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Boost 1.55.0

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 Boost 1.55.0 Release Notes.

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 GCC 4.9 Release Notes.