From Fedora Project Wiki
GCC Compiler Collection
This release of Fedora has been built with GCC 4.3.2, which is included with the distribution.
For more information on GCC 4.3, refer to:
Code Generation
Starting with gcc-4.1.2-25
and glibc-2.6.90-14
, the -D_FORTIFY_SOURCE=2
option protects not only C code, but also C++. There have been several security
issues already which would not have been exploitable if this checking was in place earlier. Refer to this announcement for more details.