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== Boost 1.55.0 ==
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'''boost''' has been upgraded to version 1.55.0. This update brings a large number of bug fixes and enhancements, one new library (Predef), and a slight change in requirements as support for very old versions of several compilers has been removed. For a full list of changes, see the [http://www.boost.org/users/history/version_1_55_0.html Boost 1.55.0 Release Notes].
 
{{admon/note|Note|The original plan was to update Boost to version 1.56.0. However, this version was only released on August 7, which was too close to the Fedora 21 Alpha release date.}}
 
== GCC 4.9.x ==
 
The GNU Compiler Collection (GCC) has been upgraded to version 4.9.x, and all Fedora packages have been rebuilt with this new version of GCC.
 
The update provides a large number of bug fixes and enhancements. The notable newly supported features and changes are listed below:
 
* ISO C11 support is largely complete
* partial support for C++14
* C++11 support for regular expressions
* the OpenMP 4.0 standard
* the Undefined Behavior Sanitizer (UBSAN)
* the Cilk Plus extension
 
For detailed information about all changes, see the [https://gcc.gnu.org/gcc-4.9/changes.html GCC 4.9 Release Notes].


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