|
as well, so that everything matches.
|
116 |
|
|
</p><p>Fun flags to try might include combinations of
|
117 |
|
|
</p><pre class="programlisting">
|
118 |
|
|
-fstrict-aliasing
|
119 |
|
|
-fno-exceptions
|
120 |
|
|
-ffunction-sections
|
121 |
|
|
-fvtable-gc</pre><p>and opposite forms (-fno-) of the same. Tell us (the libstdc++
|
122 |
|
|
mailing list) if you discover more!
|
123 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-c99</code></span></dt><dd><p>The "long long" type was introduced in C99, along
|
124 |
|
|
with many other functions for wide characters, and math
|
125 |
|
|
classification macros, etc. If enabled, all C99 functions not
|
126 |
|
|
specified by the C++ standard will be put into <code class="code">namespace
|
127 |
|
|
__gnu_cxx</code>, and then all these names will
|
128 |
|
|
be injected into namespace std, so that C99 functions can be
|
129 |
|
|
used "as if" they were in the C++ standard (as they
|
130 |
|
|
will eventually be in some future revision of the standard,
|
131 |
|
|
without a doubt). By default, C99 support is on, assuming the
|
132 |
|
|
configure probes find all the necessary functions and bits
|
133 |
|
|
necessary. This option can change the library ABI.
|
134 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-wchar_t</code>[default]</span></dt><dd><p>Template specializations for the "wchar_t" type are
|
135 |
|
|
required for wide character conversion support. Disabling
|
136 |
|
|
wide character specializations may be expedient for initial
|
137 |
|
|
porting efforts, but builds only a subset of what is required by
|
138 |
|
|
ISO, and is not recommended. By default, this option is on.
|
139 |
|
|
This option can change the library ABI.
|
140 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-long-long </code></span></dt><dd><p>The "long long" type was introduced in C99. It is
|
141 |
|
|
provided as a GNU extension to C++98 in g++. This flag builds
|
142 |
|
|
support for "long long" into the library (specialized
|
143 |
|
|
templates and the like for iostreams). This option is on by default:
|
144 |
|
|
if enabled, users will have to either use the new-style "C"
|
145 |
|
|
headers by default (i.e., <cmath> not <math.h>)
|
146 |
|
|
or add appropriate compile-time flags to all compile lines to
|
147 |
|
|
allow "C" visibility of this feature (on GNU/Linux,
|
148 |
|
|
the flag is -D_ISOC99_SOURCE, which is added automatically via
|
149 |
|
|
CPLUSPLUS_CPP_SPEC's addition of _GNU_SOURCE).
|
150 |
|
|
This option can change the library ABI.
|
151 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-fully-dynamic-string</code></span></dt><dd><p>This option enables a special version of basic_string avoiding
|
152 |
|
|
the optimization that allocates empty objects in static memory.
|
153 |
|
|
Mostly useful together with shared memory allocators, see PR
|
154 |
|
|
libstdc++/16612 for details.
|
155 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-concept-checks</code></span></dt><dd><p>This turns on additional compile-time checks for instantiated
|
156 |
|
|
library templates, in the form of specialized templates,
|
157 |
|
|
<a class="link" href="bk01pt03ch08.html" title="Chapter 8. Concept Checking">described here</a>. They
|
158 |
|
|
can help users discover when they break the rules of the STL, before
|
159 |
|
|
their programs run.
|
160 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-symvers[=style]</code></span></dt><dd><p>In 3.1 and later, tries to turn on symbol versioning in the
|
161 |
|
|
shared library (if a shared library has been
|
162 |
|
|
requested). Values for 'style' that are currently supported
|
163 |
|
|
are 'gnu', 'gnu-versioned-namespace', 'darwin', and
|
164 |
|
|
'darwin-export'. Both gnu- options require that a recent
|
165 |
|
|
version of the GNU linker be in use. Both darwin options are
|
166 |
|
|
equivalent. With no style given, the configure script will try
|
167 |
|
|
to guess correct defaults for the host system, probe to see if
|
168 |
|
|
additional requirements are necessary and present for
|
169 |
|
|
activation, and if so, will turn symbol versioning on. This
|
170 |
|
|
option can change the library ABI.
|
171 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-visibility</code></span></dt><dd><p> In 4.2 and later, enables or disables visibility attributes.
|
172 |
|
|
If enabled (as by default), and the compiler seems capable of
|
173 |
|
|
passing the simple sanity checks thrown at it, adjusts items
|
174 |
|
|
in namespace std, namespace std::tr1, and namespace __gnu_cxx
|
175 |
|
|
so that -fvisibility options work.
|
176 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-pch</code></span></dt><dd><p>In 3.4 and later, tries to turn on the generation of
|
177 |
|
|
stdc++.h.gch, a pre-compiled file including all the standard
|
178 |
|
|
C++ includes. If enabled (as by default), and the compiler
|
179 |
|
|
seems capable of passing the simple sanity checks thrown at
|
180 |
|
|
it, try to build stdc++.h.gch as part of the make process.
|
181 |
|
|
In addition, this generated file is used later on (by appending <code class="code">
|
182 |
|
|
--include bits/stdc++.h </code> to CXXFLAGS) when running the
|
183 |
|
|
testsuite.
|
184 |
|
|
</p></dd><dt><span class="term"><code class="code">--disable-hosted-libstdcxx</code></span></dt><dd><p>
|
185 |
|
|
By default, a complete <span class="emphasis"><em>hosted</em></span> C++ library is
|
186 |
|
|
built. The C++ Standard also describes a
|
187 |
|
|
<span class="emphasis"><em>freestanding</em></span> environment, in which only a
|
188 |
|
|
minimal set of headers are provided. This option builds such an
|
189 |
|
|
environment.
|
190 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-time</code></span></dt><dd><p>This is an abbreviated form of
|
191 |
|
|
<code class="code">'--enable-libstdcxx-time=yes'</code>(described next).
|
192 |
|
|
</p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-time=OPTION</code></span></dt><dd><p>Enables link-type checks for the availability of the
|
193 |
|
|
clock_gettime clocks, used in the implementation of [time.clock],
|
194 |
|
|
and of the nanosleep and sched_yield functions, used in the
|
195 |
|
|
implementation of [thread.thread.this] of the current C++0x draft.
|
196 |
|
|
The choice OPTION=yes checks for the availability of the facilities
|
197 |
|
|
in libc and libposix4. In case of need the latter is also linked
|
198 |
|
|
to libstdc++ as part of the build process. OPTION=rt also searches
|
199 |
|
|
(and, in case, links) librt. Note that the latter is not always
|
200 |
|
|
desirable because, in glibc, for example, in turn it triggers the
|
201 |
|
|
linking of libpthread too, which activates locking, a large overhead
|
202 |
|
|
for single-thread programs. OPTION=no skips the tests completely.
|
203 |
|
|
The default is OPTION=no.
|
204 |
|
|
</p></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="setup.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="setup.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="make.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 2. Setup </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Make</td></tr></table></div></body></html>
|