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re PR libstdc++/51504 (Data race hunting instructions in manual do not work) 

PR libstdc++/51504
	* doc/xml/manual/debug.xml: Suggest using symbol interposition
	to override symbols using annotation macros.

From-SVN: r182943
This commit is contained in:
Jonathan Wakely 2012-01-06 01:26:06 +00:00 committed by Jonathan Wakely
parent ea0463d9d4
commit 6e576613f7
2 changed files with 23 additions and 7 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2012-01-06 Jonathan Wakely <jwakely.gcc@gmail.com>
PR libstdc++/51504
* doc/xml/manual/debug.xml: Suggest using symbol interposition
to override symbols using annotation macros.
2012-01-05 François Dumont <fdumont@gcc.gnu.org>
* include/bits/hashtable_policy.h (_Hashtable_base<>::_M_eq()):

24
libstdc++-v3/doc/xml/manual/debug.xml
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@ -207,14 +207,24 @@
redefining them will only affect inline functions and template
instantiations which are compiled in user code. This allows annotation
of templates such as <code>shared_ptr</code>, but not code which is
only instantiated in the library.
In order to annotate <code>basic_string</code> reference counting it
is necessary to disable extern templates (by defining
<code>_GLIBCXX_EXTERN_TEMPLATE=-1</code>) or to rebuild the
<code>.so</code> file.
only instantiated in the library. Code which is only instantiated in
the library needs to be recompiled with the annotation macros defined.
That can be done by rebuilding the entire
<filename class="libraryfile">libstdc++.so</filename> file but a simpler
alternative exists for ELF platforms such as GNU/Linux, because ELF
symbol interposition allows symbols defined in the shared library to be
overridden by symbols with the same name that appear earlier in the
runtime search path. This means you only need to recompile the functions
that are affected by the annotation macros, which can be done by
recompiling individual files.
Annotating <code>std::string</code> and <code>std::wstring</code>
reference counting can be done by disabling extern templates (by defining
<code>_GLIBCXX_EXTERN_TEMPLATE=-1</code>) or by rebuilding the
<filename>src/string-inst.cc</filename> file.
Annotating the remaining atomic operations (at the time of writing these
are in <code>ios_base::Init::~Init</code>, <code>locale::_Impl</code> and
<code>locale::facet</code>) requires rebuilding the <code>.so</code> file.
are in <code>ios_base::Init::~Init</code>, <code>locale::_Impl</code>,
<code>locale::facet</code> and <code>thread::_M_start_thread</code>)
requires rebuilding the relevant source files.
</para>
<para>