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== gcc ==
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Fedora 14 includes version 4.5 of '''gcc''' and the various compilers which depend on gcc.  The full details of the changes may be found at http://gcc.gnu.org/gcc-4.5/changes.html, but some main points follow.
 
  
=== Obsoleted support and features ===
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== GCC ==
  
The following ports for individual systems on particular architectures have been obsoleted:
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As of Fedora 19, GCC 4.8.x is shipped as the default GCC. In addition, all Fedora packages have been rebuilt with GCC 4.8.x (and GLIBC 2.17; see below)
  
* IRIX releases before 6.5 (mips-sgi-irix5*, mips-sgi-irix6.[0-4])
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Users will be able to see compiled code improvements and use the newly added features, such as improved C++11 and C11 support, improved vectorization support, etc.
* Solaris 7 (*-*-solaris2.7)
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* Tru64 UNIX releases before V5.1 (alpha*-dec-osf4*, alpha-dec-osf5.0*)
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* Details for the IRIX, Solaris 7, and Tru64 UNIX obsoletions can be found in the announcement.
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* Support for the classic POWER architecture implemented in the original RIOS and RIOS2 processors of the old IBM RS/6000 product line has been obsoleted in the rs6000 port. This does not affect the new generation Power and PowerPC architectures.
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Support has also been removed for a number of features obsoleted in 4.4.
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For more information on the changes in GCC 4.8.x, please see http://gcc.gnu.org/gcc-4.8/changes.html
  
{{admon/warning|On x86 targets, code containing floating-point calculations may run significantly slower when compiled with GCC 4.5 in strict C99 conformance mode than they did with earlier GCC versions.|This is due to stricter standard conformance of the compiler and can be avoided by using the option <code>-fexcess-precision=fast</code>.}}
 
  
=== Optimizer improvements ===
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== GLIBC ==
  
* The <code>-save-temps</code> now takes an optional argument. The <code>-save-temps</code> and <code>-save-temps=cwd</code> switches write the temporary files in the current working directory based on the original source file. The <code>-save-temps=obj</code> switch will write files into the directory specified with the <code>-o</code> option, and the intermediate filenames are based on the output file.
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As of Fedora 19, GLIBC 2.17 is shipped as the default GLIBC. All Fedora packages have been rebuilt with GLIBC 2.17 (and GCC 4.8.x; see above).
* Debugging dumps are now created in the same directory as the object file rather than in the current working directory.
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* A new link-time optimizer has been added (<code>-flto</code>). When this option is used, GCC generates a bytecode representation of each input file and writes it to special ELF sections in each object file.
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* The automatic parallelization pass was enhanced to support parallelization of outer loops.
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* GCC now optimize exception handling code.
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Reference the changes page above for more details on these and other optimizations.
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=== Language-specific improvements ===
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There are new language-specific features for Ada, C, C++, Fortran and Java.
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=== New targets ===
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There are new target processors within the AIX, ARM, AVR, IA32, M68K, MeP, MIPS, RS/6000 and RX processor families.
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=== Installation Changes ===
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The move to autotools has resulted in some artifacts changing the directories where they are found.  For details, as in all of the above details, refer to the changes page.
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For more information on the changes in GLIBC 2.17, please see http://sourceware.org/ml/libc-announce/2012/msg00001.html
  
 
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[[Category:Draft documentation]]
 
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[[Category:Documentation beats]]

Revision as of 23:32, 30 April 2013

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GCC

As of Fedora 19, GCC 4.8.x is shipped as the default GCC. In addition, all Fedora packages have been rebuilt with GCC 4.8.x (and GLIBC 2.17; see below)

Users will be able to see compiled code improvements and use the newly added features, such as improved C++11 and C11 support, improved vectorization support, etc.

For more information on the changes in GCC 4.8.x, please see http://gcc.gnu.org/gcc-4.8/changes.html


GLIBC

As of Fedora 19, GLIBC 2.17 is shipped as the default GLIBC. All Fedora packages have been rebuilt with GLIBC 2.17 (and GCC 4.8.x; see above).

For more information on the changes in GLIBC 2.17, please see http://sourceware.org/ml/libc-announce/2012/msg00001.html