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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Headers</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.77.1" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="using.html" title="Chapter 3. Using" /><link rel="prev" href="using.html" title="Chapter 3. Using" /><link rel="next" href="using_macros.html" title="Macros" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Headers</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="using.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Using</th><td width="20%" align="right"> <a accesskey="n" href="using_macros.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.using.headers"></a>Headers</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.all"></a>Header Files</h3></div></div></div><p>
- The C++ standard specifies the entire set of header files that
- must be available to all hosted implementations. Actually, the
- word "files" is a misnomer, since the contents of the
- headers don't necessarily have to be in any kind of external
- file. The only rule is that when one <code class="code">#include</code>'s a
- header, the contents of that header become available, no matter
- how.
- </p><p>
- That said, in practice files are used.
- </p><p>
- There are two main types of include files: header files related
- to a specific version of the ISO C++ standard (called Standard
- Headers), and all others (TR1, C++ ABI, and Extensions).
- </p><p>
- Two dialects of standard headers are supported, corresponding to
- the 1998 standard as updated for 2003, and the current 2011 standard.
- </p><p>
- C++98/03 include files. These are available in the default compilation mode, i.e. <code class="code">-std=c++98</code> or <code class="code">-std=gnu++98</code>.
- </p><div class="table"><a id="idp13079360"></a><p class="title"><strong>Table 3.2. C++ 1998 Library Headers</strong></p><div class="table-contents"><table summary="C++ 1998 Library Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">algorithm</code></td><td align="left"><code class="filename">bitset</code></td><td align="left"><code class="filename">complex</code></td><td align="left"><code class="filename">deque</code></td><td align="left"><code class="filename">exception</code></td></tr><tr><td align="left"><code class="filename">fstream</code></td><td align="left"><code class="filename">functional</code></td><td align="left"><code class="filename">iomanip</code></td><td align="left"><code class="filename">ios</code></td><td align="left"><code class="filename">iosfwd</code></td></tr><tr><td align="left"><code class="filename">iostream</code></td><td align="left"><code class="filename">istream</code></td><td align="left"><code class="filename">iterator</code></td><td align="left"><code class="filename">limits</code></td><td align="left"><code class="filename">list</code></td></tr><tr><td align="left"><code class="filename">locale</code></td><td align="left"><code class="filename">map</code></td><td align="left"><code class="filename">memory</code></td><td align="left"><code class="filename">new</code></td><td align="left"><code class="filename">numeric</code></td></tr><tr><td align="left"><code class="filename">ostream</code></td><td align="left"><code class="filename">queue</code></td><td align="left"><code class="filename">set</code></td><td align="left"><code class="filename">sstream</code></td><td align="left"><code class="filename">stack</code></td></tr><tr><td align="left"><code class="filename">stdexcept</code></td><td align="left"><code class="filename">streambuf</code></td><td align="left"><code class="filename">string</code></td><td align="left"><code class="filename">utility</code></td><td align="left"><code class="filename">typeinfo</code></td></tr><tr><td align="left"><code class="filename">valarray</code></td><td align="left"><code class="filename">vector</code></td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="idp13115840"></a><p class="title"><strong>Table 3.3. C++ 1998 Library Headers for C Library Facilities</strong></p><div class="table-contents"><table summary="C++ 1998 Library Headers for C Library Facilities" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">cassert</code></td><td align="left"><code class="filename">cerrno</code></td><td align="left"><code class="filename">cctype</code></td><td align="left"><code class="filename">cfloat</code></td><td align="left"><code class="filename">ciso646</code></td></tr><tr><td align="left"><code class="filename">climits</code></td><td align="left"><code class="filename">clocale</code></td><td align="left"><code class="filename">cmath</code></td><td align="left"><code class="filename">csetjmp</code></td><td align="left"><code class="filename">csignal</code></td></tr><tr><td align="left"><code class="filename">cstdarg</code></td><td align="left"><code class="filename">cstddef</code></td><td align="left"><code class="filename">cstdio</code></td><td align="left"><code class="filename">cstdlib</code></td><td align="left"><code class="filename">cstring</code></td></tr><tr><td align="left"><code class="filename">ctime</code></td><td align="left"><code class="filename">cwchar</code></td><td align="left"><code class="filename">cwctype</code></td><td class="auto-generated"> </td><td class="auto-generated"> </td></tr></tbody></table></div></div><br class="table-break" /><p>
-C++11 include files. These are only available in C++11 compilation
-mode, i.e. <code class="literal">-std=c++11</code> or <code class="literal">-std=gnu++11</code>.
-</p><p></p><div class="table"><a id="idp13140576"></a><p class="title"><strong>Table 3.4. C++ 2011 Library Headers</strong></p><div class="table-contents"><table summary="C++ 2011 Library Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">algorithm</code></td><td align="left"><code class="filename">array</code></td><td align="left"><code class="filename">bitset</code></td><td align="left"><code class="filename">chrono</code></td><td align="left"><code class="filename">complex</code></td></tr><tr><td align="left"><code class="filename">condition_variable</code></td><td align="left"><code class="filename">deque</code></td><td align="left"><code class="filename">exception</code></td><td align="left"><code class="filename">forward_list</code></td><td align="left"><code class="filename">fstream</code></td></tr><tr><td align="left"><code class="filename">functional</code></td><td align="left"><code class="filename">future</code></td><td align="left"><code class="filename">initalizer_list</code></td><td align="left"><code class="filename">iomanip</code></td><td align="left"><code class="filename">ios</code></td></tr><tr><td align="left"><code class="filename">iosfwd</code></td><td align="left"><code class="filename">iostream</code></td><td align="left"><code class="filename">istream</code></td><td align="left"><code class="filename">iterator</code></td><td align="left"><code class="filename">limits</code></td></tr><tr><td align="left"><code class="filename">list</code></td><td align="left"><code class="filename">locale</code></td><td align="left"><code class="filename">map</code></td><td align="left"><code class="filename">memory</code></td><td align="left"><code class="filename">mutex</code></td></tr><tr><td align="left"><code class="filename">new</code></td><td align="left"><code class="filename">numeric</code></td><td align="left"><code class="filename">ostream</code></td><td align="left"><code class="filename">queue</code></td><td align="left"><code class="filename">random</code></td></tr><tr><td align="left"><code class="filename">ratio</code></td><td align="left"><code class="filename">regex</code></td><td align="left"><code class="filename">set</code></td><td align="left"><code class="filename">sstream</code></td><td align="left"><code class="filename">stack</code></td></tr><tr><td align="left"><code class="filename">stdexcept</code></td><td align="left"><code class="filename">streambuf</code></td><td align="left"><code class="filename">string</code></td><td align="left"><code class="filename">system_error</code></td><td align="left"><code class="filename">thread</code></td></tr><tr><td align="left"><code class="filename">tuple</code></td><td align="left"><code class="filename">type_traits</code></td><td align="left"><code class="filename">typeinfo</code></td><td align="left"><code class="filename">unordered_map</code></td><td align="left"><code class="filename">unordered_set</code></td></tr><tr><td align="left"><code class="filename">utility</code></td><td align="left"><code class="filename">valarray</code></td><td align="left"><code class="filename">vector</code></td><td class="auto-generated"> </td><td class="auto-generated"> </td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="idp13192016"></a><p class="title"><strong>Table 3.5. C++ 2011 Library Headers for C Library Facilities</strong></p><div class="table-contents"><table summary="C++ 2011 Library Headers for C Library Facilities" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">cassert</code></td><td align="left"><code class="filename">ccomplex</code></td><td align="left"><code class="filename">cctype</code></td><td align="left"><code class="filename">cerrno</code></td><td align="left"><code class="filename">cfenv</code></td></tr><tr><td align="left"><code class="filename">cfloat</code></td><td align="left"><code class="filename">cinttypes</code></td><td align="left"><code class="filename">ciso646</code></td><td align="left"><code class="filename">climits</code></td><td align="left"><code class="filename">clocale</code></td></tr><tr><td align="left"><code class="filename">cmath</code></td><td align="left"><code class="filename">csetjmp</code></td><td align="left"><code class="filename">csignal</code></td><td align="left"><code class="filename">cstdarg</code></td><td align="left"><code class="filename">cstdbool</code></td></tr><tr><td align="left"><code class="filename">cstddef</code></td><td align="left"><code class="filename">cstdint</code></td><td align="left"><code class="filename">cstdlib</code></td><td align="left"><code class="filename">cstdio</code></td><td align="left"><code class="filename">cstring</code></td></tr><tr><td align="left"><code class="filename">ctgmath</code></td><td align="left"><code class="filename">ctime</code></td><td align="left"><code class="filename">cuchar</code></td><td align="left"><code class="filename">cwchar</code></td><td align="left"><code class="filename">cwctype</code></td></tr></tbody></table></div></div><br class="table-break" /><p>
- In addition, TR1 includes as:
-</p><div class="table"><a id="idp13221904"></a><p class="title"><strong>Table 3.6. C++ TR 1 Library Headers</strong></p><div class="table-contents"><table summary="C++ TR 1 Library Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">tr1/array</code></td><td align="left"><code class="filename">tr1/complex</code></td><td align="left"><code class="filename">tr1/memory</code></td><td align="left"><code class="filename">tr1/functional</code></td><td align="left"><code class="filename">tr1/random</code></td></tr><tr><td align="left"><code class="filename">tr1/regex</code></td><td align="left"><code class="filename">tr1/tuple</code></td><td align="left"><code class="filename">tr1/type_traits</code></td><td align="left"><code class="filename">tr1/unordered_map</code></td><td align="left"><code class="filename">tr1/unordered_set</code></td></tr><tr><td align="left"><code class="filename">tr1/utility</code></td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="idp13238832"></a><p class="title"><strong>Table 3.7. C++ TR 1 Library Headers for C Library Facilities</strong></p><div class="table-contents"><table summary="C++ TR 1 Library Headers for C Library Facilities" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">tr1/ccomplex</code></td><td align="left"><code class="filename">tr1/cfenv</code></td><td align="left"><code class="filename">tr1/cfloat</code></td><td align="left"><code class="filename">tr1/cmath</code></td><td align="left"><code class="filename">tr1/cinttypes</code></td></tr><tr><td align="left"><code class="filename">tr1/climits</code></td><td align="left"><code class="filename">tr1/cstdarg</code></td><td align="left"><code class="filename">tr1/cstdbool</code></td><td align="left"><code class="filename">tr1/cstdint</code></td><td align="left"><code class="filename">tr1/cstdio</code></td></tr><tr><td align="left"><code class="filename">tr1/cstdlib</code></td><td align="left"><code class="filename">tr1/ctgmath</code></td><td align="left"><code class="filename">tr1/ctime</code></td><td align="left"><code class="filename">tr1/cwchar</code></td><td align="left"><code class="filename">tr1/cwctype</code></td></tr></tbody></table></div></div><br class="table-break" /><p>Decimal floating-point arithmetic is available if the C++
-compiler supports scalar decimal floating-point types defined via
-<code class="code">__attribute__((mode(SD|DD|LD)))</code>.
-</p><div class="table"><a id="idp13259904"></a><p class="title"><strong>Table 3.8. C++ TR 24733 Decimal Floating-Point Header</strong></p><div class="table-contents"><table summary="C++ TR 24733 Decimal Floating-Point Header" border="1"><colgroup><col align="left" class="c1" /></colgroup><tbody><tr><td align="left"><code class="filename">decimal/decimal</code></td></tr></tbody></table></div></div><br class="table-break" /><p>
- Also included are files for the C++ ABI interface:
-</p><div class="table"><a id="idp13265424"></a><p class="title"><strong>Table 3.9. C++ ABI Headers</strong></p><div class="table-contents"><table summary="C++ ABI Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /></colgroup><tbody><tr><td align="left"><code class="filename">cxxabi.h</code></td><td align="left"><code class="filename">cxxabi_forced.h</code></td></tr></tbody></table></div></div><br class="table-break" /><p>
- And a large variety of extensions.
-</p><div class="table"><a id="idp13271824"></a><p class="title"><strong>Table 3.10. Extension Headers</strong></p><div class="table-contents"><table summary="Extension Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">ext/algorithm</code></td><td align="left"><code class="filename">ext/atomicity.h</code></td><td align="left"><code class="filename">ext/array_allocator.h</code></td><td align="left"><code class="filename">ext/bitmap_allocator.h</code></td><td align="left"><code class="filename">ext/cast.h</code></td></tr><tr><td align="left"><code class="filename">ext/codecvt_specializations.h</code></td><td align="left"><code class="filename">ext/concurrence.h</code></td><td align="left"><code class="filename">ext/debug_allocator.h</code></td><td align="left"><code class="filename">ext/enc_filebuf.h</code></td><td align="left"><code class="filename">ext/extptr_allocator.h</code></td></tr><tr><td align="left"><code class="filename">ext/functional</code></td><td align="left"><code class="filename">ext/iterator</code></td><td align="left"><code class="filename">ext/malloc_allocator.h</code></td><td align="left"><code class="filename">ext/memory</code></td><td align="left"><code class="filename">ext/mt_allocator.h</code></td></tr><tr><td align="left"><code class="filename">ext/new_allocator.h</code></td><td align="left"><code class="filename">ext/numeric</code></td><td align="left"><code class="filename">ext/numeric_traits.h</code></td><td align="left"><code class="filename">ext/pb_ds/assoc_container.h</code></td><td align="left"><code class="filename">ext/pb_ds/priority_queue.h</code></td></tr><tr><td align="left"><code class="filename">ext/pod_char_traits.h</code></td><td align="left"><code class="filename">ext/pool_allocator.h</code></td><td align="left"><code class="filename">ext/rb_tree</code></td><td align="left"><code class="filename">ext/rope</code></td><td align="left"><code class="filename">ext/slist</code></td></tr><tr><td align="left"><code class="filename">ext/stdio_filebuf.h</code></td><td align="left"><code class="filename">ext/stdio_sync_filebuf.h</code></td><td align="left"><code class="filename">ext/throw_allocator.h</code></td><td align="left"><code class="filename">ext/typelist.h</code></td><td align="left"><code class="filename">ext/type_traits.h</code></td></tr><tr><td align="left"><code class="filename">ext/vstring.h</code></td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="idp13307552"></a><p class="title"><strong>Table 3.11. Extension Debug Headers</strong></p><div class="table-contents"><table summary="Extension Debug Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /><col align="left" class="c5" /></colgroup><tbody><tr><td align="left"><code class="filename">debug/bitset</code></td><td align="left"><code class="filename">debug/deque</code></td><td align="left"><code class="filename">debug/list</code></td><td align="left"><code class="filename">debug/map</code></td><td align="left"><code class="filename">debug/set</code></td></tr><tr><td align="left"><code class="filename">debug/string</code></td><td align="left"><code class="filename">debug/unordered_map</code></td><td align="left"><code class="filename">debug/unordered_set</code></td><td align="left"><code class="filename">debug/vector</code></td><td class="auto-generated"> </td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="idp13322320"></a><p class="title"><strong>Table 3.12. Extension Profile Headers</strong></p><div class="table-contents"><table summary="Extension Profile Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /><col align="left" class="c3" /><col align="left" class="c4" /></colgroup><tbody><tr><td align="left"><code class="filename">profile/bitset</code></td><td align="left"><code class="filename">profile/deque</code></td><td align="left"><code class="filename">profile/list</code></td><td align="left"><code class="filename">profile/map</code></td></tr><tr><td align="left"><code class="filename">profile/set</code></td><td align="left"><code class="filename">profile/unordered_map</code></td><td align="left"><code class="filename">profile/unordered_set</code></td><td align="left"><code class="filename">profile/vector</code></td></tr></tbody></table></div></div><br class="table-break" /><p></p><div class="table"><a id="idp13335696"></a><p class="title"><strong>Table 3.13. Extension Parallel Headers</strong></p><div class="table-contents"><table summary="Extension Parallel Headers" border="1"><colgroup><col align="left" class="c1" /><col align="left" class="c2" /></colgroup><tbody><tr><td align="left"><code class="filename">parallel/algorithm</code></td><td align="left"><code class="filename">parallel/numeric</code></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.mixing"></a>Mixing Headers</h3></div></div></div><p> A few simple rules.
-</p><p>First, mixing different dialects of the standard headers is not
-possible. It's an all-or-nothing affair. Thus, code like
-</p><pre class="programlisting">
-#include &lt;array&gt;
-#include &lt;functional&gt;
-</pre><p>Implies C++11 mode. To use the entities in &lt;array&gt;, the C++11
-compilation mode must be used, which implies the C++11 functionality
-(and deprecations) in &lt;functional&gt; will be present.
-</p><p>Second, the other headers can be included with either dialect of
-the standard headers, although features and types specific to C++11
-are still only enabled when in C++11 compilation mode. So, to use
-rvalue references with <code class="code">__gnu_cxx::vstring</code>, or to use the
-debug-mode versions of <code class="code">std::unordered_map</code>, one must use
-the <code class="code">std=gnu++11</code> compiler flag. (Or <code class="code">std=c++11</code>, of course.)
-</p><p>A special case of the second rule is the mixing of TR1 and C++11
-facilities. It is possible (although not especially prudent) to
-include both the TR1 version and the C++11 version of header in the
-same translation unit:
-</p><pre class="programlisting">
-#include &lt;tr1/type_traits&gt;
-#include &lt;type_traits&gt;
-</pre><p> Several parts of C++11 diverge quite substantially from TR1 predecessors.
-</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.cheaders"></a>The C Headers and <code class="code">namespace std</code></h3></div></div></div><p>
- The standard specifies that if one includes the C-style header
- (&lt;math.h&gt; in this case), the symbols will be available
- in the global namespace and perhaps in
- namespace <code class="code">std::</code> (but this is no longer a firm
- requirement.) On the other hand, including the C++-style
- header (&lt;cmath&gt;) guarantees that the entities will be
- found in namespace std and perhaps in the global namespace.
- </p><p>
-Usage of C++-style headers is recommended, as then
-C-linkage names can be disambiguated by explicit qualification, such
-as by <code class="code">std::abort</code>. In addition, the C++-style headers can
-use function overloading to provide a simpler interface to certain
-families of C-functions. For instance in &lt;cmath&gt;, the
-function <code class="code">std::sin</code> has overloads for all the builtin
-floating-point types. This means that <code class="code">std::sin</code> can be
-used uniformly, instead of a combination
-of <code class="code">std::sinf</code>, <code class="code">std::sin</code>,
-and <code class="code">std::sinl</code>.
-</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="manual.intro.using.headers.pre"></a>Precompiled Headers</h3></div></div></div><p>There are three base header files that are provided. They can be
-used to precompile the standard headers and extensions into binary
-files that may the be used to speed compiles that use these headers.
-</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>stdc++.h</p><p>Includes all standard headers. Actual content varies depending on
-language dialect.
-</p></li><li class="listitem"><p>stdtr1c++.h</p><p>Includes all of &lt;stdc++.h&gt;, and adds all the TR1 headers.
-</p></li><li class="listitem"><p>extc++.h</p><p>Includes all of &lt;stdtr1c++.h&gt;, and adds all the Extension headers.
-</p></li></ul></div><p>How to construct a .gch file from one of these base header files.</p><p>First, find the include directory for the compiler. One way to do
-this is:</p><pre class="programlisting">
-g++ -v hello.cc
-
-#include &lt;...&gt; search starts here:
- /mnt/share/bld/H-x86-gcc.20071201/include/c++/4.3.0
-...
-End of search list.
-</pre><p>Then, create a precompiled header file with the same flags that
-will be used to compile other projects.</p><pre class="programlisting">
-g++ -Winvalid-pch -x c++-header -g -O2 -o ./stdc++.h.gch /mnt/share/bld/H-x86-gcc.20071201/include/c++/4.3.0/x86_64-unknown-linux-gnu/bits/stdc++.h
-</pre><p>The resulting file will be quite large: the current size is around
-thirty megabytes. </p><p>How to use the resulting file.</p><pre class="programlisting">
-g++ -I. -include stdc++.h -H -g -O2 hello.cc
-</pre><p>Verification that the PCH file is being used is easy:</p><pre class="programlisting">
-g++ -Winvalid-pch -I. -include stdc++.h -H -g -O2 hello.cc -o test.exe
-! ./stdc++.h.gch
-. /mnt/share/bld/H-x86-gcc.20071201/include/c++/4.3.0/iostream
-. /mnt/share/bld/H-x86-gcc.20071201include/c++/4.3.0/string
-</pre><p>The exclamation point to the left of the <code class="code">stdc++.h.gch</code> listing means that the generated PCH file was used.</p><p></p><p> Detailed information about creating precompiled header files can be found in the GCC <a class="link" href="http://gcc.gnu.org/onlinedocs/gcc/Precompiled-Headers.html" target="_top">documentation</a>.
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