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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.
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| === Obsoleted support and features ===
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| The following ports for individual systems on particular architectures have been obsoleted:
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| * IRIX releases before 6.5 (mips-sgi-irix5*, mips-sgi-irix6.[0-4])
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| * 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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| {{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>.}} | |
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| === Optimizer improvements ===
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| * 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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| * 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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| | {{Docs_beat_closed}} |
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| [[Category:Docs Project]] | | [[Category:Docs Project]] |
| [[Category:Draft documentation]] | | [[Category:Draft documentation]] |
| [[Category:Documentation beats]] | | [[Category:Documentation beats]] |
